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Cisco Bug: CSCvs62217 - Upon upgrading/reloading ASR920 traffic loss is observed at the Egress side.

Last Modified

Aug 29, 2020

Products (1)

  • Cisco ASR 920 Series Aggregation Services Router

Known Affected Releases


Description (partial)

Upon upgrading/reloading ASR920 traffic loss is observed at the Egress side.

This is an issue in egress TCAM programming for Qos. For the Qos to work, the Qos configurations will be programmed in the TCAM memory. Each policy-map will have its own TCAM memory and so when a packet matches a TCAM entry based on the match conditions (class-map), the TCAM will be hit and the packets will be subjected to the resultant actions from the TCAM (like set actions, policer, shaper etc) from the policy-map. In this case, packets entering the Poch64 was properly hitting the ingress policy-map and all the set-actions was also given to the packets, however in the egress pipeline for the egress policy-map to be matched, there was a mishit. Instead of hitting the TCAM entry for the egress policy-map in the egress interface gi0/0/0 & gi0/0/2, it was hitting a different TCAM entry.

This different TCAM entry in fact is a wrong entry programmed in the Hardware and it is a corrupted one. Therefore all the packet were dropping or trying to egress out of that interface from where the corrupted entry is programmed.
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