Resolved Caveats—Cisco IOS Release 12.0(29)S1 Resolved Caveats—Cisco IOS Release 12.0(29)S1 Cisco IOS Release 12.0(29)S1 is a rebuild of Cisco IOS Release 12.0(29)S. The caveats listed in this section are resolved in Cisco IOS Release 12.0(29)S1 but may be open in previous Cisco IOS releases. This section describes only severity 1 and 2 caveats.
Resolved Caveats—Cisco IOS Release 12.0(29)S1 Conditions: This symptom is observed when the Cisco 10720 functions in a broadcast ARP storm environment and when the length argument of the hold queue length in interface configuration command is not the default of 75 packets for any interface of the router (for example, the length argument is 2048).
Resolved Caveats—Cisco IOS Release 12.0(29)S TCP/IP Host-Mode Services • CSCed78149 A document that describes how the Internet Control Message Protocol (ICMP) could be used to perform a number of Denial of Service (DoS) attacks against the Transmission Control Protocol (TCP) has been made publicly available. This document has been published through the Internet Engineering Task Force (IETF) Internet Draft process, and is entitled “ICMP Attacks Against TCP” (draft-gont-tcpm-icmp-attacks-03.txt).
Resolved Caveats—Cisco IOS Release 12.0(29)S • CSCea21328 Symptoms: After a Versatile Interface Processor (VIP) has reloaded, there does not seem to be a crashinfo file because the crashinfo file is not closed; therefore, it is not visible or accessible. If the same VIP reloads again, both the first and second crashinfo files are accessible. Conditions: This symptom is observed on a Cisco 7500 series that is running Cisco IOS Release 12.2(6f). The symptom may also occur in other releases.
Resolved Caveats—Cisco IOS Release 12.0(29)S Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.3(5a) but may also occur in other releases. This symptom is not observed in Release 12.1(8c). Workaround: There is no workaround. • CSCed86286 Symptoms: A router may reload due to a software-forced crash. Conditions: This symptom is observed on a Cisco 3745 that runs Cisco IOS Release 12.2(13)T5 and that has SSH configured.
Resolved Caveats—Cisco IOS Release 12.0(29)S snmp-server community public1 view NOMEMPOOL ro 6 snmp-server community public2 view NOMEMPOOL ro 7 snmp-server community public3 view NOMEMPOOL ro 8 The specific MIB that is being blocked is the ciscoEnhancedMemPoolMIB MIB (1.3.6.1.4.1.9.9.221). Once the configuration is in place, the router must be reloaded to clear the IPC cache and free the memory. • CSCee60844 Symptoms: A software-forced crash may occur on a Cisco 7500 series.
Resolved Caveats—Cisco IOS Release 12.0(29)S Workaround: Do not enter the show running-config command. Rather, enter the show config command. Further Problem Description: The show tech-support command also has a problem when it reaches the show running-config command part. Changing the term length does not work as workaround. Interfaces and Bridging • CSCed75174 Symptoms: A router may not forward VLAN traffic. Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(29)S Conditions: This symptom is observed when you reload a Cisco platform and when the interfaces were in the up/up state before you reloaded the platform. Workaround: Enter the shutdown command followed by the no shutdown command on the controller of either the T3 line card or port adapter on the Cisco platform or on the T3 line card or port adapter on the platform at the remote end.
Resolved Caveats—Cisco IOS Release 12.0(29)S – Enter the ip proxy-arp command on the remote side of the Fast Ethernet link. – Use an OSPF route instead of a default static route. • CSCed57403 Symptoms: When a Cisco router is a midpoint of a TE tunnel and the tunnel headend is a third- party vendor router, the Cisco router may crash.
Resolved Caveats—Cisco IOS Release 12.0(29)S Workaround: There is no workaround. • CSCee11274 Symptoms: BGP may fail to reestablish a session when you remove a line card, PA, VIP, or module and replace it with a card of a different type. For example, the problem occurs when you remove a 1-port GE line card and replace it with a 3-port GE line card.
Resolved Caveats—Cisco IOS Release 12.0(29)S 2. The ABRs are generating summary LSAs, on behalf of the Area X’s two or more intra-area routes, into the backbone area and other areas. The two intra-area routes must be advertised as stub links from two different routers; i.e., one from ABR X, and the other from another router belonging to Area X. 3. The summary LSA IDs for the intra-area routes above, when ORed with the host bits of the corresponding masks, yield identical LSA IDs. For example, 10.10.10.
Resolved Caveats—Cisco IOS Release 12.0(29)S Conditions: This symptom is observed when you enter this command while OSPF is processing an SSO switchover. Workaround: Enter the clear ip ospf redistribution command. • CSCee59315 Symptoms: A BGP VPNv4 table may contain paths that may be imported from deleted BGP table entries or from table entries that have a different prefix from the importing prefix. An example of a path from a deleted BGP table entry is as follows: Router# sh ip bgp v v vpn2 192.168.0.
Resolved Caveats—Cisco IOS Release 12.0(29)S • CSCee63825 Symptoms: When BGP receives an update with only a VPN label change, BGP may not update the TFIB with the new label information. Conditions: This symptom is observed when BGP receives an update with only a VPN label change but without any nexthop changes. When the symptom occurs, enter the clear ip route vrf vrf-name command to return to proper operation. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(29)S Cisco has made free software available to address this problem. For more details, please refer to this advisory, available at http://www.cisco.com/warp/public/707/cisco-sa-20050126-bgp.shtml • CSCee74110 Symptoms: An RP may crash during the BGP router process after BGP flaps several times. Conditions: This symptom is observed on a Cisco 12000 series that runs the gsr-p-mz image of a Cisco IOS interim Release of Release 12.0(29)S.
Resolved Caveats—Cisco IOS Release 12.0(29)S • CSCin65241 Symptoms: ISIS redistribute commands are not synced to the standby RP. The routes dependent on these commands will fail after switchover. Conditions: This symptom is observed on a Cisco 7500 series router. Workaround: There is no workaround. ISO CLNS • CSCee54672 Symptoms: The redistribution of routes from L1 into L2 or/and from L2 into L1 may not occur properly, and a learned IS-IS prefix may be missing.
Resolved Caveats—Cisco IOS Release 12.0(29)S Workaround: There is no workaround. • CSCea28043 Symptoms: IP commands that are sent in the Cisco Networking Services (CNS) config-changed event output may contain an extra ip prefix. Conditions: This symptom is observed on a Cisco router when you enter both ip global configuration commands and the cns config notify diff global configuration command to capture commands that change configuration for the config-changed event output.
Resolved Caveats—Cisco IOS Release 12.0(29)S Workaround 1: There is no workaround if only the changes in the configuration are expected in the CNS configuration notify changed message. Alternate Workaround 1: Specify the all option for the cns config notify global configuration command. 2. Symptom 2: Once the cns config notify global configuration command is configured, the router may not detect a newly created interface.
Resolved Caveats—Cisco IOS Release 12.0(29)S • CSCed63357 This caveat consists, of six separate symptoms, conditions, and workaround, of which the first three apply to all Cisco IOS releases and the last three apply only to Cisco IOS Release 12.3 T: 1) Symptoms: There are three symptoms: – There may be a inconsistent or duplicate display of files between the show diskslot-number and dir diskslot-number commands.
Resolved Caveats—Cisco IOS Release 12.0(29)S Conditions: This symptom is observed on a router that runs Cisco IOS Release 12.3 T when an application or a CLI command overwrites a file on the disk. Workaround: Reload the router. 6) Symptoms: A router that runs Cisco IOS Release 12.3 T crashes. Conditions: This symptom is observed when an application creates or opens a file without the “O_TRUNC” mode and attempts to delete the file, as in the following example: show version | append disk0:redirect.
Resolved Caveats—Cisco IOS Release 12.0(29)S Workaround: There is no workaround. • CSCed79634 Symptoms: The percent-to-bps conversion for the police cir percent command that is configured in a second- and third-level policy may not function properly.
Resolved Caveats—Cisco IOS Release 12.0(29)S • CSCed92837 Symptoms: After a Stateful Switchover (SSO) occurs on a Cisco 7500 series, the standby Route Switch Processor (RSP) my hang just before downloading the image. This situation may prevent the router from entering the STANDBY-HOT state and from being capable to perform a switchover until the standby RSP is reset. Conditions: This symptom is observed on Cisco 7500 series that runs Cisco IOS Release 12.0 S or 12.
Resolved Caveats—Cisco IOS Release 12.0(29)S Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.0 S when the interface has the rate-limit output command enabled. Workaround: There is no workaround. • CSCee06228 Symptoms: The SRP protocol on a Cisco uBR7246VXR may not fully initialize during the boot sequence. Conditions: This symptom is observed on a Cisco uBR7246VXR running Cisco IOS Release 12.2(15)BC1b when one SRP side is wrapped.
Resolved Caveats—Cisco IOS Release 12.0(29)S Conditions: This symptom is observed on a Cisco platform that runs Cisco IOS Release 12.2(20)S2 or Release 12.3 under the following conditions: – A service policy (“A”) is attached to an ATM PVC. – Policy-map “A” is renamed to “B”. – Service policy “B” is attached to the ATM PVC. Workaround: First detach the service policy from the PVC, then rename it and attach it again.
Resolved Caveats—Cisco IOS Release 12.0(29)S Workaround: Either remove dCEF or remove LFI. (A combination of CEF and MLP is not supported.) Note that if there are two member links in the interleaving-enabled MLP bundle, the problem does not occur. • CSCee22045 Symptoms: A “MSC200_MP-4-PAUSE” traceback may occur in large Frame Relay FRF.12 configurations. Conditions: This symptom is observed on a Cisco Catalyst 6000 series, Cisco 7500 series, and Cisco 7600 series. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(29)S Conditions: This symptom is observed during AToM HDLC/PPP regression tests. Workaround: There is no workaround. • CSCee31618 Symptoms: Buffer leakage could occur when a high load of traffic is sent to an interface that has a service policy enabled. This could result in ping failures or very long packet delay.
Resolved Caveats—Cisco IOS Release 12.0(29)S Workaround: First, ping from CE router 2 to CE router 1. Then, ping from CE router 1 to CE router 2. • CSCee36050 Symptoms: A VIP crashes with the following error message: VIP-3-SYSTEM_EXCEPTION: VIP System Exception occurred sig=10, code=0x10 Conditions: This symptom is observed on a Cisco 7500 series when you re-use a channel group (or subinterface) that was previously configured with a Frame Relay DLCI “set” service policy.
Resolved Caveats—Cisco IOS Release 12.0(29)S Workaround: After the symptom has occurred, readd the sequence number configuration to the PVC. • CSCee43569 Symptoms: The TE DB on a tunnel headend may become corrupted. Conditions: This symptom is observed on a Cisco router that has MPLS configured. Workaround: There is no workaround. • CSCee43855 Symptoms: Starting with Cisco IOS Release 12.0(26)S, the Cisco 10720 router supports the IPv6 ACL feature.
Resolved Caveats—Cisco IOS Release 12.0(29)S • CSCee58083 Symptoms: A Cisco router that runs a Cisco IOS interim release for Cisco 12.0(29)S or interim Release 12.3(9.3) or 12.3(9.
Resolved Caveats—Cisco IOS Release 12.0(29)S Conditions: This symptom is observed when a dual SRP ring is configured on three routers that run Cisco IOS Release 12.2S. The symptom may also occur in other releases. Workaround: There is no workaround. • CSCee70024 Symptoms: LSP-Ping packets may include a Vendor Enterprise Code TLV Type 5 with a length that is greater than 4 and with Vendor Private Extensions. According to the draft-ietf-mpls-lsp-ping-05.
Resolved Caveats—Cisco IOS Release 12.0(29)S • CSCee76167 Symptoms: Several spurious memory accesses occur with ATM PVCs, and an error message and traceback similar to the following one may be generated: %ALIGN-3-SPURIOUS: Spurious memory access made at 0x601B5190 reading 0x74 %ALIGN-3-TRACE: -Traceback= 601B5190 601B7B20 601B69D4 60176F64 6017776C 6017755C 6055508C 60555EA0 Conditions: This symptom is observed when you create ATM PVCs or when you enter the clear interface atm or show atm vc command.
Resolved Caveats—Cisco IOS Release 12.0(29)S • CSCef20996 Symptoms: An SNMP query on cbQosREDClassCfg objects may take up a very large part of the CPU utilization of a router. Depending on the overall CPU utilization and query frequency, some side effects such as CPU hogs may occur. Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.0 S. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(29)S – In the output of the show hard pxf cpu statistics interface srp 1/1 detail command, the “destination unreachable” counter increases. – In the output of the show hard pxf cpu statistics interface srp 1/1 detail command, the “zero encap length” counter increases. Conditions: This symptom is observed when all of the following conditions are present: – A packet enters with or without an MPLS label.
Resolved Caveats—Cisco IOS Release 12.0(29)S • CSCin73703 Symptoms: A router may crash when you enter the set fr-fecn-becn command. Conditions: This symptom is observed when you enter the set fr-fecn-becn command for an unsupported interface (that is, a non-Frame Relay interface). Workaround: There is no workaround. • CSCin74920 Symptoms: A spurious memory access may occur when a VC class with OAM parameters is created.
Resolved Caveats—Cisco IOS Release 12.0(29)S Wide-Area Networking • CSCdx84284 Symptoms: A router may not recognize some inbound Multiprotocol Label Switching (MPLS)-tagged packets that are sent via Frame Relay. Because the router cannot recognize the inbound MPLS-tagged packets, MPLS cannot switch those packets to the outgoing interface. The MPLS-tagged packets are dropped by the router, and the router does not increment the input-packet counter in the output of the show frame pvc output EXEC command.
Resolved Caveats—Cisco IOS Release 12.0(29)S Workaround: Remove the Frame Relay encapsulation before you delete the channel group. • CSCee53018 Symptoms: When you enter the show frame-relay lmi command on a router, the router may crash, or alignment errors may occur. Conditions: This symptom is observed after you first have deleted an MFR interface on the router. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 Resolved Caveats—Cisco IOS Release 12.0(28)S6 Cisco IOS Release 12.0(28)S6 is a rebuild of Cisco IOS Release 12.0(28)S. The caveats listed in this section are resolved in Cisco IOS Release 12.0(28)S6 but may be open in previous Cisco IOS releases. This section describes only severity 1, severity 2, and select severity 3 caveats.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 • CSCeg49796 Symptoms: Commands on a router may be unexpectedly removed from the running configuration. Conditions: This symptom is observed on a router that is assigned as a neighbor to a BGP peer group. For example, when the shutdown command was previously configured on the router, the command is removed from the running configuration after the router is assigned as a neighbor to a BGP peer group. Workaround: Re-enter the commands on the router.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 Conditions: This symptom is observed when you configure OSPF with at least one network, and then unconfigure it. Workaround: There is no workaround. ISO CLNS • CSCei58655 Symptoms: A route that fails remains in the routing table with its old metric, preventing an alternate route from being used and causing a routing loop.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 • CSCee22454 Symptoms: If a packet comes in through an interface on which RPF is enabled and the RPF check lookup results in a default prefix which has the Leaf NULL bit set, the packet is dropped even though the Leaf pointers are valid. You can see the RPF drops by entering the show hardware pxf interface interface-number detail | inc RPF command.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 Conditions: This symptom is observed on a Cisco platform that is configured for IPv6 when there are more than eight paths for one IPv6 prefix. The symptom is platform-independent and not release-specific. Workaround: There is no workaround. • CSCeh50638 Symptoms: A 4-port Gigabit Ethernet ISE line card may crash. Conditions: This symptom is observed on a Cisco 12000 series that is configured for multicast traffic. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 Conditions: This symptom is observed when you reload a Cisco router that functions as a PE router and that is configured for MVPN. Workaround: There is no workaround. • CSCei35132 Symptoms: When a link failure occurs between two provider (P) routers, the LSP that is protected via Fast Reroute (FRR) for a primary tunnel and the directed LDP session within the tunnel are fast-rerouted onto an assigned backup tunnel.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 • CSCei52380 Symptoms: The entry for a tunnel is missing from the mplsOutSegmentTopLabel column of the MPLS-LSR-MIB. Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.4 when a mibwalk is performed on the mplsOutSegmentTopLabel object. The symptom may also occur in other releases. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 Conditions: This symptom is observed when the Engine 6 interface forwards these packets as IP packets even though there is a labeled path to the BGP next hop. The output of the show cef command shows that the router uses the MPLS labeled path but the Engine 6 hardware is programmed to forward the packets as IP packets instead of MPLS packets. The next router that receives these IP packets may drop them because the next router may be unaware of the iBGP route.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 Workaround: There is no workaround. • CSCej04738 Symptoms: After you have reloaded the router, an input service policy on an interface of a 1-port channelized OC-12 ISE line card that is configured for MLP may become stuck in the suspended mode. Conditions: This symptom is observed on a Cisco 12416 that runs Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 • CSCej22910 Symptoms: Multicast traffic does not reach a CE router that is connected via static IGMP joins to a PE router. Conditions: This symptom is observed when the following conditions are present: – Traffic from the PE router that performs encapsulation flows towards the CE router.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 • CSCej69557 Symptoms: After you reload a PE router that functions in an MVPN topology and that is configured for sparse mode and Auto-RP, the router may not learn the Auto-RP that is advertised by both a local and remote CE router, preventing traffic from resuming to flow. Conditions: This symptom is observed on a Cisco 12000 series that runs an interim release for Cisco IOS Release 12.0(32)S and that functions as a PE router.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 • CSCin96590 Symptoms: A VIP crashes at the “free_wred_stats” function during an RPR+ switchover. Conditions: This symptom is observed on a Cisco router that is configured with a VIP that has a configuration with about 12 MLP bundles with two T1 members when QoS is applied while traffic is flowing. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 • CSCsb07807 Symptoms: A Cisco 10000 series unexpectedly drops some traffic after you have entered the no service-policy policy-name policy class-configuration command.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 Conditions: This symptom is observed on a Cisco platform when an SSO switchover occurs. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S6 • CSCsb62041 Symptoms: A newly created channelized interface may show packet and byte counts before any traffic passes through the interface. Conditions: This symptom is observed on a Cisco 12000 series. When a channelized interface is deleted, the interface index is released. This interface index may be re-allocated when a new channelized interface is created.
