Symptom
If the PBB EVPN backbone source MAC is reconfigured then the previous value becomes a stale entry in the internal EVPN MAC DB
Conditions
Reconfigure the PBB EVPN backbone source MAC using "l2vpn pbb backbone-source-mac ".
The internal EVPN MAC DB will still contain the previous PBB backbone source mac value using "show evpn evi mac".
However, the BGP route-type 2 (mac-advertisement) database will be fine and will not contain the previous PBB backbone source mac value.
