Cisco OL-4015-08 Manual de usuario Pagina 136

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Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Caveats
Resolved Caveats—Cisco IOS Release 12.0(32)S14
CSCsy92142
Symptoms: The serial interface on a channelized OC48 line card stays in the UP/DOWN state after
encountering Layer 1 alarms (PRID or PAIS). The interface continues to be in the UP/DOWN state
even after the Layer 1 alarms are cleared.
The interface is configured for PPP encapsulation, and path level delay triggers are enabled on this
interface. The link shows UP, but the PPP negotiation will be stuck in Echo Request Sent.
Conditions: This symptom is observed with a 12.0(32)S11o-based image for channelized DS3
Engine 3 line cards with alarm delay triggers configured. The problem will be seen only with
momentary path level alarms.
Workaround:
1. Perform a shut/no shut on the serial interface that is in the UP/DOWN state. However, this needs
manual intervention every time.
2. Remove the alarm-delay triggers path 2500 command from the serial interface configuration.
However, the side effect of this would cause the serial interface to flap.
CSCsy96287
Symptoms: A customer experienced a single T1 flapping on controller 0/3/0. It would take between
2,500 and 3,000 path code violations and then drop and come back. It would do this about once every
15 minutes. Problems with our phones losing connectivity to a central call manager when a WAN
circuit experiences a problem.
We use Multilink PPP to bundle three T1s for a 4.5-Mb circuit. If any one of the three T1s
experiences even a minor issue, phones are resetting. However, we never lose Layer 3 connectivity.
The edge router maintains its BGP peering across the Multilink PPP bundle, and none of our
management applications ever sees a loss in connectivity.
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 line card 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.
CSCsz19255
Symptoms: Tag rewrites are missing on line cards 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.
CSCsz55293
Symptoms: A remote third-party device is resetting the IPv6 BGP session with a Cisco 12000 router.
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