Resolved Caveats—Cisco IOS Release 12.0(28)S5 %MCC192-3-CPUIF_ERR: Packet Exceeds Programmed Length. %GSR-3-INTPROC: Process Traceback= 40D32E5C 406D8CE0 ... Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(28)S2. Workaround: There is no workaround. • CSCuk45823 Symptoms: A reload occurs during high-load IPv6 multicast forwarding. This is due to a corrupted redzone in the packet memory.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 • CSCei61732 Cisco IOS may permit arbitrary code execution after exploitation of a heap-based buffer overflow vulnerability. Cisco has included additional integrity checks in its software, as further described below, that are intended to reduce the likelihood of arbitrary code execution. Cisco has made free software available that includes the additional integrity checks for affected customers. This advisory is posted at http://www.cisco.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 • CSCee83917 Symptoms: The RP of a Cisco router may crash when entering the write memory legacy command. Conditions: This symptom is observed on a Cisco router that has the snmp mib community-map command enabled with a very long community string and an engineID. The symptom may also occur when the long community string is removed from the configuration. The symptom does not occur when entering the copy running-config startup-config EXEC command.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 Workaround: Enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the ATM interface of the PA-A3 port adapter. • CSCsa87986 Symptoms: A router may intermittently transmit corrupt PPP packets. When you enter the debug ppp nego and debug ppp errors commands, it appears that “protocol reject” packets are received from the remote end.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 BGP is only able to converge for a few seconds before new updates arrive, old BGP network entries are not cleaned up, causing the MP-BGP network entries counter to increase above the real number of reachable networks. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 Miscellaneous • CSCdw76832 Symptoms: Some features may not be applied automatically to MLP or MFR interfaces. Also, in complex scaled configurations, CPU hogs may occur on a line card during activation or provisioning of the interfaces. Conditions: These symptoms are observed on a Cisco 12000 series that runs Cisco IOS Release 12.0S and this is configured with a with a 1-port channelized OC-12 (DS1) ISE line card. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 • CSCee56252 Symptoms: An Engine 3 or Engine 5 line card may pause indefinitely when an IPv6 ACL that is configured for security and classification on the line card is modified while being used. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(28)S when the ACL is configured on two or more interfaces of the line card and when IPv6 QoS is configured on these interfaces.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 Conditions: This symptom is observed on a Cisco 10000 series when two PREs are forced to switchover back and forth. Workaround: Enter the snmp-server ifindex persist command. • CSCef70328 Symptoms: A VPN traceroute is broken, and packets are dropped from a router on which a port channel is configured as the default route.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 Conditions: This symptom is observed on a Cisco 12000 series that runs the boot loader image of Cisco IOS Release 12.0(30)S. Workaround: There is no workaround. • CSCeg82322 Symptoms: Platform independent multicast protocol software running in a line card will exit without logging any errors when detecting an illegal value for an input “hardware” interface if_index or an input “software” interface if_number.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 • CSCeh20156 Symptoms: When the working link flaps with two to three second intervals on CHOC12 Internet Services Engine (ISE) line cards that are configured for automatic protection switching (APS), some T1 links may remain down. Conditions: This symptom is observed on a Cisco 12000 series. Workaround: Reload he line card(s).
Resolved Caveats—Cisco IOS Release 12.0(28)S4 Workaround: Do not delete and re-add the same subinterface. Rather, enter the shutdown command followed by the no shutdown command to achieve the same effect. • CSCeh60368 Symptoms: On a Cisco 10000 series that is configured with 6-port channelized T3 line cards, when the primary and standby PREs are each loaded with a different Cisco IOS software release (for example, Release 12.0(28)S and Release 12.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 • CSCeh78918 Symptoms: When a line card has reloaded because you reloaded the router, the line card crashed, or you entered a command to reload the line card, the following message may appear on the console: %MDS-2-RP: MDFS is disabled on some line card(s). Use "show ip mds stats linecard" to view status and "clear ip mds linecard" to reset. This message may be generated because MDFS is erroneously disabled on the reloaded line card.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 Conditions: This symptom is observed when the CPU use of the router temporarily increases to more than 90 percent for several tens of seconds and when one or more high-priority processes are frequently active but do not necessarily use many CPU cycles.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 • CSCei07556 Symptoms: The PPP protocols flap on a 64K-port of an interface of a 1-port channelized OC-12/STM-4 (DS1/E1) ISE line card that is configured for CoS and that is congested. Conditions: This symptom is observed when two Cisco 12000 series are connected back-to-back, when the routers are connected via 1-port channelized OC-12/STM-4 (DS1/E1) ISE line cards, and when you send real-time traffic.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 • CSCei31560 Symptoms: On a 6-port channelized T3 line card that has a multilink bundle configured, the delay that occurs for traffic in a priority queue is about 12 to 14 milliseconds more than what you would expect. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0S that is configured with a multilink protocol such as MFR or MLP. These protocols and congestion may cause excess delay for priority traffic.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 • CSCei50162 Symptoms: The physical layer interface module (PLIM) of a 6-port channelized T3 that is configured for MLP may not be updated with MLP link information. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(28)S4 after you have reloaded the router. Workaround: Enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the affected MLP interfaces.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 Further Problem Description: The symptom occurs when the “CPK24 FPGA” detects that the SAR does not respond in the “Utopia interface.” The SAR then crashes because of a bad canonical header in the egress direction. • CSCsa64476 Symptoms: A Cisco 10000 series generates the following error message: %GENERAL-3-EREVENT: ACLs could not add IDB to list The message is followed by a traceback.
Resolved Caveats—Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 • CSCsa96941 Symptoms: When VBR ATM traffic is sent through a Cisco 12000 series 4-port ATM OC-3 ISE line card via an L2TPv3 IP tunnel to another 4-port ATM OC-3 ISE line card on another Cisco 12000 series, the VBR ATM traffic passes at lower rates than what is configured on the routers, and cell loss occurs. Conditions: These symptoms are observed on a Cisco 12000 series that is connected back-to-back via an OC-192 POS link to another Cisco 12000 series.
Resolved Caveats—Cisco IOS Release 12.0(28)S4 • CSCsb09190 Symptoms: A router misses an entry in its label forwarding table, which is shown in the output of the show tag-switching forwarding-table EXEC command for the missing entry and in the output of the show ip cef detail EXEC command for the prefix.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Workaround: Enter the shutdown interface configuration command followed by no shutdown interface configuration command on the active links to enable the links to renegotiate LCP with the correct Endpoint Discriminator value. Resolved Caveats—Cisco IOS Release 12.0(28)S3 Cisco IOS Release 12.0(28)S3 is a rebuild of Cisco IOS Release 12.0(28)S. The caveats listed in this section are resolved in Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Conditions: This symptom is observed only in networks where all of the EIGRP neighbors are declared as stub. Workaround: Remove the EIGRP stub feature or clear the IP EIGRP neighbors. • CSCee28126 Symptoms: A Cisco router crashes after configuring a sham link, and the sham link endpoints have different area IDs. Conditions: This symptom is observed when the areas on the two sham link endpoints are different.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Further Problem Description: The symptom is very unlikely to occur. The symptom does not occur on a router that has exclusively stub areas and NSSA areas. The symptom may occur when a router does not have exclusively stub areas and NSSA areas. • CSCef97738 Symptoms: BGP may pass an incorrect loopback address to a multicast distribution tree (MDT) component for use as the source of an MDT tunnel.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 • CSCeh17636 Symptoms: The ISIS metrics assigned to passive-interfaces on a Cisco router will be removed from the configuration after each reload. The passive- interface ISIS metric is used for biasing peer traffic on certain routers. Conditions: This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0(28)S1. Workaround: Reconfigure the ISIS metric after each reload.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Conditions: This symptom is observed on a Cisco 12000 series that is configured for multicast. Workaround: There is no workaround. • CSCef23912 Symptoms: A traceback is generated on the console and logged in the logging buffer, and the count in the output of the show alignment command increments.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 1. Attacks that use ICMP “hard” error messages 2. Attacks that use ICMP “fragmentation needed and Don’t Fragment (DF) bit set” messages, also known as Path Maximum Transmission Unit Discovery (PMTUD) attacks 3. Attacks that use ICMP “source quench” messages Successful attacks may cause connection resets or reduction of throughput in existing connections, depending on the attack type.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Conditions: This symptom is observed when the no access-list command fails while a nonvolatile generation (NVGEN) occurs. Workaround: There is no workaround. • CSCef89470 Symptoms: After you enter the shutdown interface configuration command followed by the no shutdown interface configuration command on an active GE interface or after you reload the router while an GE interface is active, the correct ARP entry is missing from the interface.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Conditions: This symptom is observed on a Cisco 10000 series when a security ACL is changed and immediately applied to an interface while traffic is traversing the interface. The symptom may occur on a Cisco 10000 series that is configured with either a PRE1 or a PRE2. Workaround: Wait several seconds between updating the ACL and applying it to the interface.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 • CSCeg66282 Symptoms: The controller of a 1-port multichannel STM-1 port adapter (PA-MC-STM1) does not come up after the router has reloaded. Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.0(28)S2. Workaround: There is no workaround. • CSCeg73076 Symptoms: A Cisco 10000 series reloads when a large QoS policy is defined.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 • CSCeh00169 Symptoms: After you have reloaded a router, for each of the service policies that are attached to the interfaces of a 4-port OC-12 POS ISE line card, the policing of L2 VCs may fail when errors with the following associated error messages occur: "Must remove existing service policy first .." or "Configured exceed actions are not supported when policing L2 VCs on interface..
Resolved Caveats—Cisco IOS Release 12.0(28)S3 - Multicast traffic may be punted to the RP with the “no group” reason, even if (*,G) and (S,G) exist on the PXF. You can observe the punted traffic in the output of the show hardware pxf cpu statistics diversion command. - PIM neighbors across an MDT in an MVPN network may flap. Conditions: This symptom is rarely observed when either PXF or the router is rebooted or reloaded while traffic runs in the network.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 • CSCeh20201 Symptoms: Traffic entering a 1-port channelized OC-12/STM-4 (DS1/E1) ISE line card is dropped. Conditions: This symptom is observed on a Cisco 12000 series when an MLP interface is moved from the 1-port channelized OC-12/STM-4 (DS1/E1) ISE line card to another line card. Workaround: There is no workaround. • CSCeh20219 Symptoms: The policer does not function for nxDs0 interfaces.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Symptoms: When the HA mode is RPR+ and a standby PRE comes up after a crash, the HA mode may change from RPR+ to SSO and the standby PRE displays error messages that indicate that the running configuration of the active PRE is “mode rpr-plus” but the running configuration of the standby PRE is “mode sso.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(30)S1 or any other image that includes the fix for caveat CSCsa64782, which is a preliminary requisite for default-route handling on an Engine 3 line card. The symptom occurs in the following scenario: 1) You configure BGP to advertise the target address, so the target address is directly known in the routing table.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Workaround: Enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the multilink interface of the Cisco 7500 series. • CSCin88303 Symptoms: The line protocol of unchannelized interfaces on a PA-MC-2T3+ port adaptor remains down although the link is up.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Workaround: There is no workaround. • CSCsa46699 Symptoms: A Cisco 7200 series may crash because of a bus error when you remove a subinterface or when you remove a service policy from an interface. Conditions: This symptom is observed when a hierarchical policy map is configured, when the policy map has a police action in the child only, and when the policy map is attached to two interfaces.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Workaround: There is no workaround. • CSCsa53685 Symptoms: Incorrect VC12 defect information may be generated on a Cisco 7500 series that is configured with a PA-MC-STM-1. Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.0(28)S1. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Workaround: Use the following ACL instead of the above-mentioned example: access-list 101 permit udp any any fragments access-list 101 deny udp any any eq 0 access-list 101 permit ip any any • CSCsa64782 Symptoms: When an ingress ISE line card is used with a default route that iBGP learns over a MPLS core, the following two symptoms may occur: – The output of the show controllers tofab alpha mip stat | i MTU command may show traffic drops.
Resolved Caveats—Cisco IOS Release 12.0(28)S3 Note, however, that the implementations of Cisco LSP ping draft version 3 do not reply with multipath lengths that can cause this crash. • CSCuk50159 Symptoms: If CEF is disabled before a switchover is performed, configuring DCEF after the switchover will not enable DCEF on the VIPs. Conditions: This symptom is observed on a Cisco 7500 series that is running Cisco IOS Release 12.0S and that is configured for High Availability.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 0x60BC47D0 0000000064 0000000013 0000000832 MLP bundle name 0x60BC47D0 0000000068 0000000008 0000000544 MLP bundle name 0x60BC47D0 0000000072 0000000001 0000000072 MLP bundle name 0x60BC47D0 0000000076 0000000001 0000000076 MLP bundle name 0x60BC47D0 0000000088 0000000018 0000001584 MLP bundle name Conditions: This symptom is observed when two interfaces are configured in the same multilink group or are bound to the same dialer profile.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Conditions: This symptom is observed when the no ipv6 pim command is entered on some subinterfaces of a physical Ethernet interface and when PIM is enabled on several subinterfaces of the same physical Ethernet interface. The symptom affects both IPv4 and IPv6, and configurations with multicast and OSPF Hello messages. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 • CSCef53395 Symptoms: A memory leak may occur in the IPC buffers of a Cisco router, and the output of the show processes memory command shows that the Pool Manager process holds increasingly more memory. Router#show proc mem Total: 231201504, Used: 202492916, Free: 28708588 PID TTY Allocated Freed Holding Getbufs 149227592 69514888 79894996 135335724 Retbufs Process ...
