Specifications

1385
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
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.
• CSCeb56480
Symptoms: A Label Distribution Protocol (LDP) session may not be established and may cause
network connectivity problems (a ping may fail). The local LDP identifier is set to 0.0.0.0:0 instead
of a valid identifier.
Conditions: This symptom is observed in Multiprotocol Label Switching (MPLS) configurations
when LDP is enabled.
Workaround: Enter the no mpls ip router configuration command followed by the mpls ip router
configuration command.
• CSCeb56909
Cisco Routers running Internetwork Operating System (IOS) that supports Multi Protocol Label
Switching (MPLS) are vulnerable to a Denial of Service (DoS) attack on MPLS disabled interfaces.
The vulnerability is only present in Cisco IOS release trains based on 12.1T, 12.2, 12.2T, 12.3 and
12.3T. Releases based on 12.1 mainline, 12.1E and all releases prior to 12.1 are not vulnerable.
More details can be found in the security advisory which is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20050126-les.shtml.
• CSCeb56976
Symptoms: Several Synchronous Digital Hierarchy (SDH) alarms and statistics do not function
correctly for SDH channelizations when 1-channel OC-12 or 4-channel STM-1 line cards are used
on a Cisco 10000 series router. These alarms and statistics are as follows:
– The NEWPTR counter that is displayed in the output of the show controllers sonet EXEC
command does not increment.
– The Alarm Indication Signal (AIS) is asserted rather than the Loss of Multiframe (LOMF) as
displayed in the output of the show controllers au-4-tug-3 EXEC command.
– The Binary Synchronous Communications (Bisync) IP (BIP)-2(TU-BIP) and Far End Block
Error (FEBE) counters are not incremented or stored in the output of the show controllers
au-4-tug-3 EXEC command.
– AIS is asserted under conditions in which Loss of Pointer (LOP) or Payload Label Mismatch
(PLM) should be asserted.
Conditions: These conditions are observed on a Cisco 10000 series that is running Cisco IOS
Release 12.0 S or Release 12.2 BX.
Workaround: There is no workaround.
• CSCeb57543
Symptoms: A virtual circuit (VC) that controls tag switching may pause indefinitely.
Conditions: This symptom is observed on a Cisco 7500 series when you repeatedly perform a
manual redundancy switchover.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the interface on which the affected VC is configured.