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Cisco Bug: CSCur16879 - VRF delete removes all NHIDs programmed for any interface

Last Modified

Jul 21, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

5.2.2.BASE

Description (partial)

Symptom:
Traffic drop due to NHID programming removed when VRF is deleted.

On ASR9k, drops can be observed with RSV_DROP_NHINDEX reason

Conditions:
Platform using NHIDs, that is NCS6k and ASR9k.

A VRF is unconfigured, or if SVD enabled the last interface in a given VRF is removed from a linecard, as this results in a VRF delete on the linecards.

Related Community Discussions

Next Hop index issue with vrf reconfiguration in 520 and 521 (fixed in 522)
Folks, we have come to learn about a serious issue described with <key>CSCur16879</key> Description: When FIB is informed on a node/card that a VRF has been deleted (e.g. congi delete), FIB ends up removing all the NHID entries used on the egress cards, and this regardless if the NHID entry is assocaited with the VRF being deleted or not. This results in persistent traffic loss, as the ingress cards will continue to have NHID entries in the path structures, and thus will continue to send packets with NHID values ...
Latest activity: Dec 03, 2014
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