Resolved Caveats—Cisco IOS Release 12.0(28)S2 IP Routing Protocols • CSCea59206 Symptoms: When you configure the distribute-list router configuration command under the address-family ipv4 vrf vrf name router configuration command, the distribute-list router configuration command may appear under the main routing process as may be displayed in the output of the show running-config EXEC command.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Workaround: If the LSA is an external LSA (type5/type7), enter the clear ip ospf redistribution command on the neighboring router. In all other cases, enter the clear ip ospf process command on the neighboring router. • CSCee67164 Symptoms: A router LSA is not generated for a loopback address. Conditions: This symptom is observed when you assign an IP address to an unnumbered interface.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Miscellaneous • CSCeb52181 Symptoms: A Cisco platform that accesses the “system:/vfiles/tmstats_ascii” virtual file (for example, via “more system:/vfiles/tmstats_ascii”) may crash because of bus error. Conditions: This symptom is observed under normal working conditions when no configuration changes are made on a Cisco platform that runs Cisco IOS Release 12.0 S, 12.1 E, 12.2 or 12.3.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Conditions: This symptom is observed when the import map word command is configured as part of the VRF configuration. Note that eBGP routes are not filtered out. Workaround: There is no workaround. • CSCed85254 Symptoms: MPLS forwarding may stop. Conditions: This symptom is observed under the following conditions: – When you change a COS map or prefix map. – When you change an IP access list. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Workaround: Attach the policy map when the MLP interface is in the “UP” state. • CSCee18883 Symptoms: All VIPs in a Cisco 7500 series restart as a consequence of a Cbus complex that is triggered by a stuck output. Just before the output becomes stuck, IPC timeout errors occur. Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.3(5) in a dLFIoATM environment. The symptom may also occur in other releases.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Conditions: This symptom is observed on a Cisco 12000 series when you use Multilink PPP (MLP) interfaces with service policies attached. Workaround: There is no workaround. • CSCee53667 Symptoms: A ping to an interface of an Engine 3 Gigabit Ethernet line card fails after an RP switchover occurs. Conditions: This symptom is observed on a Cisco 12000 series that functions in SSO HA mode when an RP switchover occurs after the line card has been reloaded.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 • CSCee79728 Symptoms: A Cisco 7200 series that operates in the process switching path may crash with a bus error exception. Conditions: This symptom is observed on a Cisco 7200 series that runs Cisco IOS Release 12.2(13b)M2 and that is configured with a serial or POS port adapter. The symptom may also occur in other releases. Workaround: Enter the ip route cache command for all interfaces.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Conditions: This symptom is observed on a Cisco 12000 series when a large number of subinterfaces are configured on a port channel, when you remove a member from the channel group, and when you immediately afterwards reload microcode onto the line card. After the line card has come up, you cannot add members to the channel group until all the subinterfaces of the removed member are deleted. This situation occurs because of a race condition.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Workaround: Configure the static ARP entries for the nexthop router that is configured in the static recursive routes. • CSCef25917 Symptoms: A 4GE-SFP-LC line card may reload unexpectedly when it processes QoS traffic in a configuration with a VLAN on a VCG that is configured with an ingress CoS. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Conditions: This symptom is observed on a Cisco 12410 that is configured with two Performance Route Processors (PRP-1) that function in Route Processor Redundancy (RPR) mode and that runs one of the following images: – The c12kprp-p-mz image of Cisco IOS Release 12.0(24)S3. – The c12kprp-p-mz image of Cisco IOS Release 12.0(23)S4. – The c12kprp-k3p-mz image of Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Conditions: This symptom is observed on a Cisco 12000 series that runs the gsr-p-mz image of Cisco IOS Release 12.0(26)S4 or a later release but may also occur in other releases. Workaround: There is no workaround. • CSCef49138 Symptoms: When you enter the show policy-map interface interface-number command, a router may crash because of a bus error exception.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 • CSCef54779 Symptoms: Under a rare condition, when a main interface switches over to a backup interface on 4-port GE line card, a ping to another neighboring interface that is not at all related to the backup interface fails. A sniffer trace shows that the Src/Dst MAC address in the ICMP reply is that of the backup interface.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(28)S1. Workaround: Reload the line card. If this is not an option, there is no workaround. • CSCef66562 Symptoms: The cbQosPolicyMapName object may stop functioning. Conditions: This symptom is observed when an active view includes the ciscoPingMib.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Workaround: Disable the CEF table consistency checker so that no passive scan check is performed of tables of the line cards. • CSCef68324 Cisco Internetwork Operating System (IOS) software is vulnerable to a Denial of Service (DoS) and potentially an arbitrary code execution attack from a specifically crafted IPv6 packet. The packet must be sent from a local network segment.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Workaround: There is no workaround. • CSCef78098 Symptoms: An Engine 1 or Engine 2 Gigabit Ethernet (GE) line card may stop switching traffic even though the line protocol is up. Pings and routing do not work, and traffic does not go through. Conditions: This symptom is observed a Cisco 12000 series after error recovery and when the negotiation auto command is not configured for the interface of the GE line card.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Workaround: Change the default merge algorithm to POD by entering the hw-module slot slot-number reload command for the slot in which the affected line card is installed. Alternate Workaround: To avoid problems with the policy map modification, remove the service policy from the interface, modify the service policy, and reattach the service policy to the interface. • CSCef83864 Symptoms: A Cisco 10000 series reloads unexpectedly.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 The symptom occurs when the VRF ingress interface is configured on an Engine 2 3-port GE line card or Engine 2 1-port OC-48 POS line card. Other line cards may be affected too. The symptom does not occur when the VRF ingress interface is configured on an Engine 0 4-port OC-3 POS line card or 4-port GE ISE line card. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 • CSCef93354 Symptoms: When MLP and SSO are configured and interfaces in a multilink bundle flap, the secondary PRE does not handle this situation correctly. When a PRE switchover occurs, the MLP bundle may enter an inappropriate state. Conditions: This symptom is observed on a Cisco 10000 series. Workaround: There is no workaround. To recover from the symptom, reload the Cisco 10000 series.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 • CSCeg00111 Symptoms: Padded IP fragments with an IP length that is shorter than 64 bytes and the More Fragments (MF) (which is set to 1) are dropped by an Engine 4+ line card that functions as an egress line card. Conditions: This symptom is observed when the ingress line card is an Engine 4+ DPT line card and the egress line card is any Engine 4+ line card. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(23)S3 or a later release and that is configured with an Engine 4 plus 4-port OC-48 line card when the hardware of the line card is reset as a result of an error recovery process. Workaround: Disable and re-enable Sampled NetFlow. • CSCeg03180 Symptoms: A line card in slot 15 is stuck in the WAITRTRY state.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 • CSCeg11421 Symptoms: A Cisco 10720 crashes when you delete an IPv6 ACL. Conditions: This symptom is observed when you delete the IPv6 ACL during the TurboACL compilation. Workaround: Wait for the ACL to be fully compiled before you delete it.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Workaround: There is no workaround. Further Problem Description: The fix for this caveat causes packets that are sent to the RSP for switching to be dropped. Distributed forwarded packets are forwarded correctly. • CSCeg30179 Symptoms: Removing a policy that has shape and bandwidth in the same class (in that same order) may cause a router to crash. Conditions: This symptom is observed when the router functions under a traffic load.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Conditions: This symptom is observed on a serial interface of a PA-MC-8TE1+ when there is a channel-group configuration for the interface. Workaround: Remove the channel-group configuration for the interface. • CSCin79436 Symptoms: A Cisco 12000 series does not fragment IP traffic while switching the traffic into the MPLS core even when the size of the incoming IP packets exceeds the IP MTU of the egress interface.
Resolved Caveats—Cisco IOS Release 12.0(28)S2 Conditions: This symptom is observed on a Cisco 12000 series that runs an interim release for Cisco IOS Release 12.0(30)S after you configure IP QoS on an ATM interface of the line card. Note, however, that this caveat is resolved in Release 12.0(30)S. Workaround: There is no workaround. Wide-Area Networking • CSCef45502 Symptoms: A connection remains to exist on a line card even though the connection is deleted on the RP.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Resolved Caveats—Cisco IOS Release 12.0(28)S1 Cisco IOS Release 12.0(28)S1 is a rebuild of Cisco IOS Release 12.0(28)S. The caveats listed in this section are resolved in Cisco IOS Release 12.0(28)S1 but may be open in previous Cisco IOS releases. This section describes only severity 1, severity 2, and select severity 3 caveats.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 %MDS-2-LC_FAILED_IPC_ACK: RP failed in getting Ack for IPC message of size 84 to LC in slot 2 with sequence 1007, error = timeout %RSP-3-RESTART: interface Serial3/0/0:0, not transmitting %VIP2-3-MSG: slotX VIP-3-SVIP_CYBUSERROR_INTERRUPT: A Cybus Error occurred.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 snmp-server community public2 view NOMEMPOOL ro 7 snmp-server community public3 view NOMEMPOOL ro 8 The specific MIB that is being blocked is the ciscoEnhancedMemPoolMIB MIB (1.3.6.1.4.1.9.9.221). Once the configuration is in place, the router must be reloaded to clear the IPC cache and free the memory. • CSCee60844 Symptoms: A software-forced crash may occur on a Cisco 7500 series.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 EXEC and Configuration Parser • CSCee64504 Symptoms: A CPUHOG may occur for about 4.5 seconds when you enter the show running-config command. Conditions: This symptom is observed on a Cisco uBR10000 series but may also occur on other platforms. Workaround: Do not enter the show running-config command. Rather, enter the show config command.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Serial4/7 unassigned YES NVRAM administratively down down Serial5/0:23 10.0.0.1 YES NVRAM down down Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.0(26)S1 when you attempt to configure the interface and bring it up. Workaround: There is no workaround. • CSCee47714 Symptoms: Entering the shutdown command on a controller of a Packet over T1/E1 Network Transceiver puts the controller permanently down.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 IP Routing Protocols • CSCds67028 Symptoms: A Cisco 7200 series router may reload with a bus error in ipigrp2_ager. Conditions: This symptom can occur while the router is running Enhanced Interior Gateway Routing Protocol (EIGRP). Workaround: There is no workaround. • CSCed33044 Symptoms: ARP may not function properly on the remote side of point-to-point Fast Ethernet link with a default static route until the remote side is pinged.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.0S, Release 12.2S, or Release 12.3T. Workaround: There is no workaround. • CSCee11274 Symptoms: BGP may fail to reestablish a session when you remove a line card, PA, VIP, or module and replace it with a card of a different type. For example, the problem occurs when you remove a 1-port GE line card and replace it with a 3-port GE line card.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 3. The summary LSA IDs for the intra-area routes above, when ORed with the host bits of the corresponding masks, yield identical LSA IDs. For example, 10.10.10.128/25 and 10.10.10.0/24 yield identical LSA IDs when the network address is logically ORed with the host bits; i.e., 10.10.10.128 | 0.0.0.127 = 10.10.10.255 10.10.10.0 | 0.0.0.255 = 10.10.10.255 Workaround: Perform the clear ip ospf proc command on all ABRs containing the obsolete LSAs.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This symptom is observed when a large number of VRFs (more than 200) and prefixes (more than 220,000) are configured. Workaround: There is no workaround. • CSCee59315 Symptoms: A BGP VPNv4 table may contain paths that may be imported from deleted BGP table entries or from table entries that have a different prefix from the importing prefix. An example of a path from a deleted BGP table entry is as follows: Router# sh ip bgp v v vpn2 192.168.0.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCee65066 Symptoms: The CISCO-PIM-MIB trap ciscoPimInvalidJoinPrune is supposed to contain the following varbinds: 1.3.6.1.4.1.9.9.184.1.1.4 - cpimLastErrorOriginType 1.3.6.1.4.1.9.9.184.1.1.5 1.3.6.1.4.1.9.9.184.1.1.4 - cpimLastErrorOriginType 1.3.6.1.4.1.9.9.184.1.1.5 - cpimLastErrorOrigin 1.3.6.1.4.1.9.9.184.1.1.6 - cpimLastErrorGroupType 1.3.6.1.4.1.9.9.184.1.1.7 - cpimLastErrorGroup 1.3.6.1.4.1.9.9.184.1.1.8 - cpimLastErrorRPType 1.3.6.1.4.1.9.9.184.1.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Workaround: Configure the neighbors by grouping into sets or peer-groups, in which a few of the neighbors in each set share similar outbound policy. Each set will fall into a separate update group or peergroup. • CSCee83549 Symptoms: When multipath is configured, one of the paths may have an inconsistent (old) label, causing only one path to be operational.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This symptom is observed under the following conditions: – There are multiple paths to reach the same prefixes. – One source LSP removes a prefix and another LSP adds the same prefix, while both paths between the prefix and the LSPs are of equal cost. Workaround: Enter the clear isis * or the clear ip route * command to restore the prefix. However, doing so clears all the routes and recalculates them again, which is a disruptive action.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Condition 1: This symptom is observed when you configure the CNS cns config notify diff global configuration command and you configure interface global configuration commands on the Cisco IOS device. Workaround 1: There is no workaround if only the changes in the configuration are expected in the CNS configuration notify changed message. Alternate Workaround 1: Specify the all option for the cns config notify global configuration command. 2.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCed02844 Symptoms: IPv6 adjacencies may appear as incomplete, and connectivity may be broken. This situation occurs at random times and is not associated with any event in particular. IPv4 adjacencies may appear as incomplete but recover within a minute. Conditions: This symptom is observed on a Cisco IOS-based router when you enter the clear adjacency command.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCed54080 Symptoms: Per-VPN per-destination loadbalancing does not operate correctly on an Engine 2 or 4+ and there seems to be loadsharing only on BGP nexthop. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(23)S4. Workaround: The clear ip route vrf vrf-name command invokes a recalculation of the hashes. Also, the clear ip bgp neighbor soft command (can) reassign(s) new labels and respread(s) the load.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This symptom is observed when you make two copies of the image file to the disk by using two vtys and by entering the dir diskslot-number command at the same time. Workaround: Do not enter the show diskslot-number and dir diskslot-number commands when multiple images are being copied. 3) Symptoms: There are two symptoms: – The show diskslot-number and dir diskslot-number commands may show inconsistent information.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Alternate Workaround: Decrease the rate of packets drops by increasing the sampling period. For example, when you enter the ip flow-sampling-mode packet-interval 10 command, up to 10 percent of packets that are larger than 1496 bytes are dropped. However, when you enter the ip flow-sampling-mode packet-interval 1000 command, only 0.1 percent of packets that are larger than 1496 bytes are dropped.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Workaround: Reduce the number of applied class maps. • CSCed76109 Symptoms: On a Cisco 7500 series that is equipped with Versatile Interface Processors (VIPs) with ATM port adapters, the ATM PVCs may not come back up after the ATM interface flaps. This occurs because the interfaces in the VIP do not transmit any packets but still process incoming traffic.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 NewConfig#: OldConfig#: ! MyPolicy test TEST2 description TESTTEST class m_new shape peak 8010 priority Conditions: This may occur when the CNS configuration notify agent is configured by the cns config notify configuration command and policy-map CLI is configured on the Cisco IOS device. Workaround: There is no workaround. • CSCed95753 Symptoms: A GRE tunnel may not work on a PE router.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCee14840 Symptoms: A Cisco 12000 series running Cisco IOS Release 12.0(26)S1 may advertise erroneous IPv6 networks when configured for both 6PE and Route Reflector operation. Conditions: This symptom is observed on a network in which 6PE is implemented on an existing dual-stack (IPv4 and IPv6) configuration. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCee22933 Symptoms: CBR-type or VBR-type VP cell-relay or cell-packing AToM VCs may not be able to retain their bandwidth to the configured CBR or VBR shaping rate. This situation persists even when the total shaping rate of the VPs and VCs is far below the physical bandwidth of the interface. Conditions: This symptom is observed when there are many other cell-relay or cell-packing AToM VCs configured. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCee28481 Symptoms: After working fine for sometime, a 4-port OC-12 ATM line card stops forwarding unicast packets to the RP, and none of the unicast traffic that is sourced from or destined to the RP via the 4-port OC-12 ATM line card goes through. Unicast traffic to the 4-port OC-12 ATM line card interfaces fails too. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(21)ST7 when MPLS is enabled on the line card.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCee30527 Symptoms: After reloading a Cisco 12000 series, the following message may be seen on an Engine 2 or Engine 3 line card: %MBUS-2-DNLDFAIL: IOS download to slot 7 fail, timeout In some cases this situation may prevent the line card from coming up: %GRP-3-ABANDON_DOWNLOAD: End attempt to start the linecard in slot 7 Conditions: This symptom is observed rarely on a Cisco 12000 series that is running the gsr-p-mz image of Cisco IOS Release 12.0(28)S.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This symptom is observed when the active RP is reloaded by entering the microcode reload command. Workaround: There is no workaround. • CSCee34076 Symptoms: Routes that are removed soon after an SSO switchover occurs may remain in the CEF table. Conditions: This symptom is observed when VRFs are configured. Workaround: There is no workaround. • CSCee34094 Symptoms: A standby RP keeps crashing.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCee35659 Symptoms: A priority class cannot be configured if the remaining bandwidth is used on the existing classes. Such a service policy is rejected. Conditions: This symptom is observed on Cisco 12000 series-ISE based line cards. Workaround: Use police actions in the priority class in conjunction with bandwidth percentages on the existing classes.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Workaround: Unconfigure and reconfigure the VRF configuration on the misconfigured subinterfaces. • CSCee40349 Symptoms: Cisco 12816 and 12810 routers need to have specific MBSU 5v and on- board 5v thresholds other than the values in the legacy system. Otherwise, there may be error messages in the console logs that complain that the voltages are abnormal. Conditions: This symptom is observed on Cisco 128xx series routers.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Workaround: Reload the line card.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This symptom is observed on a Cisco router that has VCS configured with local switching. Workaround: There is no workaround. • CSCee51126 Symptoms: A Cisco 12000 series may drop 2 to 3 percent of the ping packets that are destined to the router when the input interface is an Engine 4+ line card. Conditions: This symptom is observed for ICMP packets on a Cisco 12000 series that is Cisco IOS Release 12.0(26)S1.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This symptom is observed on a Cisco 12016 that runs Cisco IOS Software 12.0(25)S2 when you enter the hw-module slot 17 shutdown command to shut down the master scheduler card. Workaround: Do not shut down the master scheduler card. • CSCee55457 Symptoms: When a channel group (for example, channel +1) is removed from a controller, the class-default queue gets stuck on the next time slot/channel.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 – The router functions as a PE router with the Engine 4+ POS line card facing the core and performing MPLS disposition. – VRFs are configured on the router. – The Explicit Null feature is enabled on the router. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCee65004 Symptoms: A 1-port 10-Gigabit Ethernet line card (1X10GE-LR-SC) may crash, reporting %TX192-3-CPUIF errors. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(27)S1 when you shut down the 10GE port of a 4-port 10 Gigabit Ethernet module (WS-X6704-10GE) that is installed in a Cisco 7609 at the other side of the connection. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Workaround: There is no workaround. • CSCee70024 Symptoms: LSP-Ping packets may include a Vendor Enterprise Code TLV Type 5 with a length that is greater than 4 and with Vendor Private Extensions. According to the draft-ietf-mpls-lsp-ping-05.txt IETF draft, the Vendor Enterprise Code TLV Length should always be 4, and the vendor extensions should use a TLV Type that is in the range 64512-65535.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCee73410 Symptoms: When you enter the redundancy force-switchover command, IPC messages and tracebacks may be generated on an Engine 2 3-port GE line card. Conditions: The symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0S and that has dual PRPs. Workaround: There is no workaround. • CSCee74419 Symptoms: When L3 VPN routes flap, the PLU utilization on line cards in a PE router may increase to and remain at 99 percent.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(26)S or an earlier 12.0 S release. Workaround: There is no workaround other than excluding the access to the MIB. • CSCee76995 Symptoms: A packet becomes corrupted when you ping a POS line card. Conditions: This symptom is observed on a Cisco 12000 series Engine 0 4-port OC-3 POS line card. It only affects IOS 12.0(28.3)S. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This temporary counter condition is observed only for one or two sample periods and affects the MPLS-TE auto-bandwidth mechanism because the collection timer may be invoked at a time while the counter is at an extreme value. If the auto-bandwidth mechanism collection value is greater than the physical interface capability, the LSP tunnel build fails at the next LSP tunnel build. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(27)S1 when you shut down the 10GE port of a 4-port 10 Gigabit Ethernet module (WS-X6704-10GE) that is installed in a Cisco 7609 at the other side of the connection. Workaround: There is no workaround. • CSCee90155 Symptoms: A TLU memory leak occurs on an Engine 3 line card that has aggregate IPv6 labels when the associated IPv6 route is flapped or changed.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This symptom is observed on an interface of a Cisco 12000 series Engine 4+ line card when the interface is configured for shaping. Workaround: Use a QoS group value in the range of one through seven in the policy map. • CSCee93228 Symptoms: Under certain unknown circumstances, a traceroute may trigger a process watchdog. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(26)S2.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCef08388 Symptoms: After a forced switchover, if you shut down a POS interface and save the configuration, the shutdown command does not show for this interface in the output of the show running-config command even though the output of the show ip interface brief shows that this interface is in the DOWN/DOWN state. Conditions: The symptom is observed on a Cisco 12410 and Cisco 12416 that run Cisco IOS Release 12.0(25)S4.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCef14150 Symptoms: The show policy-map interface command and its corresponding MIB, CISCO-CBQOS-MIB, report no or fewer Random Drops than what the router actually drops. Conditions: The problem occurs only on interfaces at or faster than 500 Mbps. Workaround: There is no workaround. • CSCef16326 Symptoms: When you remove a policy map from a subinterface, the subinterface may become stuck, preventing traffic from passing through the subinterface.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 MSD: %Camr_VA-3-STATISTICS: VA statistics register: 0x0098 reports VA_SO_PKT_LEN_ERR_COUNT = 3 – In the output of the show interface srp 1/1 command, the received error counters such as “framer runts” and “input errors” have a large value. – In the output of the show hard pxf cpu statistics interface srp 1/1 detail command, the “destination unreachable” counter increases.
