Cisco Cisco IOS Software Release 12.4(4)T
1078
Caveats for Cisco IOS Release 12.4T
OL-8003-09 Rev. Z0
Resolved Caveats—Cisco IOS Release 12.4(9)T7
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CSCse92050
Symptoms: A router may reload unexpectedly when a routing event causes multicast boundary to be
configured on a Reverse Path Forwarding (RPF) interface.
configured on a Reverse Path Forwarding (RPF) interface.
Conditions: This symptom is observed on a Cisco platform that is configured for PIM.
Workaround: Remove multicast boundary from the configuration.
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CSCsi03359
Symptoms: A PIM hello message may not reach the neighbor.
Conditions: This symptom is observed on a Cisco router when an interface comes up and a PIM hello
message is triggered.
message is triggered.
Workaround: Decrease the hello timer for PIM hello messages.
Further Problem Description: The symptom occurs because the PIM hello message is sent before the
port can actually forward IP packets. IGP manages to get its neighborship up but PIM does not,
causing RPF to change to the new neighbor and causing blackholing to occur for up to 30 seconds.
port can actually forward IP packets. IGP manages to get its neighborship up but PIM does not,
causing RPF to change to the new neighbor and causing blackholing to occur for up to 30 seconds.
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CSCsi98730
Symptoms: The MPLS labels for packets that are forwarded via CEF and MPLS over a BGP route
may not match the labels in the BGP table, which may lead to traffic loss.
may not match the labels in the BGP table, which may lead to traffic loss.
Conditions: This problem occurs under certain circumstances and timing conditions.
Workaround: When the symptom occurs, enter the clear ip route command for the prefix in the
VRF.
VRF.
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CSCsj09838
Symptoms: When the BGP session between a Route Reflector (RR) and PE router flaps, the RR may
no longer send some routes to the PE router.
no longer send some routes to the PE router.
Conditions: This symptom is observed on a Cisco router that runs a Cisco IOS software image that
integrates the fix for caveat CSCsi85222. A list of the affected releases can be found at
integrates the fix for caveat CSCsi85222. A list of the affected releases can be found at
. 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 to prevent the symptom from occurring. When the symptom
has occurred, enter the clear ip bgp * all in command on the PE router to retrieve all routes from
the RR.
has occurred, enter the clear ip bgp * all in command on the PE router to retrieve all routes from
the RR.
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CSCsk45076
Symptoms: A traceback is seen at ipnat_dns_fix_resou.
Conditions: This symptom is observed when DNS traffic traverses the router and NAT is configured.
Workaround: There is no workaround.
Miscellaneous
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CSCek75633
Symptoms: A router may crash when you attach a VC class to an ATM bundle.
Conditions: This symptom is observed on a Cisco 7200 series but is platform-independent.
Workaround: There is no workaround.