
761
Caveats for Cisco IOS Release 12.2(33)SRD through 12.2(33)SRD8
OL-10394-05 Rev. R0
• CSCsm51942
Symptoms: Crash occurs usually during or after saving configuration with an exception CPU signal
10 at RP.
Conditions: This crash seems related with using SNMP and has been seen on Cisco IOS Release
12.2(33)SRC.
Workaround: There is no workaround.
• CSCsm53035
Symptoms: A few PBHK translations of sessions do not get deleted after idle- timeout in scale
scenario (number of session => 4000).
Conditions: This symptom is seen in scale scenario, when PBHK traffic is present on 4000 or more
sessions.
Workaround: In this case, chunk_malloc() is failing to allocate memory for a message going from
DP to CP. We replaced chunk_malloc() by managed_chunk_malloc (), which solves the issue.
• CSCsm53196
Symptoms: Crash occurs at "ip_route_delete_common".
Conditions: Occurs under the following scenario:
1)A multicast BGP route exists.
2)A unicast BGP route exists for the same prefix.
3)Another route covered by the same majornet as the BGP route exists.
4)There are both iBGP and eBGP sources for the BGP prefix.
5)Redistribution of BGP routes into an IGP must be configured.
Topology change in network causes mBGP to switch from using the iBGP sourced route to the eBGP
sourced route will cause the crash.
Workaround: If there are not both iBGP and eBGP sources for the same route the problem will not
occur. If redistribution of BGP Into an IGP is not configured the problem will not occur.
• CSCsm53392
Symptoms: Line card is power cycled because Forwarding Information Base (FIB) is disabled on
the line card. When this happens the following error message is generated:
%FIB-2-FIBDISABLE: Fatal error, slot 2/0 (2) %SNMP-5-MODULETRAP: Module 2 [Down] Trap
%OIR-SP-3-PWRCYCLE: Card in module 2, is being power-cycled off (FIB disabled on the
line card)
Conditions: FIB can be disabled on a given line card because of various reasons such as a software
error or due to platform transport error.
Workaround: When FIB disable occurs, the only way to recover from the issue is to perform an OIR.
After the changes made by this change request the line card will be automatically reloaded. If user
wants to disable the automatic reload of the line card enter the platform cef linecard fib-disable
action none command.
Further Problem Description: If user has configured the platform cef linecard fib-disable action
none command on the router and performs an ISSU upgrade or downgrade to an release where the
command is not supported, then MCL errors will be observed. This will cause the ISSU operation
to fail. User is advised to remove the above command while performing the ISSU operation.
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