Resolved Caveats—Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: This symptom is observed on a Cisco 12000 series that has hardware-enabled multicast configured on a VRF interface. Workaround: Disable hardware multicast on the VRF interface. • CSCef31934 Symptoms: In a scaled configuration with hundreds of eBGP peers with very low BGP timers, issuing clear ip bgp * may increase HW forwarding memory utilization.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 • CSCef42849 Symptoms: Timing violation occurs in the PRE2/PRE1 temperature sensor routine. Since the temperature sensor routines violate timing requirements, the temperature reading fails in new device from a new vendor. Conditions: The failure occurs only in new temperature sensor from new vendor. All old type of sensors are not effected. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Conditions: The symptom is observed in Cisco IOS Release 12.0(28)S and earlier releases. Workaround: There is no workaround. • CSCef53109 Symptoms: A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(8)S may experience following problem when the do command with arguments is issued from an interface member of a port-channel or pos-channel: Router#conf t Enter configuration commands, one per line. End with CNTL/Z.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Workaround: There is no workaround. • CSCuk51177 Symptoms: You may not be able to make a Telnet connection to a Cisco IOS platform. Conditions: This symptom is observed when the CNS Exec Agent is used to remotely issue an interactive CLI command. Workaround: There is no workaround. • CSCuk51269 Symptoms: Multicast packets such as HSRP and OSPF are not received on a port-channel interface.
Resolved Caveats—Cisco IOS Release 12.0(28)S1 Wide-Area Networking • CSCdx84284 Symptoms: A router may not recognize some inbound Multiprotocol Label Switching (MPLS)-tagged packets that are sent via Frame Relay. Because the router cannot recognize the inbound MPLS-tagged packets, MPLS cannot switch those packets to the outgoing interface. The MPLS-tagged packets are dropped by the router, and the router does not increment the input-packet counter in the output of the show frame pvc output EXEC command.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCuk51367 Symptoms: A router may crash if a multipoint Frame Relay subinterface is deleted. Conditions: This symptom is observed only when there are multiple PVCs configured on the Frame Relay subinterface and when these PVCs have maps attached to the VCs. Workaround: Remove the individual maps and PVCs from the subinterface before you delete the subinterface. Resolved Caveats—Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(28)S Alternate Workaround: Do not use dCEF. • CSCec22829 Symptoms: A router may reload unexpectedly. Conditions: Same Timer wheel is used from both process level and interrupt level. Workaround: There is no workaround. • CSCec39376 Symptoms: A Flash memory card may become corrupted.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: This symptom is observed on a Cisco 7500 series router that is running Cisco IOS Release 12.0(23)S5 but is not platform dependent. Workaround: Configure the tftp-server to access flash devices on the master route switch processor (RSP) only.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.1(10) but may also occur in other releases. Workaround: There is no workaround. • CSCea62753 Symptoms: Fragments produced on a Route Switch Processor (RSP) may be corrupted. The fragments may have extra bytes of garbage that may cause the remote end to drop the packets since the remote end cannot rebuild the packets.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed47550 Symptoms: BGP Policy Accounting information is not available via SNMP for 802.1Q VLAN subinterfaces. Conditions: This symptom is observed on Cisco 12000 and 7500 series routers. Workaround: There is no workaround. • CSCin64671 Symptoms: A Cisco RSP VIP can crash during bootup. Conditions: This symptom is observed on a Cisco 7500 series when the Cisco IOS software image is booted. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCec07592 Symptoms: The best path is not chosen correctly on a Cisco router. Conditions: This symptom is observed when the bgp deterministic med router configuration command is configured on a Cisco router. The symptom occurs when different values of Multi Exit Discriminator (MED) are set for peers. In this particular situation, the symptom occurs when different values of MED are set to different peers. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S Workaround: Do not use a cut-and-paste operation to remove the network commands simultaneously with the area that is referenced in the network commands. • CSCec70366 Symptoms: When the multicast route (mroute) expiration timer is set to a nondefault holdtime value, a router may reload unexpectedly because of a watchdog timeout.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: This behavior is observed in Cisco IOS Release 12.0(25)S and later releases on a router with the ip routing external overload signalling hidden command enabled. Earlier Cisco IOS releases are not affected. Workaround: Enter the no ip routing external overload signalling hidden command.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed55567 Symptoms: A Cisco router may crash. Conditions: This symptom is observed after you enter the shutdown interface configuration command followed by the no shutdown interface configuration command multiple times on different interfaces. Workaround: There is no workaround. • CSCed60289 Symptoms: IP background process is sluggish. Conditions: This symptom occurs when many interfaces go down at the same time. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed75295 Symptoms: FRR LSPs may fail to provide protection with a Next-next-hop (NNHOP) backup tunnel. Conditions: This symptom is observed only when a primary LSP reaches beyond a merge point. Workaround: There is no workaround. • CSCed82273 Symptoms: IPv6 BGP may not reach the established state. Conditions: This symptom is observed on a Cisco 12000 series that runs the gsr-p-mz image of Cisco IOS Release 12.0(26)S2 or Release 12.0(28)S.
Resolved Caveats—Cisco IOS Release 12.0(28)S Miscellaneous • CSCdx83013 Symptoms: A Cisco 7200 series router may reload when you insert an ISDN BRI port adapter. Conditions: This symptom is observed on Cisco 7200 series router that is configured with a Network Processing Engine G1 (NPE-G1). Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S The display of a traceback message is too severe in this situation. The correct behavior is that the excess route-map policies and/or route-maps per policy should be ignored, and an informational message should be displayed. This informational message should state that the Cisco 10000 series PBR limits for route-map policies and/or route-maps per policy has been exceeded.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCeb70755 Symptoms: Sporadic error recovery may occur on an Engine 4 plus (E4+) line cards after a corrupt packet that comes from the fabric is detected. The error recovery is indicated by %TX192-3-PAM_MODULE and %TX192-3-PAM_PIM error messages on the E4+ line card. The packets are corrupted by Engine 3 line cards and are triggered by routing convergence. Conditions: This symptom is observed on a Cisco 12416 router that runs Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCec14039 Symptoms: A Network Processing Engine G1 (NPE-G1) may restart unexpectedly and report the following message: Last reset from watchdog reset Conditions: This symptom is observed on a Cisco 7200VXR series that is configured with an NPE-G1 Network Processing Engine Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S %TFIB-2-MEMORY: No memory for expanded TFIB PSA -Traceback= Conditions: This symptom is only observed on an MPLS-capable Cisco platform and only when the label space has been exhausted to the maximum level supported by the platform or is about to be exhausted (only a few hundred labels are available) and when the TFIB table is expanded further. Workaround: Enter the mpls label range 16 101900 command at the conf-t level to avoid the error messages.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: These symptoms are observed on a Cisco 12000 router with a PRP-1 and a full or nearly full chassis after the test crash command is entered. The router becomes inaccessible and inoperable. This only happens when the exception warmstart 60 5 global configuration command is configured. Workaround: Disable the exception warmstart global configuration command. Note, however, that when you do so, caveat CSCeb70797 may occur.
Resolved Caveats—Cisco IOS Release 12.0(28)S Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 5526 Queueing strategy: fifo Output queue: 31/40 (size/max) . . . Conditions: This symptom is observed on a multilink interface that has two E1 interfaces in a multilink bundle when there is a low traffic rate. Workaround: Use the physical interface without a multilink bundle. • CSCec77256 Symptoms: Basic VPN with SRP Dense (E4P) links fail the ping test.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCec80283 Symptoms: An IP Services Engine (ISE) line card may display high CPU utilization. Conditions: This symptom is observed on an ISE line card in a Cisco 12000 series when Multiprotocol Label Switching (MPLS) packets are sent to the nonlabel-switched interface of the ISE line card. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S Workaround: Performing a shut command followed by a no shut command on the PVC will reactivate it. Alternate Workaround: Disable OAM management. • CSCed00334 Symptoms: A router crashes on configuring an ATM ESI address. Conditions: This symptom is observed when a deleted subinterface is reused. Workaround: There is no workaround. • CSCed01613 Symptoms: The data path may be broken.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: This symptom is observed on a Cisco 12000 series router. Workaround: There is no workaround. • CSCed06105 Symptoms: An RP may crash when a protected link is cut. Conditions: This symptom is observed on a Cisco 12000 series with an PRP that functions as a PE router with FRR, that protects VPN traffic over an PE-to-PE traffic engineering tunnel, and that has a Fast Reroute SNMP trap enabled. Workaround: Disable the Fast Reroute trap.
Resolved Caveats—Cisco IOS Release 12.0(28)S – CSCdu45201: Symptoms: When the encapsulation ppp interface configuration command is configured on Cisco 12000 series Packet-over-SONET (POS) APS interfaces, some APS operations may result in an inappropriate protocol state. This situation may stop all traffic flow through the APS pair or duplicate all packets. Conditions: This symptom is observed on a Cisco 12000 series router. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed11793 Symptoms: The output queue of a Gigabit Ethernet port may become stuck, preventing traffic from leaving the interface. Conditions: This symptom is observed on the Gigabit Ethernet port 0/1 (gig0/1) of a Network Processing Engine NPE-G1 (NPE-G1) that is installed in a Cisco 7200 series. Workaround: Enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the affected interface.
Resolved Caveats—Cisco IOS Release 12.0(28)S Workaround: There is no workaround. Ensure that you use the latest Field Diagnostics image that supports the 2xOc192 POS line card. • CSCed15797 Symptoms: On Engine 2 (E2) n-port OC3 line cards for the Cisco 12000 series router, the pos delay triggers path router configuration command does not implement the specified delay.
Resolved Caveats—Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(28)S – An Engine 4 plus GE linecard is present in the path before the packets reach the Engine 4 plus POS line card. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed22837 Symptoms: A router may reload unexpectedly when packets are tag switched. Conditions: This symptom is observed when a Bridge-Group Virtual Interface (BVI) is created after the router has booted up, when IP packets are received through the BVI, and when these IP packets are forwarded as Multiprotocol Label Switching (MPLS) packets through another interface.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: When a VC is created, if the VC goes down or is inactive during the first 60 secs, the flowbit information may not be updated correctly on the line card. Workaround: Create another VC. This will cause IOS to go through all of the active VCs and update all their flowbit information. • CSCed25921 Symptoms: Traffic loss and tracebacks may occur on an Engine 2 (E2) 4xOC12 line card when diagnostics are run on the backup clock scheduler card (CSC).
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed29514 Symptoms: A Cisco 7200 series NPE-G1 built-in GE (SBeth) MAC filter may accept NULL DAs (00-00-00-00-00-00). This unintentional behavior may pose a denial of service security risk in customer environments when their networks are flooded with NULL DAs. Conditions: This symptom is observed when NULL DAs are presented to an NPE-G1 GE interface. This situation may be either a third-party vendor product flaw or a third-party vendor documentation error.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed33627 Symptoms: A 3-port Gigabit Ethernet (GE) line card may show an BMA error, then run error recovery. Conditions: This symptom is observed on a Cisco 12008/40 router that is running Cisco IOS 12.0(23)S5, that is configured as an MPLS inter-AS ASBR, and that is also configured as a PE router. When you enter the shutdown command followed by the no shutdown command on a POS interface of an 8-port POS line card, the 3-port GE line card shows an BMA error.
