Specifications

1336
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
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. The problem occurs when a VRF is configured on a subinterface that faces
the L2 switch.
Workaround: Remove the VRF from the subinterface that faces the L2 switch.
• 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.
Conditions: This symptom is observed under either one of the following two conditions:
- An SNMP HSRP query triggers a loop in the getnexts. Some MIB browsers catch this, and exit
with a message stating “OID not increasing.”
- A scaling problem may occur with HSRP when there are a high number of tracked interfaces. For
every standby track statement, every interface is tested to see if it is an HSRP tracked interface. No
defined thresholds have been identified and tested that qualify when this scaling problem may occur.
The more interfaces there are configured, the greater is the possibility that the problem occurs.
Workaround: Do not initiate an SNMP query for HSRP.
Alternate Workaround: Enter the snmp-server global configuration command to specify which
MIBs are available, as in the following example:
snmp-server view HSRP internet included
snmp-server view HSRP ciscoHsrpMIB excluded
snmp-server view HSRP ciscoHsrpExtMIB excluded
snmp-server community public view HSRP RW 20
snmp-server community private view HSRP RW 20
• CSCed52578
Symptoms: The MPLS packets are forwarded with a bogus label when they are sent out on a
loadshared non-VRF MPLS enabled “Internet” interface from a VRF.
Conditions: A static route for the VRF should be configured to reach the Internet, which would in
turn be configured to recourse over 2 static routes to reach the next hop for the global Internet.
Workaround: Shut down one of the interfaces to remove the load-sharing condition.
• CSCed54080
Symptoms: Per VPN per destination load balancing is not operating correctly on an Engine 2 or 4+
that is running Cisco IOS Release 12.0(23)S4 and seems to be load sharing only on BGP nexthop.
Conditions: There are no specific conditions.
Workaround: The clear ip route vrf vrf- name command invokes a recalculation on the hashes.
Also, the clear ip bgp neighbor soft command (can) reassign(s) new labels and respread(s) the load.
These commands may impact service by stopping traffic forwarding.