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Cisco Bug: CSCvu94775 - EVPN auto RD changes after RP switch over causing traffic blackhole

Last Modified

Oct 22, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)

BGP EVPN Local Routes are transmitted with improper Auto RD after failover, this causes quite a churn in the EVPN routes resulting in withdrawal and re-advertisement causing traffic blackhole for a duration.

In issue state:
"show evpn summary" will show the "EVPN Router ID" the old BGP router ID which was reconfigured

- EVPN evi is configured with no manual RD, that is has auto RD configured
- BGP Router ID is modified (say A -> B)
- Switchover [This causes EVPN routes to again move to A:nn instead of the current B:nn pre failover]
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