Resolved Caveats—Cisco IOS Release 12.0(28)S Workaround: Avoid renaming the policy-map. • CSCed37749 Symptoms: Any Transport over Multiprotocol Label Switching (AToM) virtual circuits (VCs) may fail to come up. Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.2 S and that is configured for AToM and Cisco Express Forwarding (CEF). The symptom may also occur in Release 12.0 S. Workaround: Toggle the CEF configuration; that is, remove CEF and reconfigure CEF.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed40933 Cisco Internetwork Operating System (IOS) Software is vulnerable to a Denial of Service (DoS) attack from crafted IPv6 packets when the device has been configured to process IPv6 traffic. This vulnerability requires multiple crafted packets to be sent to the device which may result in a reload upon successful exploitation. More details can be found in the security advisory, which is posted at http://www.cisco.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed43829 Symptoms: Random Early Detection maintains an average length of the outbound queue of a class of traffic, and randomly discards newly arriving packets when the average falls within the configured range. A Cisco 10000 series router may contain an error in the average queue length computation which makes Random Early Detection too sensitive to the instantaneous queue length.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed45698 Symptoms: Unused ports on a 1-port multichannel STM-1 port adapter (PA-MC-STM-1) may flap even when they are not processing any traffic. Conditions: This symptom is observed when there is congestion on used ports of the PA-MC-STM-1 and when a committed access rate (CAR) is configured on these used ports. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed46856 Symptoms: Most multicast traffic is dropped if an ingress interface is an interface of an E4+ line card and NetFlow is configured. Conditions: This symptom occurs when multicast traffic is forwarded down a shared tree, for example, forwarded by (*, g). Workaround: Either unconfigure NetFlow or disable the SPT threshold to move to the shortest path tree.
Resolved Caveats—Cisco IOS Release 12.0(28)S Background, PC = 400DC728. -Traceback= 400DC730 40DBFE60 40DBFFD4 40DC0B14 400C5A04 400C59F0 Conditions: This symptom is observed when the default route gets updated to Engine 3 line cards and is reported by these line cards as seen above. This situation may happen after an interface flap or a routing update elsewhere in the network.
Resolved Caveats—Cisco IOS Release 12.0(28)S router# conf t Enter configuration commands, one per line. End with CNTL/Z. router(config)# cont sonet 3/0/0 router(config-controller)# no aug cont router(config-controller)# no aug controller router(config-controller)# Workaround: There is no workaround. • CSCed51139 Symptoms: A Cisco 12000 series router with an HA configuration (dual RP redundancy) and with GE line cards which are using channel groups, might not be pingable after a redundancy switchover.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed52163 Symptoms: When the HSRP MIB is polled and there are HSRP groups configured on subinterfaces, an error such as “OID not increasing” may occur on the device that is polling the router. In some cases, a CPUHOG traceback may occur on a router when the HSRP MIB is polled, especially when a lot of interfaces are configured.
Resolved Caveats—Cisco IOS Release 12.0(28)S Workaround: There is no workaround. • CSCed54416 Symptoms: A Cisco 12000 series may reload unexpectedly. Conditions: This symptom is observed when Multiprotocol Label Switching (MPLS) Fast Reroute (FRR) is configured. Workaround: There is no workaround. • CSCed55962 Symptoms: From a local customer edge (CE) router, you may not be able to reach or ping some prefixes (subnets) on a remote CE router over an Multiprotocol Label Switching (MPLS) network.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: This symptom is observed on a Cisco 10720 router running Cisco IOS Release 12.0(26)S or a later release. Workaround: There is no workaround. • CSCed57841 Symptoms: When the error message “Info: Illegal normal burst size, increased to mtu size 4470” is generated on a channelized STM-1 MM PA, the VIP in which this PA is installed and the RSP may crash. Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: This symptom is observed on a Cisco 12000 series when IP-to-tag traffic arrives from an Engine 4+ line card and enters an Engine 0 line card that has a rate limit configured. The IP-to-tag traffic is dropped. Workaround: Remove the rate limit from the Engine 0 interface, and enter the shutdown command followed by the no shutdown command on the interface.
Resolved Caveats—Cisco IOS Release 12.0(28)S Step 1) Remove the RED configuration. Step 2) Reload microcode onto the line card (a 2-port OC-3 channelized to DS1/E1 line card or a 6-port channelized T3 line card). Step 3) Reapply the RED configuration. • CSCed65027 Symptoms: When the MTU is toggled from 4470 to 9180 or 64, a 4xOC12 ATM line card may enter the “ERR CARV” state and does not recover. Even reloading the line card does not bring it back up.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed69546 Symptoms: When mixed channels are defined on a channelized OC-12 line card and these channels include DS3s, T1s, an DS0s, CEF/RIB inconsistency may occur, preventing traffic to be sent over the correct interfaces. Conditions: This symptom is observed on a Cisco 10000 series.
Resolved Caveats—Cisco IOS Release 12.0(28)S This statement is not true because the per VC policy-map statistics are available in the case of L2VPN PVCs on this line card. Condition 2: This problem is seen when the same policy map as in Condition 1 is modified to include policing. Workaround 2: There is no workaround. • CSCed71490 Symptoms: After a Stateful Switchover (SSO) occurs on a Cisco 7500 series router, traffic destined for the router may fail for about 10 minutes.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed73722 Symptoms: On an Engine 3 4GE line card, traffic from a Catalyst switch to a Cisco 12000 series is not rerouted over the GEC link when disabling the physical interface on which the traffic is passing. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(26)S1. Workaround: There is no workaround. • CSCed73780 Symptoms: An EPA-GE/FE-BBRD line card may experience repetitive crashes during normal operation.
Resolved Caveats—Cisco IOS Release 12.0(28)S Workaround: There is no workaround. • CSCed77186 Symptoms: The password [encryption-type] password (L2TP) command is lacking the automatic encryption function for nvgen. Conditions: This symptom is observed on a Cisco router when you attempt to configure the password that is used by a provider edge (PE) router for Layer 2 (L2) authentication.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(28)S. Workaround: There is no workaround. • CSCed81415 Symptoms: IS-IS, OSPFv2/OSPFv3 adjacencies, or BGP neighbourships across any of the interfaces of an Engine 2 line card may fail.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: This symptom is observed on a Cisco 12406 that runs the grp-p-mz image of Cisco IOS Release 12.0(28)S and that is configured with dual GRPs and a 4-port OC-12 ATM ISE line card. Workaround: There is no workaround. • CSCed83434 Symptoms: On a line card, the VPN prefixes in one VRF may be attached to another VRF. Conditions: This symptom is observed when more than one VRF is configured in nonalphabetical order and a when an RPR+ switchover occurs.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCed85570 Symptoms: When a POS card is shut down, the show facility status still indicates alarms. When a line card is shut, there should be no alarms for that card. Conditions: This symptom is observed on Cisco 10000 series.a POS line card. Workaround: There is no workaround; ignore the alarms in the show facility status, it is a display error.
Resolved Caveats—Cisco IOS Release 12.0(28)S Workaround: There is no workaround. • CSCed89963 Symptoms: A Cisco 12000 series may experience a block overrun and redzone corruption with a subsequent system reload or switchover as a result of incorrectly processing a corrupted packet.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: This symptom is observed when an IP frame that is smaller than 46 bytes in length comes from an Ethernet interface to an interface of an ATM line card (4OC3/ATM-IR-SC) on a Cisco 12000 series. The router always sets the length in the AAL5 to 54 bytes, as if the IP length is 46 bytes (which is the minimum length of the IP data plus an AAL5 header of 8 bytes). Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: This symptom is observed after a pseudowire virtual circuit is established. Workaround: There is no workaround. • CSCed94042 Symptoms: A transient error may occur on a Cisco 12000 series line card during a network routing change. here is a chance that other line cards in the system will stop transmitting or receiving routing protocol updates and traffic, causing traffic to be blackholed. Conditions: This symptom is observed in an MPLS-VPN network.
Resolved Caveats—Cisco IOS Release 12.0(28)S Workaround: There is no workaround. To restore the router to normal operation, power-cycle the router. • CSCee05224 Symptoms: When you flap an interface that is attached to a L2TPv3 tunnel by entering the shutdown command followed by the no shutdown command or by causing the line protocol to enter the “DOWN/UP” mode, the tunnel enters the “SHUT” mode.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCee12772 Symptoms: On certain platforms (in particular but not limited to a Cisco 800 series), the CNS agents code that captures output for later transmission can crash. Conditions: This symptom is observed on a router that has configuration and EXEC agents and CNS agents that execute CLI commands when you send an XML file to direct these agents to execute a CLI command and return the output (if there is any output).
Resolved Caveats—Cisco IOS Release 12.0(28)S Workaround: Either remove dCEF or remove LFI. (A combination of CEF and MLP is not supported.) Note that if there are two member links in the interleaving-enabled MLP bundle, the problem does not occur. • CSCee24263 Symptoms: A PVC may be inactive and may not come up. Conditions: This symptom is observed when a VC is deleted or removed and you try to recreate the same VC. Workaround: Save the configuration and reload the router.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: The symptom is observed on Cisco 12000 series Engine 3 channelized line cards (OC-48 or 4XOC-12 channelized to DS-3) that functions in an 1+1 APS configuration. However the symptom could occur on any channelized APS interface. Workaround: Enter the shutdown command followed by the no shutdown command on the affected interfaces.
Resolved Caveats—Cisco IOS Release 12.0(28)S • CSCin64927 Symptoms: The xconnect command is not supported on Q-in-Q subinterfaces but the command-line interface (CLI) parser does not prevent you from configuring this command on Q-in-Q subinterfaces. Conditions: This symptom is observed on platforms other than the Cisco 12000 series. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(28)S Workaround: Disable Cisco Express Forwarding (CEF) by entering the no ip cef command. Then, reenable CEF by entering the ip cef distributed command. • CSCuk48156 Symptoms: Failover boot commands from a slot to a disk results in an endless loop. If the router does not find the image in slot0, it will not be able to properly switch to the next image in disk1. Conditions: This symptom occurs when slot0 holds a linear flash card and disk1 holds an ATA disk.
Resolved Caveats—Cisco IOS Release 12.0(28)S First, enter the show ip interface brief EXEC command to display the usability status of interfaces that are configured for IP. The output may look like the following: Interface IP-Address OK? Method Status Protocol Ethernet0/0 172.16.1.1 YES NVRAM up Ethernet1/0 unassigned YES NVRAM administratively down Serial2/0 192.168.2.1 YES NVRAM up up Serial3/0 192.168.3.1 YES NVRAM up up Loopback0 10.1.1.
Resolved Caveats—Cisco IOS Release 12.0(28)S Conditions: This symptom is observed on a Cisco router that is configured with an ATM interface when a packet that contains a virtual circuit descriptor (VCD) that is out range is passed on to the ATM driver of the interface in order to be transmitted. Workaround: There is no workaround. • CSCed29275 Symptoms: IP VRF interfaces that are configured Frame Relay may not work.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 Resolved Caveats—Cisco IOS Release 12.0(27)S5 Cisco IOS Release 12.0(27)S5 is a rebuild of Cisco IOS Release 12.0(27)S. The caveats listed in this section are resolved in Cisco IOS Release 12.0(27)S5 but may be open in previous Cisco IOS releases. This section describes only severity 1 and 2 caveats. Basic System Services • CSCee83917 Symptoms: The RP of a Cisco router may crash when entering the write memory legacy command.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 Conditions: This symptom is observed only in networks where all of the EIGRP neighbors are declared as stub. Workaround: Remove the EIGRP stub feature or clear the IP EIGRP neighbors.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 Conditions: This symptom is observed when the MSDP session flaps while you enter the show ip msdp peer command. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 Further Problem Description: The symptom is very unlikely to occur. The symptom does not occur on a router that has exclusively stub areas and NSSA areas. The symptom may occur when a router does not have exclusively stub areas and NSSA areas. • CSCeg30291 Symptoms: BGP fails to send an update or withdraw message to some peers when these peers have failed to converge properly after an earlier attempt.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 Miscellaneous • CSCeb68673 Symptoms: On an ASBR-PE, the TFIB may be missing a forwarding entry for a prefix that is learnt from a PE. Conditions: This symptom is observed on an "ABSR-co-located PE" (that is, an ASBR that also functions as a PE router) when the PE functionality is removed by deconfiguring VRF, for example, by entering the no ip vrf vrf-name command. Since this is a timing issue, it may occur in Cisco IOS Release 12.0 S, Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 Workaround: There is no workaround. • CSCee18679 Symptoms: When you use snmpget to retrieve information directly from the ifIndex table, the following error message is generated: No Such Instance currently exists at this OID. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(26)S. Workaround: Do not snmpget. Rather, use snmpwalk or snmpgetnext.
Resolved Caveats—Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 (Cause of the failure: PVC removal during recreation failed) Conditions: This symptom is observed when you change the parameters of a VC class while the PVC is active and while you view the PVC status in the output of the show atm vc interface interface-number command.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 • CSCef53109 Symptoms: When you enter the do command with arguments on an interface member of a port-channel or pos-channel group, a message sinmilar to the following one is displayed: Command "do " not allowed on link-bundle member interface Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(28)S when the command is entered on an interface member of a port-channel or pos-channel group.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 The disclosure of these vulnerabilities is being coordinated by the National Infrastructure Security Coordination Centre (NISCC), based in the United Kingdom. NISCC is working with multiple vendors whose products are potentially affected. • CSCef63272 Symptoms: A recursive static default route may not have an outgoing MPLS label, causing all packets to be dropped. Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 • CSCeg12649 Symptoms: On a Cisco router that functions as an egress PE router in an MPLS VPN network, after the customer-facing line card is reloaded, the ingress line card that receives an incoming VPN label with a destination with a glean adjacency (which requires an ARP request) without a BGP session may not properly complete the adjacency, causing traffic to be dropped.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 • CSCeg66282 Symptoms: The controller of a 1-port multichannel STM-1 port adapter (PA-MC-STM1) does not come up after the router has reloaded. Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.0(28)S2. The symptom may also occur in other releases. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 Conditions: This symptom is observed on a Cisco 12416 that runs the c12kprp-p-mz image of a Cisco IOS interim release for Release 12.0(31)S and that is configured with dual PRPs and 4-port OC-12 POS ISE line card that has a service policy attached to each of its interfaces.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 • CSCeh23047 Symptoms: After a manual SSO switchover, traffic in the tag switching-to-IP switching direction between an egress 1-port 10-Gigabit Ethernet Engine 4+ line card and an ingress 4-port Gigabit Ethernet ISE line card does not recover. Conditions: This symptom is observed on a Cisco 12000 series that runs the gsr-p-mz image of Cisco IOS Release 12.0(31)S. Workaround: Reload microcode onto the 4-port Gigabit Ethernet ISE line card.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 Workaround: Reset the standby PRE by entering the hw-module standby-cpu reset command to enable it to reload and come back up properly.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 Conditions: This symptom occurs only if the above (or similar) sequence of adding and deleting subinterface is done. Workaround: Do not delete and re-add the same subinterface. Instead, enter the shut command and then the no shut command. The same effect is achieved without running into the above symptom.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 Workaround: There is no workaround. Note that the symptom does not occur when SSO is configured because the MLP state is maintained. • CSCin88273 Symptoms: After an RPR+ or SSO switchover occurs, an MLP sequence number mismatch may occur, a ping between back-to-back interfaces may not go through, and the routing protocol through this link may go down. Conditions: This symptom is observed on a Cisco 7500 series that is configured for dMLP and RPR+ or SSO.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 • CSCsa49740 Symptoms: Packets are punted to the GRP at a rate of 5000 pps, causing the CPU utilization of the CPU to reach more than 50 percent. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(26)S3 when a 4-port Packet-over-SONET OC-48c Engine 4 plus line card (4OC48E/POS-SR-SC=) receives TCP packets with destination 0.0.0.0. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 Workaround: Manually remove the export map from the new active RP. • CSCsa58340 Symptoms: Upon entering the police command, the router reloads unexpectedly. Conditions: The reload occurs if the policy map being edited already contains the maximum number of classes that the Cisco 10000 supports and the user attempts to add one more class with police. Workaround: Avoid using policy maps that contain more classes than what the Cisco 10000 supports.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 • CSCsa65732 Symptoms: When you remove a policy map from a subinterface, the subinterface may become stuck, preventing traffic from passing through the subinterface. Conditions: This symptom is observed on a Cisco 10000 series that runs Cisco IOS Release 12.0(25)SX7 when a nested policy map is applied to the main or physical interface in addition to the one that is already applied to the subinterface. The symptom could also occur in Release 12.0S.
