Symptom

BGP RR not setting cluster-id at neighbor config/creation, thus routes from affected client are not reflected/advertised to other clients. From bgp debug : RP/0/RP0/CPU0:Aug 25 10:27:10.465 CDT: bgp[1084]: [default-upd] (ip4lu): No unreachable (cluster id not set for RR client:172.16.70.7) sent to sub-group 0.2 (Regular) with 172.17.64.191/32 - already withdrawn This is a timing condition and be verified from sh bgp neighbor for affected rr-client : BGP neighbor is 172.16.70.7 Remote AS 65108, local AS 65108, internal link Description: iBGP-Peer Remote router ID 172.16.70.7 <<<< MISSING : Cluster ID 172.31.189.7 BGP state = Established, up for 4d17h

Conditions

Prior to hitting this condition, a l2vpn evpn neighbor with RR client and advertise vpn4/vpnv6 config must have been removed : neighbor 10.0.0.1 remote-as X address-family l2vpn evpn route-reflector-client advertise vpnv4 unicast advertise vpnv6 unicast Failed commit due to incomplete config might also cause this.

Workaround

process restart bgp

Further Problem Description