
387
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Caveats
Resolved Caveats—Cisco IOS Release 12.0(33)S6
We recently switched over to Multilink PPP from Multilink Frame due to a requirement by our
MPLS provider. We did not have an issue using Multilink Frame; hence, we believe it is an issue
with our configuration for Multilink PPP.
Conditions: This issue was first noticed in a 32S6r image, and some nodes running 32s11 showed
similar symptoms.
Workaround: Perform a shut/no shut on the serial interface on the Cisco 12000 series side.
Further Problem Description: The root cause of this issue is that the customer was getting exposed
to an inherent limitation of a timer that was being used in the T1/E1 line-state processing routine at
the PLIM level. The malfunctioning of the timer would result in the PLIM not sending a line-state
update message to the linecard and the route processor when a link flapped, and therefore the route
processor would not bring the link down even when an alarm was present on the line. This would
cause blackholing of traffic for some time until the L2 times out and the protocol comes down.
• CSCsz11893
Symptoms: Some packet loss is observed when traffic is fragmented on a Cisco 12000 series
linecard. The issue has been reported using ping packets with a packet size larger than the egress
interface MTU size.
Conditions: This symptom is observed on:
–
Packets received by the Cisco 12000 series that would require fragmentation on the egress
linecard.
–
E5 linecards.
Workaround: Change the MTU size to prevent fragmentation from happening on the linecard.
• CSCsz12423
Symptoms: IP-to-MPLS packets that need to be fragmented might be dropped.
Conditions: This symptom is observed when an E4+ line card is used as ingress and an E4+, E5, or
E3 line card is used as egress.
Workaround: There is no workaround.
• CSCsz18371
Symptoms: A ping fails for bridging, and spurious access is seen upon reload.
Conditions: This symptom is observed when bridging is configured with HDLC encapsulation on a
Cisco 7200 router.
Workaround: There is no workaround.
• CSCsz19255
Symptoms: Tag rewrites are missing on linecards for one of the load-shareable interfaces.
Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(32)S11o.
Workaround: Shut/no-shut the interface.
• CSCsz28121
Symptoms: A router crashes when NetFlow export configurations are applied and removed.
Conditions: This symptom is observed only when NetFlow export version 9 configurations are
toggled.
Workaround: Use NetFlow export version 5 to export the flows.
Comentarios a estos manuales