Resolved Caveats—Cisco IOS Release 12.0(27)S5 When an LSP traceroute is invoked and a transit router replies with a downstream map TLV that contains a multipath length field that is set to a length shorter than four bytes, existing implementations handle this situation incorrectly and cause memory packet memory to become corrupted during the subsequent attempt to build an MPLS echo request packet. This situation eventually causes the router to crash.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Resolved Caveats—Cisco IOS Release 12.0(27)S4 Cisco IOS Release 12.0(27)S4 is a rebuild of Cisco IOS Release 12.0(27)S. The caveats listed in this section are resolved in Cisco IOS Release 12.0(27)S4 but may be open in previous Cisco IOS releases. This section describes only severity 1 and 2 caveats. Basic System Services • CSCdz61503 Symptoms: A Cisco router may reload when it performs Simple Network Management Protocol (SNMP) Notification Log MIB queries.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Conditions: This symptom is observed when you enter the rtr responder command for the first time and you do not reload the router. Workaround: Reload the router after you have entered the rtr responder command.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.0(26)S1 when you attempt to configure the interface and bring it up. Workaround: There is no workaround. • CSCef79968 Symptoms: When an snmpget is executed for an interface index below .1.3.6.1.2.1.31.1.1.1.6, the router responds with the following information: ifMIB.ifMIBObjects.ifXTable.ifXEntry.ifHCInOctets.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 • CSCee35125 Symptoms: A Cisco router may crash when you enter the clear ip route * command. Conditions: This symptom is observed when the routing table has a default route. Workaround: There is no workaround. • CSCee67450 A Cisco device running Cisco IOS and enabled for the Border Gateway Protocol (BGP) is vulnerable to a Denial of Service (DoS) attack from a malformed BGP packet.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Workaround: Enter the mpls traffic-eng tunnels interface configuration command on the outbound interface of the Cisco router. Then, enter the shutdown interface configuration command followed by the no shutdown interface configuration command on this interface, and save the configuration. • CSCef92863 Symptoms: A Cisco 10000 PRE-1 may reload when a VRF that is configured with eight maximum paths is modified.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Workaround: There is no workaround. • CSCed82964 Symptoms: L2 loadbalancing might be affected on an egress link bundle. Conditions: This symptom is observed a Cisco 12000 series when the ingress interface is a regular Engine 2 interface and when the member interfaces in the bundle are toggled. Workaround: Enter the config mode of the port channel and exit.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Workaround: Run LDP in the MPLS core for all interfaces that have auto-tunnel traffic engineering configured. • CSCee32365 Symptoms: When a single bundle link associated with a Multilink Frame Relay (MFR) interface is brought up, LMI exchanges over the MFR interfaces may not happen. Conditions: This symptom is observed on a Cisco 7500 series that is configured for MFR. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 • CSCee69887 Symptoms: A dual SRP ring fails to become active completely due to an is-type mismatch. The output of the show clns neighbors command indicates that a certain system interface remains in the “Init” state indefinitely, although the output of the show ip interface brief command shows that this interface is up. Conditions: This symptom is observed when a dual SRP ring is configured on three routers that run Cisco IOS Release 12.2S.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Conditions: The symptom is observed in a rare situation when label distribution protocol (LDP) is used in configurations with a very large number of numbered interfaces. When this problem occurs, the output of the show process cpu sorted command shows that the “Tagcon Addr” process consumes the majority of the CPU cycles. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(26)S or a later release when the resolved ARPs are deleted, for example, when routers flap, when BGP peers do not respond, or when you enter the clear arp command. Note that the symptom may also occur on releases earlier than Release 12.0(26)S.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Conditions: This symptom is observed on a Cisco 12012 that is configured for SSH but may occur on any Cisco platform that is configured for SSH. Workaround: There is no workaround. • CSCef53169 Symptoms: An outbound ACL with a log/log-input keyword changes the IP destination address in the packets. As the result, packets that should be permitted are incorrectly denied. Conditions: This symptom is observed on a Cisco platform that runs Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 • CSCef67267 Symptoms: The Fast ReRoute database shows all prefixes in the active state. Conditions: This symptom is observed on a Cisco router after a connected point of local repair (PLR) has rebooted. Workaround: Enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the interface on which the primary tunnel is configured. Doing so restores the prefixes to the ready state.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 • CSCef72305 Symptoms: A standby PRE crashes on bootup. Conditions: This symptom is observed on a Cisco 10000 series that is configured with 1000 ATM VCs when a forced SSO switchover occurs. Workaround: There is no workaround. • CSCef72411 Symptoms: Line cards and the standby RP on a Cisco 12000 series may fail when an RP switchover occurs. Conditions: This symptom is observed on a Cisco 12000 series that runs a Cisco IOS interim release for Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Conditions: This symptom is observed when the headend of the TE tunnel is a third-party router that has the no cspf command configured for the label switched path (LSP) and when the tunnel midpoint is a Cisco router that runs Cisco IOS Release 12.0(25)S1. The symptom occurs when the link downstream (that is, towards the tailend of the tunnel) on the Cisco router fails because the interface on either side of the link is shut down.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 • CSCef89562 Symptoms: An Engine 4+ EPA-GE/FE-BBRD line card reports “%TX192-3-PAM_MODULE” and “%TX192-3-PAM_PIM” errors, and the interfaces continue to flap with the following error message: %GRPGE-6-INVALID_WORD: Interface GigabitEthernet15/1/0: Detected RX Invalid Word When there is heavy traffic, the line card may crash without generating any crashinfo. Conditions: These symptoms are observed on a Cisco 12000 series that runs Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Workaround: There is no workaround. • CSCef94619 Symptoms: A VIP may crash while forwarding packets or a watchdog timeout crash may occur on the VIP during statistics collection. Conditions: This symptom is observed on a Cisco 7500 series that is configured with an RSP4 and that runs Cisco IOS Release 12.0(26)S4. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Conditions: This symptom is observed when the ingress line card is an Engine 4+ DPT line card and the egress line card is any Engine 4+ line card. Workaround: There is no workaround. • CSCeg00252 Symptoms: When you enter the show sec-disk0: command or the execute-on slot slot-number command command on the standby RP, no command output is generated.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 • CSCeg03180 Symptoms: A line card in slot 15 is stuck in the WAITRTRY state. Conditions: This symptom is observed on a Cisco 12816 that is configured with dual RPs when an RP switchover followed by a CSC switchover occurs. Workaround: Reload the router. Alternate Workaround: Power down and power up the router.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 Because the distribute-list interface command is not implemented in the IPv4 VRF address-family, there is no other way to filter networks received in updates via a VRF interface. Conditions: This symptom is observed in all Cisco IOS releases that integrate the fix for CSCee32557. A list of the affected releases can be found at http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCee32557.
Resolved Caveats—Cisco IOS Release 12.0(27)S4 • CSCin82862 Symptoms: Multicast traffic is not switched from a multilink interface on a Cisco 7500 series that is configured for distributed multilink PPP (MLP). Conditions: This symptom is observed when the router is reloaded or when the multilink interface flaps. Workaround: Enter the clear ip mds linecard * command on the Route/Switch Processor (RSP). • CSCin83445 Symptoms: Incoming multicast traffic on a distributed MLP link is process-switched.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Resolved Caveats—Cisco IOS Release 12.0(27)S3 Cisco IOS Release 12.0(27)S3 is a rebuild of Cisco IOS Release 12.0(27)S. The caveats listed in this section are resolved in Cisco IOS Release 12.0(27)S3 but may be open in previous Cisco IOS releases. This section describes only severity 1 and 2 caveats.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCed33110 Symptoms: A VIP crash may cause memory exhaustion on an RSP, which in turn may cause the RSP to crash. Conditions: This symptom is observed more frequently on routers with a high IDB count. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Workaround: Prevent the MIB from being polled by explicitly configuring an SNMP view in the Cisco IOS configuration.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCee47714 Symptoms: Entering the shutdown command on a controller of a Packet over T1/E1 Network Transceiver puts the controller permanently down. Entering the no shutdown command on the controller does not bring the controller up. Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.0 S and is specific to the controller that is installed in a PA-MC-8T1/E1, PA-MC-4T1/E1, or PA-MC-2T1/E1 port adapter.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCed53358 Symptoms: Pings fail on an Ethernet-to-VLAN interworking over L2TPv3 due to an IRDP failure. Conditions: This symptom is observed when you ping between two CE routers. Both of the CE routers do not learn each other’s MAC address automatically. Workaround: Ping from the first CE router to the second CE router, then ping from the second CE router to the first CE router.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCee36721 Symptoms: An OSPF Designated Router (DR) may fail to regenerate the network LSA when you reload the router. Conditions: This symptom is observed on a Cisco router that functions as a DR for an OSPF interface when another interface with the same interface address is present in the area but is in a shut down state. Workaround: Remove the duplicate interface address and enter the clear ip ospf process command.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 BGP routing table entry for 200:2:192.168.0.0/32, version 54 Paths: (2 available, best #1, table vpn2) Flag: 0x820 Advertised to non peer-group peers: 10.10.10.10 10.20.20.20 2 10.4.1.2 from 10.4.1.2 (10.4.1.2) Origin IGP, localpref 100, valid, external, best Extended Community: RT:1:2 2 100, imported path from 200:2:172.16.0.0/24 10.1.1.2 from 10.1.1.2 (10.1.1.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Conditions: This symptom is observed when the RP for a group fails and an incoming (*,G) join message is received. MSDP should create an (S,G) state from its SA cache. However, this is done before the (*,G) olist is populated; because of the (*,G) NULL olist, MSDP does not install an (S,G) state.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 – Cisco IOS Release 12.1E – Cisco IOS Release 12.2M Workaround: Avoid conditions that prevent a “valid cached adjacency” from being installed. • CSCec11645 Symptoms: VIP crashes with DMA Receive error. Conditions: This symptom can occur when doing xconnect hairpinning of two interfaces on the same VIP. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 UBR7100, Cisco UBR7200 - all NPEs, Cisco 7301, Cisco 7304, Cisco 7400, Cisco 6500 MSFC, Cisco 6500 MSFC2, Cisco 7600 MSFC, Cisco 7600 MSFC2, Cisco 10000, Cisco UBR10012, Cisco 12000 GRP, Cisco and most (if not all) 12000 line cards.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 4) Symptoms: There are two symptoms: – There may be a duplicate entry for each file when you enter the show diskslot-number command. – An snmpGet on a ciscoFlashFileSize object may enter a loop. Conditions: This symptom is observed on a router that runs Cisco IOS Release 12.3 T after the router boots up. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCed69546 Symptoms: When mixed channels are defined on a channelized OC-12 line card and these channels include DS3s, T1s, an DS0s, CEF/RIB inconsistency may occur, preventing traffic to be sent over the correct interfaces. Conditions: This symptom is observed on a Cisco 10000 series.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCed82592 Symptoms: A PXF engine on a Cisco 10000 series may unexpectedly crash and then the router may crash. Conditions: This symptom is observed on a Cisco 10000 series that runs Cisco IOS Release 12.0(23)S5. Workaround: There is no workaround. • CSCed92837 Symptoms: After a Stateful Switchover (SSO) occurs on a Cisco 7500 series, the standby Route Switch Processor (RSP) my hang just before downloading the image.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCee14817 Symptoms: HSRP over the VRF is not working after following these steps: 1. PE router 1 is the active HSRP router and a redundancy forced switchover occurs on PE router 2 (standby HSRP VPN) with SSO configured. 2. You enter the shutdown command on the GE subinterface of PE router 1. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCee24349 Symptoms: A Cisco 7500 series cannot boot when there are more than 256 different policy maps attached as service policies on the router. Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.0(26)S1 but may also occur in Release 12.2 S. Workaround: Do not use more than 256 service policies. • CSCee25588 Symptoms: A 12000 series Engine 2 line card may not accept a “tx-cos” configuration.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCee31618 Symptoms: Buffer leakage could occur when a high load of traffic is sent to an interface that has a service policy enabled. This could result in ping failures or very long packet delay. Conditions: The problem is observed with an MC-T3+ interface that is configured in unchannelized mode, and the traffic consists only of small packets such a 64-byte packets.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCee38348 Symptoms: The SNMP counters and CLI for Frame Relay subinterfaces may be incorrect. Conditions: This symptom is observed a Cisco 12000 series with ISE POS line cards. Workaround: There is no workaround. • CSCee38942 Symptoms: EoMPLS tunnels do not have labels assigned to them, preventing a virtual circuit from coming up. Conditions: This symptom is observed when multiple (for example, 1200) EoMPLS tunnels are configured.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Workaround: There is no workaround. • CSCee43569 Symptoms: The TE DB on a tunnel headend may become corrupted. Conditions: This symptom is observed on a Cisco router that has MPLS configured. Workaround: There is no workaround. • CSCee43880 Symptoms: After reloading an E2 16-port OC-3 POS line card that is a member line card of POS channel, the peer POS channel members do not become active members again.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCee57485 Symptoms: There are two symptoms: – Packets with explicit null labels may be dropped from an Engine 4+ POS line card. – CEF may become disabled on an Engine 4+ POS line card. Conditions: These symptoms are observed on a Cisco 12000 series under the following conditions: – The router functions as a PE router with the Engine 4+ POS line card facing the core and performing MPLS disposition. – VRFs are configured on the router.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Conditions: This symptom is observed on a Cisco 12000 series when multicast and unicast traffic are running through the Engine 6 line card. Workaround: There is no workaround. • CSCee65004 Symptoms: A 1-port 10-Gigabit Ethernet line card (1X10GE-LR-SC) may crash, reporting %TX192-3-CPUIF errors. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Conditions: This symptom is observed on a Cisco platform that functions in an MPLS OAM environment. Workaround: There is no workaround. • CSCee70478 Symptoms: If hardware multicast forwarding is enabled on an Engine 2 line card that is connected to the source of multicast traffic, multicast traffic may not be forwarded after the router has reloaded.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Workaround: Remove the xconnect destination-address vc-id encapsulation mpls command from the (sub)interface that connects to a customer device, and reconfigure it on the (sub)interface.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Conditions: This symptom is observed on a Cisco 10720 that runs Cisco IOS Release 12.0(26)S or a later Cisco IOS Release 12.0 S release, all of which contain IPv6 PXF packet forwarding functionality, and is most likely to occur while IPv6 packets are passing through the router. Workaround: Disable IPv6 functionality or disable PXF by entering the no service pxf command.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCee82088 Symptoms: The show controller au-4 command does not show any detail tug groups under the controller. Conditions: The symptom was observed on the Cisco 10000 router with a channelized STM-1 linecard. Workaround: Issuing the following commands on the router will restore the au-4 controller display.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Workaround: The potential workarounds include the following: – Reduce the number of QoS policy attachments. – Avoid polling the unsupported stats table(s). – Reduce the polling frequency.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Conditions: This symptom is observed when a GRE tunnel between two routers is up and you ping from the GRE interface of one router to the GRE interface of the other router. Workaround: There is no workaround. • CSCef08774 Symptoms: Certain types of fragmented packets are dropped when the ingress line card is an E6 line card and the egress line card is an E4+ line card. (CSCed22100 addresses this symptom for the E4+ line card.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 • CSCef16326 Symptoms: When you remove a policy map from a subinterface, the subinterface may become stuck, preventing traffic from passing through the subinterface. Conditions: This symptom is observed on a Cisco 10000 series that runs Cisco IOS Release 12.0(25)SX7 when a nested policy map is applied to the main or physical interface in addition to the one that is already applied to the subinterface. The symptom could also occur in Release 12.0S.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 – In the output of the show hard pxf cpu statistics interface srp 1/1 detail command, the “zero encap length” counter increases. Conditions: This symptom is observed when all of the following conditions are present: – A packet enters with or without an MPLS label. – The router tries to send an ICMP packet to the source in any of the following situations: * The packet is denied by an output security ACL. * There is no route in the router to forward the packet.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 FAIL REASON = retry queue flush %LCINFO-3-CRASH: Line card in slot 4 crashed Conditions: The symptom is seen when the ciscoOpticalMonitoringMIB is polled on a router running Cisco IOS Release 12.0(27)S1. The card that crashes does not have to be the card that is being polled. For example, an OC192E/POS-VSR in slot 0 may be polled with 1.3.6.1.4.1.9.10.83.1.1.1.1.8.2 and the OC192E/POS-IR-SC in slot 4 may crash.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 3. Modify each defined community string to include the view nolsrmib keywords. For example, define the “public” community string by entering the following command: snmp-server community public view nolsrmib ro 4. • Enter the no shutdown interface configuration command on all the interfaces that you shut down in Step 1. CSCef37716 Symptoms: An LSP ping may not interoperate with third-party vendor equipment.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Workaround: There is no workaround. • CSCef41460 Symptoms: GRE tunnel may not work on a PE router if VPN is configured. Conditions: This symptom is observed on a Cisco 12000 series that runs the gsr-p-mz image of Cisco IOS Release 12.0(25)S or a later release. Workaround: There is no workaround • CSCef42706 Symptoms: CPUHOG conditions, BGP sessions flaps, and APS channels flaps are observed on a router.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Workaround: Attach a policy-map to the interface with random-detect enabled. • CSCef45609 Symptoms: An Engine 3, QOC12 LC configured with Multicast VPNs, may punt traffic to RP if multicast is disabled using the no ip multicast-routing distributed command and then re-enabled using the no ip multicast-routing distributed command. Conditions: This symptom is observed on a Cisco 12000 series that is running the gsr-p-mz image of any Cisco IOS Release from 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S3 Conditions: This symptom occurs after an SSO switch over traffic stopped for interfaces having both input and output policy attached. Workaround: Remove and reattach the policy to the interface. • CSCin24544 Symptoms: A permanent virtual connection (PVC) configuration is removed if a PVC fails when it is recreated. Conditions: This symptom is observed on a Cisco 7500 series that has a Versatile Interface Processor (VIP).
