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Cisco Bug: CSCvv31871 - EVPN: When we unconfigure and configure NVE in particular order. FLood traffic drop is seen.

Last Modified

Aug 30, 2020

Products (1)

  • Cisco Catalyst 9500H Series Switches

Known Affected Releases

16.12.1 16.9.5 17.3.1 17.4.1

Description (partial)

L2CP VNI is down when all up condition including "host-reachability protocol bgp" is met. NVE conplains L2CP VNI is down dueto bgp host-reachability is un-configured.

Below L2VNI configure sequence under the NVE interface will trigger the issue:
1, Configure the L2VNI first by command "member vni [id]  mcast-group [bum group]", 
2, Configure bgp host-reachability and source-interface for the nve interface.
3, Run "show nve vni [id] detail", the VNI is down and the reason said "BGP host-reachability un-configured"
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