Cisco Cisco IOS Software Release 12.2(27)SBC
683
Caveats for Cisco IOS Release 12.2(28)SB through 12.2(31)SB14
OL-9967-04 Rev. A1
Caveats
Workaround: Do not use SSHv2 when the router is very stressed.
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CSCsb63652
Symptoms: BGP convergence is very slow, and CPU utilization at the BGP Router process is always
near 100 percent during the convergence at the aggregation router. This issue obviously shows the
following tendencies:
near 100 percent during the convergence at the aggregation router. This issue obviously shows the
following tendencies:
1) The greater the number of component prefixes that belong to the aggregate- address entry,
significantly slower convergence is seen at the aggregation router.
significantly slower convergence is seen at the aggregation router.
2) The greater the number of duplicate aggregation component prefixes for the aggregate-address
entry, seriously slower convergence is seen at the aggregation router.
entry, seriously slower convergence is seen at the aggregation router.
Conditions: Any release would be affected if “aggregate-address” is configured and routing updates
are received every few seconds.
are received every few seconds.
Workaround: Remove the “aggregate-address.”
Further Problem Description: If you configure “aggregate-address” lines after BGP convergence has
been achieved, the BGP process only holds about 60 or 80 percent of the CPU for about 1 minute.
However, if you do peer reset after “aggregate-address” entries have been configured, the
convergence time is about 32 minutes (it is about 6 minutes if “aggregate-address” entries are
removed).
been achieved, the BGP process only holds about 60 or 80 percent of the CPU for about 1 minute.
However, if you do peer reset after “aggregate-address” entries have been configured, the
convergence time is about 32 minutes (it is about 6 minutes if “aggregate-address” entries are
removed).
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CSCsc47762
Symptoms: Removal of VRF via “no ip vrf...” in global configuration mode or “no ip vrf
forwarding...” in interface configuration mode.
forwarding...” in interface configuration mode.
Conditions: VRF and IP Multicast may be required for the symptom to occur.
Workaround: Make changes to the startup configuration of the router, and reload the router during
a service window.
a service window.
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CSCsf12539
Symptoms: Tracebacks may be generated for all accounting messages.
Conditions: This symptom is observed on a Cisco router that is configured for AAA.
Workaround: There is no workaround.
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CSCsg21394
Symptoms: A router reloads unexpectedly because of malformed DNS response packets.
Conditions: This symptom is observed when you configure name-server and domain lookup.
Workaround: Configure the no ip domain lookup command to stop the router from using DNS to
resolve hostnames.
resolve hostnames.
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CSCsg40885
Symptoms: A router crashes during an online insertion and removal (OIR) of a multilink interface.
Conditions: This symptom is observed on a Cisco 7200 series that is configured for MLP and PPP.
Workaround: Shut down the multilink interface before you perform an OIR.
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CSCsg78010
Symptoms: The show sss session detailed command displays traffic for the default traffic class (TC)
as “Unmatched Packets (dropped).”
as “Unmatched Packets (dropped).”
Conditions: This symptom is observed irrespective of the configuration; for example, whether the
default TC is set to forward or drop the traffic.
default TC is set to forward or drop the traffic.
Workaround: There is no workaround.