Resolved Caveats—Cisco IOS Release 12.0(27)S3 This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20050412-icmp.shtml. The disclosure of these vulnerabilities is being coordinated by the National Infrastructure Security Coordination Centre (NISCC), based in the United Kingdom. NISCC is working with multiple vendors whose products are potentially affected.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Resolved Caveats—Cisco IOS Release 12.0(27)S2 Cisco IOS Release 12.0(27)S2 is a rebuild of Cisco IOS Release 12.0(27)S. The caveats listed in this section are resolved in Cisco IOS Release 12.0(27)S2 but may be open in previous Cisco IOS releases. This section describes only severity 1 and 2 caveats.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Workaround: Configure the neighbor device to use less than a 256 character hostname, or disable the CDP process with the global command no cdp run. Interfaces and Bridging • CSCec87736 Symptoms: TX Simple Network Management Protocol (SNMP) counters do not update on Fast Ethernet subinterfaces for distributed Cisco Express Forwarding (dCEF) traffic. Conditions: This symptom is observed on Cisco IOS Release 12.0(26)S and Release 12.3.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCed70979 Symptoms: A router may reload unexpectedly with a bus error and/or display spurious memory access messages. Conditions: This symptom is observed when the router is configured for OSPF and is actively learning OSPF routes dynamically. Workaround: There is no workaround. • CSCed75295 Symptoms: FRR LSPs may fail to provide protection with a Next-next-hop (NNHOP) backup tunnel.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCee42285 Symptoms: Non-EIGRP originated routes are not supported. Furthermore, when a route is injected into mp-BGP from a connected, static, or any other IGP on the remote PE router where the same prefix is also learned via EIGRP (when a backdoor exists for that site), the route may constantly flap between EIGRP and BGP. Conditions: These symptoms are observed when the EIGRP MPLS VPN PE-CE SoO feature is configured.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Conditions: This symptom is observed on a Cisco router when you enter both ip global configuration commands and the cns config notify diff global configuration command to capture commands that change configuration for the config-changed event output. Workaround: Enter the all keyword in the cns config notify global configuration command. This workaround is not valid when the only changes in the configuration occur in the config-changed event output.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Conditions: This symptom is only observed on an MPLS-capable Cisco platform and only when the label space has been exhausted to the maximum level supported by the platform or is about to be exhausted (only a few hundred labels are available) and when the TFIB table is expanded further. Workaround: Enter the mpls label range 16 101900 command at the conf-t level to avoid the error messages.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Workaround: There is no workaround. The fix for this DDTS adds the new show monitor event-trace psar command to show any bursty error events that are traced but not visible in the output of the show logging command. • CSCed15913 Symptoms: An Engine 0 12xE3 line card may reload when changing the MTU on an Engine 2 3x1GE line card. Conditions: This symptom is observed on a Cisco 12416 router that is running the gsr-p-mz image of Cisco IOS Release 12.0(26)S.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCed30253 Symptoms: WRED classification may fail. Conditions: This symptom is observed when you configure WRED and pass traffic. Workaround: There is no workaround. • CSCed32758 Symptoms: A reload or online insertion and removal (OIR) of any line card on a Cisco 12000 series Internet router chassis with a 1+1 Automatic Protection Switching (APS) configuration between two CHOC-48 line cards may cause a “deadman timer expired” error.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCed46184 Symptoms: VPN sessions may not be established. Conditions: This symptom is observed in an Xconnect configuration when a CFI interface goes down after the VPN service is being established. This is a timing issue. Workaround: Remove and reconfigure Xconnect.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCed51371 Symptoms: Intermittent packet drops occur when you ping the VRF loopback/interfaces on a PE router from an attached PE router. The VPN transit traffic intermittent drops occur also on packets that exceed the MTU size. Conditions: This symptom is observed on a Cisco 12000 series 3-port GE and 4-port GE line card that are installed in a Cisco router that functions as a PE router and that is connected to another PE router via an L2 switch.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCed54262 Symptoms: Memory allocation (MALLOC) failures may occur on a VIP, port adapter, or line card. Conditions: This symptom is observed on a Cisco router that has a scaled AToM configuration. Workaround: There is no workaround. • CSCed56025 Symptoms: A VIP, port adapter, or line card may reset. Conditions: This symptom is observed on a router that has a scaled AToM configuration. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCed57925 Symptoms: The cisco.mgmt.cns.config-changed event message does not get generated when atm pvc CLIs are configured. Conditions: This may occur when the CNS configuration notify agent is configured by the cns config notify configuration command and atm pvc CLIs are configured. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Also, it is observed that the controller is reset when the following is removed/reapplied: rx-cos-slot all ToFabTable ! slot-table-cos ToFabTable destination-slot 0 OC3 destination-slot 1 GIGE Conditions: This symptom is observed on a Cisco 12000 series router. Workaround: Perform the following steps: • 1. Remove the RED configuration. 2.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Conditions: This symptom is observed on Engine 3 line cards that are installed in a Cisco 12000 series that runs Cisco IOS Release 12.0(25)S1 or a later release. Workaround: There is no workaround. • CSCed70822 Symptoms: With four fabric cards (one CSC in slot 16 and three SFCs), after a power cycle, the line cards fail to come up and fabric ping timeouts occur. Conditions: This symptom is observed on a Cisco 12000 series and affects all E4 and E4+ cards.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCed73722 Symptoms: On an Engine 3 4GE line card, traffic from a Catalyst switch to a Cisco 12000 series is not rerouted over the GEC link when disabling the physical interface on which the traffic is passing. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(26)S1. Workaround: There is no workaround. • CSCed73780 Symptoms: An EPA-GE/FE-BBRD line card may experience repetitive crashes during normal operation.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0(27)S. Workaround: There is no workaround. • CSCed77178 Symptoms: HSRP configured on the subinterfaces of an Engine 4+ GE line card may not work. Conditions: This symptom is observed when the subinterfaces are configured with VRFs. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Conditions: This symptom is observed after a manual RP switchover in RPR mode. Workaround: There is no workaround. • CSCed83256 Symptoms: A Cisco 12000 series may hang when you enter the no shutdown or atm ilmi-pvc command. Conditions: This symptom is observed on a Cisco 12406 that runs the grp-p-mz image of Cisco IOS Release 12.0(28)S and that is configured with dual GRPs and a 4-port OC-12 ATM ISE line card. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCed85570 Symptoms: When a POS card is shut down, the show facility status still indicates alarms. When a line card is shut, there should be no alarms for that card. Conditions: This symptom is observed on Cisco 10000 series.a POS line card. Workaround: There is no workaround; ignore the alarms in the show facility status, it is a display error.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCed89629 Symptoms: A VIP4-80 may crash when you enter the police command for a policy map that is applied to an ATM subinterface PVC in the input direction. Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.0(26)S or 12.0(27)S. Workaround: Do not enter the police command for a policy map that is applied to an ATM subinterface PVC.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCed91338 Symptoms: An ATM device that is connected to a Cisco 12000 series may cause a communication failure because of a length mismatch between the ATM adaption layer 5 (AAL5) and the IP data length. Conditions: This symptom is observed when an IP frame that is smaller than 46 bytes in length comes from an Ethernet interface to an interface of an ATM line card (4OC3/ATM-IR-SC) on a Cisco 12000 series.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 EnteredCmd: exit NewConfig#: OldConfig#: ! MyPolicy test TEST2 description TESTTEST class m_new shape peak 8010 priority Conditions: This may occur when the CNS configuration notify agent is configured by the cns config notify configuration command and policy-map CLI is configured on the Cisco IOS device. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCee04454 Symptoms: A Cisco 10000 series router reloads unexpectedly as ATM VCs are coming up. Conditions: This symptom is believed to occur only when ACLs are applied on ATM interfaces, and, only rarely then, on images that contain the CSCed72686 fix. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Conditions: This symptom is observed when LFI is enabled with one member link in the MLP bundle. Workaround: Either remove dCEF or remove LFI. (A combination of CEF and MLP is not supported.) Note that if there are two member links in the interleaving-enabled MLP bundle, the problem does not occur.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Workaround: There is no workaround. • CSCee30089 Symptoms: If a multilink interface loses members of the bundle, or if you enter the shutdown command followed by the no shutdown command on a multilink interface, or if the router reloads, the bandwidth that is allocated for non-real time classes can be allocated incorrectly.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Conditions: This symptom observed on a Cisco 12000 series when there are link-bundle subinterfaces configured on the 4-port ISE Gigabit Ethernet line card. A list of the affected releases can be found at http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCed63480. Cisco IOS software releases that are not listed in the “First Fixed-in Version” field at this location are not affected. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 • CSCee57438 Symptoms: The second port pair (interface SRP x/1) of an Engine 4+ 4-port OC-48 DPT line card is unable to forward traffic (including pings) at layer 3. The first port is also damaged (interface SRP x/0); a portion of its forwarding capabilities is damaged. The layer 2 SRP protocol operates correctly. Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S2 Conditions: This symptom is observed when a policy is attached to the interface. Workaround: There is no workaround. • CSCin74347 Symptoms: Outbound security ACLs are not applied properly on Cisco10000 series routers. Conditions: This symptom is observed on all Cisco IOS Release 12.0 S images that contain the fix for CSCed72686. Workaround: There is no workaround. • CSCuk48013 Symptoms: A Cisco 7500 series router that is running 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S1 access-list 177 deny tcp any host 172.16.1.1 eq 544 access-list 177 deny tcp any host 192.168.2.1 eq 514 access-list 177 deny tcp any host 192.168.2.1 eq 544 access-list 177 deny tcp any host 192.168.3.1 eq 514 access-list 177 deny tcp any host 192.168.3.1 eq 544 access-list 177 deny tcp any host 10.1.1.1 eq 514 access-list 177 deny tcp any host 10.1.1.
Resolved Caveats—Cisco IOS Release 12.0(27)S1 Interfaces and Bridging • CSCed47550 Symptoms: BGP Policy Accounting information is not available via SNMP for 802.1Q VLAN subinterfaces. Conditions: This symptom is observed on Cisco 12000 and 7500 series routers. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S1 Miscellaneous • CSCeb22276 Symptoms: Some Simple Network Management Protocol (SNMP) packets may linger in the input queue while they are processed. However, the packets do exit the queue on their own without any intervention from the user. This fix allows these packets to be removed from the queue more quickly. Conditions: This symptom is observed on a device that runs Cisco IOS software and that supports SNMP operations.
Resolved Caveats—Cisco IOS Release 12.0(27)S1 Workaround: There is no workaround. • CSCed08696 This umbrella caveat affects the behavior of path triggers, and of Automatic Protection Switching (APS) with PPP and Frame Relay (FR) encapsulation. - CSCec70879: Symptoms: Cisco 12000 series POS APS interfaces do not permit the configuration of path trigger specifications on APS interfaces. Conditions: This symptom is observed on a Cisco 12000 series router. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S1 C 1::/64 [0/0] L 1::2/128 [0/0] C 2::/64 [0/0] L 2::1/128 [0/0] B 2001::/16 [200/0] B 2002::/16 [200/0] L FE80::/10 [0/0] L FF00::/8 [0/0] via ::, Ethernet0/0 via ::, Ethernet0/0 via ::, Ethernet1/0 via ::, Ethernet1/0 via 2002::1 via 2001::1 via ::, Null0 via ::, Null0 Note that 2001::/16 and 2002::/16 results in a recursion loop because 2001::/16 is accessible via 2002::/16 and 2002::/16 is accessible via 2001::/16.
Resolved Caveats—Cisco IOS Release 12.0(27)S1 Workaround: Reload the router and reconfigure traffic- shape. • CSCed33627 Symptoms: A 3-port Gigabit Ethernet (GE) line card may show BMA error, then run error recovery. Conditions: This symptom is observed on a Cisco 12008/40 router that is running Cisco IOS 12.0(23)S5. It is configured as an MPLS inter-AS ASBR. It is also configured as a PE router.
Resolved Caveats—Cisco IOS Release 12.0(27)S1 Workaround: Reload the secondary RP. • CSCed43829 Symptoms: Random Early Detection maintains an average length of the outbound queue of a class of traffic, and randomly discards newly arriving packets when the average falls within the configured range.
Resolved Caveats—Cisco IOS Release 12.0(27)S1 • CSCed50510 Symptoms: An IPC crash may be seen on a standby RP while upgrading from the gsr-p-mz image of Cisco IOS Release 12.0(25)S1 to the gsr-p-mz image of Cisco IOS Release 12.0(27)S. Tracebacks and error messages “%IPCGRP-3-UNKNOWNCMDMSG:” and “%IPCGRP-3-SYSCALL:” may be seen as well. Conditions: This symptom is observed on a Cisco 12416 router when following the recommended upgrade procedure. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S1 • CSCed68575 Cisco Internetwork Operating System (IOS) Software releases trains 12.0S, 12.1E, 12.2, 12.2S, 12.3, 12.3B and 12.3T may contain a vulnerability in processing SNMP requests which, if exploited, could cause the device to reload. The vulnerability is only present in certain IOS releases on Cisco routers and switches. This behavior was introduced via a code change and is resolved with CSCed68575. This vulnerability can be remotely triggered.
Resolved Caveats—Cisco IOS Release 12.0(27)S Resolved Caveats—Cisco IOS Release 12.0(27)S All the caveats listed in this section are resolved in Cisco IOS Release 12.0(27)S. This section describes only severity 1, severity 2, and select severity 3 caveats. Basic System Services • CSCdw85004 Symptoms: The Response Time Reporter (RTR) uses random User Datagram Protocol (UDP) ports to respond to Service Assurance Agent (SAA) probes. Conditions: This symptom is observed on a Cisco router.
Resolved Caveats—Cisco IOS Release 12.0(27)S Note: If the nvram:ifIndex-table file is created by software (because of the snmp-server ifindex persist configuration command), there should be no problem in the format of the file. There is no need to delete the file if you see it and if the switch is running and booting smoothly. • CSCeb66973 Symptoms: A Cisco router or switch may reload when it attempts to read the ifIndex information from an NVRAM file during the bootup process.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: This symptom is observed on a Cisco 7500 series router when Multilink PPP (MLP) is configured on the serial interface and distributed Cisco Express Forwarding (dCEF) switching is enabled. Workaround: There is no workaround. • CSCea66198 Symptoms: A Cisco 7500 series router may encounter a bus error when applying a crypto map on an FDDI interface. Conditions: This symptom is observed on a Cisco 7500 series router that is running Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S Workaround: There is no workaround. • CSCin53729 Symptoms: Poor performance is observed when the ATM packed cell relay feature is configured in virtual path (VP) mode. Conditions: This symptom is observed when a large number of VPs are configured on a PA-A3 port adapter and the packed cell relay feature is enabled on all of the VPs. Workaround: There is no workaround. Cross-Platform Release Notes for Cisco IOS Release 12.0S 1366 OL-1617-14 Rev.
Resolved Caveats—Cisco IOS Release 12.0(27)S IP Routing Protocols • CSCdw75860 Symptoms: There is inoperability between Cisco IOS Release 12.2 and earlier releases when you configure an invalid encrypted password for Message Digest 5 (MD5) authentication for Open Shortest Path First (OSPF). An error message similar to the following is displayed to warn the user of this invalid password.
