Cisco Bug: CSCsy96287 - Linestate not propagated to LC, serial intf stays up after receiving AIS
Jan 28, 2017
- Cisco 12000 Series Routers
Known Affected Releases
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.
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