Resolved Caveats—Cisco IOS Release 12.0(27)S Workaround: There is no workaround. Note that the old LSP times out after five minutes. • CSCea66336 Symptoms: A Cisco router may be unable to set up a Frame Relay or an ATM permanent virtual connection (PVC). When you enter the debug ip rsvp traffic-control EXEC command, the following message is displayed: RSVP-TC: Unable to determine resource provider for tcsb Conditions: This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2(15)T.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCeb53391 Symptoms: Border Gateway Protocol (BGP) may not advertise all routes to a peer. Conditions: This symptom is observed when the peer comes up after all other peers of an update group have converged. Workaround: There is no workaround. • CSCeb53542 Symptoms: An inconsistency between the Cisco Express Forwarding (CEF) table and the Address Resolution Protocol (ARP) table may cause CEF entries to be removed and then recreated at random times.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCeb60432 Symptoms: If an object in a Resource Reservation Protocol (RSVP) reservation (RESV) refresh changes in relation to the previous refresh, a debug message may be generated that is not subjected to an access control list (ACL). When many flows or label switched paths (LSPs) are active on a router, this situation may cause so much debug output that the router may pause indefinitely or reload.
Resolved Caveats—Cisco IOS Release 12.0(27)S Workaround: There is no workaround. • CSCeb85136 Symptoms: An IP packet that is sent with an invalid IP checksum may not be dropped. Conditions: This symptom is observed if the IP checksum is calculated with a decreased time-to-live (TTL) value. For example, in the situation where the IP checksum must be 0x1134 with a TTL of 3, if the packet is sent with an IP checksum of 0x1234 that is calculated by using a TTL value of 2, the packet is not dropped.
Resolved Caveats—Cisco IOS Release 12.0(27)S The vulnerability is only present in IOS release trains based on 12.0S, 12.2, and 12.3. Releases based on 12.0, 12.1 mainlines and all IOS images prior to 12.0 are not affected. Refer to the Security Advisory for a complete list of affected release trains. Further details and the workarounds to mitigate the effects are explained in the Security Advisory which is available at the following URL: http://www.cisco.com/warp/public/707/cisco-sa-20040818-ospf.shtml.
Resolved Caveats—Cisco IOS Release 12.0(27)S – A VRF OSPF process is parsed, but no router ID is available for the process. Workaround: There is no workaround. • CSCec33773 Symptoms: When a path is added to or deleted from the transit area between two virtual link routers that function as virtual link endpoints, the routes that are learned from the network backbone may not be updated in the routing table.
Resolved Caveats—Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: This symptom is observed on a Cisco router that receives excessive multicast control traffic. Workaround: Apply a quality of service (QoS) policy map to limit the rate of the multicast control traffic that can be received by the router. • CSCec68467 Symptoms: The memory usage of the Open Shortest Path First version 3 (OSPFv3) process may increase unexpectedly.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCin51310 Symptoms: You may not be able to configure the ip vrf receive interface configuration command. Conditions: This symptom is observed when the interface on which you attempt to configure the ip vrf receive interface configuration command does not have an IP address configured. Workaround: First configure an IP address on the interface, then enter the ip vrf receive interface configuration command on the interface.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: This symptom is observed on a Cisco 7200 series and a Cisco 7500 series when there is a large routing table and the ip router isis interface configuration command is configured on the router. Workaround: Remove the ip router isis interface configuration command from the router, and then enter the no router isis global configuration command.
Resolved Caveats—Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCea29102 This caveat consists of two symptoms, two conditions, and two workarounds: 1. Symptoms: A Route Processor (RP) may reload when you enter the clear ip bgp * privileged EXEC command while interfaces flap continuously. Conditions: This symptom is observed when Virtual Private Network (VPN) routing/forwarding (VRF) forwarding is configured on the interfaces that flap. Workaround: There is no workaround. 2.
Resolved Caveats—Cisco IOS Release 12.0(27)S – Errors occur when data is stored on or read from the ATA disk card. Conditions: This symptom is observed when you enter the show file system EXEC command while a file is being written to the ATA disk card or when you enter the dir filesystem: EXEC command while a file is being written to the same device as the target of the dir filesystem: EXEC command.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: This symptom is observed when the traffic is switched from the input interface by using fast switching rather than Cisco Express Forwarding (CEF). Workaround: Configure CEF or distributed CEF (dCEF) on the input interface. • CSCea88987 Symptoms: A Cisco 10000 series does not support the 16-byte Path Trace Buffer (PTB) for Synchronous Digital Hierarchy (SDH) framing, which may cause difficulties for other platforms.
Resolved Caveats—Cisco IOS Release 12.0(27)S Workaround: Remove the ACL configuration from the interface that you delete before you add a new interface. • CSCeb21537 Symptoms: When multicast is enabled, a Fast Ethernet (FE) egress interface may fail to function. Although the mroute table appears to be correct, packets are not forwarded from the FE interface. Conditions: This symptom is observed on a Cisco 10000 series. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S Workaround: Enter the tag-switching ip interface configuration command followed by the no tag-switching ip interface configuration command on the newly-created GRE tunnel interface. • CSCeb37367 Symptoms: When the MPLS VPN Carrier Supporting Carrier feature is configured on a Cisco router, Label Distribution Protocol (LDP) may advertise a local label binding without installing an associated entry in the Multiprotocol Label Switching (MPLS) forwarding table.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCeb48648 Symptoms: A Cisco 7500 series Frame Relay VC may not come up when configured as a cross-connect over an MPLS core. Conditions: This symptom is observed on a Cisco 7500 series that functions as a provider edge (PE) router and that provides a Frame Relay connection via an Any Transport over Multiprotocol Label Switching (AToM) tunnel over a core interface that is configured to use RSP-based Weighted Fair Queueing (WFQ).
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCeb55043 Symptoms: A secondary Route Switch Processor (RSP) may reload when a service policy is detached from an ATM permanent virtual circuit (PVC). Conditions: This symptom is observed on a Cisco 7500 series that is configured with two RSPs in a redundant configuration. Workaround: First remove the PVC; then, recreate the PVC without the service policy attached to it.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCeb58316 Symptoms: Multiprotocol Label Switching (MPLS) traffic engineering (TE) interarea and interautonomous system tunnels may fail to reoptimize. Conditions: This symptom is observed when a better path becomes available at a node or link beyond the area or interautonomous system of the tunnel headend. Workaround: There is no workaround. • CSCeb59165 Symptoms: A standby card may not be able to switch to the active state.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: This symptom is observed under rare circumstances when a SONET bit error rate (BER) is reported. Workaround: There is no workaround. • CSCeb67098 Symptoms: A memory leak may occur in the Parallel Express Forwarding (PXF) interprocess communications (IPC) buffer on a Cisco 10720, as may be seen in the “toaster IPC buffer” counter in the output of the show buffers EXEC command.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: This symptom is observed on a Cisco 10720 that runs Cisco IOS Release 12.0(24)S or a later release when you send IPv4 traffic from a Fast Ethernet (FE) ingress interface to an FE egress interface. Workaround: There is no workaround. • CSCeb71938 Symptoms: In a redundancy configuration, a secondary Performance Routing Engine (PRE) may continue to reload at startup and not complete its bootup process.
Resolved Caveats—Cisco IOS Release 12.0(27)S When the symptom occurs, the output of the show hardware pxf cpu subblocks privileged EXEC command lists “noSB” for the affected subinterface, as is indicated in the following example: Router# show hard pxf cpu sub | i GigabitEthernet4 GigabitEthernet4/0/0 up 12000 4 PXF 1 81C4A800 4 GigabitEthernet4/0/0.500 administ 12000 4 PXF 1 81C4A800 noSB Workaround: Change the encapsulation of the subinterface to dot1q when the subinterface is not shut down.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCeb78610 Symptoms: The interface protocol may not come up for a 1-port OC-12 Packet-over-SONET (POS) line card when the encapsulation frame-relay interface configuration command is configured. Conditions: This symptom is observed on a Cisco 10000 series when the 1-port OC-12 POS line card is connected back-to-back to another line card in another Cisco 10000 series. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: This symptom may be observed in situations where three or more routers have advertised the same IP address in LDP address messages. This normally happens when routers have been misconfigured but in very rare circumstances may be done deliberately. The circumstance can be recognized by the presence of the following error message: %TAGCON-3-DUP_ADDR_RCVD: Duplicate Address 10.0.0.1 advertised by peer 10.2.2.2:0 is already bound to 10.1.1.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: These symptoms are observed on a Cisco 10000 series router that has a heavy load (10,000 PPP over Ethernet [PPPoE] PPP terminated aggregation [PTA] sessions with 6000 PPPoA sessions and 6000 active L2TP tunnels). Under these load conditions, when the 10,000 PTA sessions are cleared, the router stays at 100 percent CPU utilization for approximately 10 minutes. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCec03907 Symptoms: A Route Switch Processor 4 Plus (RSP4+) may reload. Conditions: This symptom is observed on a Cisco 7500 series when you configure the interface loopback interface-number interface configuration command on an interface of the router and the value of the interface-number argument is a 9-digit number that starts with 10.
Resolved Caveats—Cisco IOS Release 12.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCec15733 Symptoms: A Cisco router that is running IP over Multiprotocol Label Switching (MPLS) may reload when the Label Distribution Protocol (LDP) responds to the creation of a new session. Conditions: This symptom is observed when the router is operating under extremely stressful conditions that cause the CPU utilization to be close to 100 percent. This situation rarely occurs. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: These symptoms are observed only when the router reloads but the symptoms do not occur with every reload. Workaround: Perform the following steps: 1. Put the port into diagnostic serial loopback. 2. Remove the diagnostic serial loopback.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCec26076 Symptoms: When you enter the interface type 1/0.0 global configuration command to configure subinterface 0, the command does not configure the subinterface but the main interface; that is, the command is executed as if you had entered the interface type 1/0 global configuration command.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCec26773 Symptoms: A router may reload when there is an active intercept and a Performance Routing Engine (PRE) cutover occurs. Conditions: This symptom is observed on a Cisco 10000 series that is running the c10k-u2p10-mz image of Cisco IOS Release 12.0(25)S1. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCec31162 Symptoms: Incorrect tags may be imposed after a route has flapped. Conditions: This symptom is observed on a Cisco router that functions in a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) environment. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S Further Problem Description: When the protected interface goes down, FRR switches from the primary tunnel to the backup tunnel. • CSCec37930 Symptoms: The standby Route Switch Processor (RSP) for a Cisco 7500 series may reload unexpectedly. Conditions: This symptom is observed on an RSP for a Cisco 7500 series that has a LAN Extender (LEX) interface configured, and that has the Stateful Switchover (SSO) feature enabled. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: This symptom is observed on a Cisco 10720 Internet router that is running Cisco IOS Release 12.0(25) S or later releases, and only occurs when the L2TPv3 configuration uses hairpinning. Workaround: There is no workaround. • CSCec45704 Symptoms: ATM binding is not used by the Tag Forwarding Information Base (TFIB) Cisco Express Forwarding (CEF) table for some prefixes of remote provider edge (PE) routers on a PE router.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: This symptom is observed when node structures are created and recycled in the TE LSP topology database without proper reinitialization of the router ID. Workaround: There is no workaround. • CSCec59882 Symptoms: A Reverse Path Forwarding (RPF) check should be disabled for bootp packets with the source IP address 0.0.0.0 and the destination IP address 255.255.255.255.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCec63271 Symptoms: Some channelized PA-MC-2T3+ interfaces on a Cisco 7500 series router may go into a down/down state. When this symptom occurs, one or more groups of four T1 interfaces may go down simultaneously because of an Rx Alarm Indication Signal (AIS) alarm, and all of the interfaces associated with the down/down T1 interfaces may also go into the down/down state. Conditions: This symptom is observed only on a PA-MC-2T3+ port adapter.
Resolved Caveats—Cisco IOS Release 12.0(27)S – The remote PE router can ping the local CE router with ToS equal to 0xe0. – A ping with the route record option does not work in either direction. – A ping with the trace route option does work. Conditions: These symptoms are observed on the LSC of a Cisco MGX Route Processor Module (MGX-PRM-PR-512) that is running Cisco IOS Release 12.2(15) T4a.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCec68831 Symptoms: When a router boots up with an existing policy map, the quality of service (QoS) marking function may not function correctly depending upon the combination of line cards that are in the router. The symptom is observed more often with channelized port adapters. Conditions: This symptom has been observed on a Cisco 7500 series router with many channelized port adapter when the policy is applied to the input direction of the interface.
Resolved Caveats—Cisco IOS Release 12.0(27)S – Delete subinterface. – Create another subinterface. – Create the first subinterface again. Conditions: This symptom is observed on a Cisco 7500 series router that is running Cisco IOS Release 12.0 S or Release 12.2 S. Workaround: There is no workaround. Reload to clear the condition. • CSCec76078 Symptoms: A 4-port OC-3 ATM line card may reload within a few minutes.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCec87815 Symptoms: A buffer leak may occur in the Multilink PPP (MLP) header pool on a Versatile Interface Processor (VIP). The speed of the leak depends on the rate of traffic that is flowing between the interface of the VIP and the interface on the other end. The leak may eventually cause memory allocation failures (MALLOCFAIL) on the VIP and may result in memory fragmentation.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCed03356 Symptoms: The deletion of an ATM subinterface may occasionally cause a secondary Performance Routing Engine (PRE) to reload. Conditions: This symptom is observed on a Cisco 10000 series that has two PREs that are configured for high availability. Workaround: There is no workaround. However, the symptom does not affect performance. The primary PRE continues to forward traffic. The secondary PRE will reload if it is configured to do so.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCed46936 Symptoms: If the service-policy {output} command is configured on a PA-MC-8E1/120 interface, the ping of a neighbor router fails. Other IP traffic also stops. When this command is removed, the ping and other IP traffic starts passing through this line. Conditions: This symptom occurs when the service-policy {output} command is configured on a Cisco 7200 series router on a channelized interface, such as the PA-MC-8E1/120 interface.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCin49458 Symptoms: Pings between two customer edge (CE) routers may fail. Conditions: This symptom is observed after a high traffic load has occurred for a short period of time on Any Transport over Multiprotocol Label Switching (AToM) Layer 2 Tunneling Protocol version 3 (L2TPv3) virtual circuits (VCs). The VCs stay up, but pings may fail. Workaround: Reload the microcode onto the line card on which the VCs are configured.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCin51588 Symptoms: When you reload the microcode onto an enhanced 8-port multichannel T1/E1 port adapter (PA-MC-8TE1+) while traffic is flowing through the port adapter, the following error message may appear: %RSP-3-RESTART: interface Serial0/0/4:0, not transmitting In most cases, the interfaces of the port adapter recover on their own. In very rare cases, the execution of a Cbus Complex occurs. Conditions: This symptom is observed on a Cisco 7500 series.
Resolved Caveats—Cisco IOS Release 12.0(27)S • CSCin57433 Symptoms: All of the configured data-link connection identifiers (DLCIs) on a Multilink Frame Relay (MFR) interface are not active. Conditions: This symptom is observed if a Cisco router is booted with MFR in the startup configuration. Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS Release 12.0 S. Workaround: Enter the clear log EXEC command directly on the line card. • CSCuk47444 Symptoms: Memory allocated by the ip cef linecard ipc memory kbps global configuration command is not freed when a standby Route Processor (RP) becomes an active RP.
Resolved Caveats—Cisco IOS Release 12.0(27)S TCP/IP Host-Mode Services • CSCeb07106 Symptoms: The following error message appears in the log of a Cisco router: %TCP-6-TOOBIG: Tty0, too many bytes of options (44) Conditions: This symptom is observed when numerous TCP options are configured on the router. Workaround: Reduce the number of TCP options used (for example, selective-ack, timestamps, or BGP md5-password).
Resolved Caveats—Cisco IOS Release 12.0(27)S Conditions: This symptom is observed on a Cisco 7500 series that is configured for distributed switching. Workaround: Disable distributed switching. • CSCin53115 Symptoms: It may not be possible to add a bundle link to a Multilink Frame Relay (MFR) interface. Conditions: This symptom is observed on a Cisco router that has data-link connection identifier (DLCI) 896 configured. Workaround: Do not configure DLCI 896.
Resolved Caveats—Cisco IOS Release 12.0(27)S Cross-Platform Release Notes for Cisco IOS Release 12.0S 1416 OL-1617-14 Rev.
