BGP Optimal Route Reflection (BGP-ORR)

You can configure BGP-ORR with IS-IS as the interior gateway protocol (IGP) on a route reflector to advertise the best path to the BGP-ORR client groups by using the shortest IGP metric from a client's perspective, instead of the route reflector's view. To enable BGP-ORR, include the optimal-route-reflection statement at the [edit protocols bgp group group-name] hierarchy level. Client groups sharing the same or similar IGP topology can be grouped as one BGP peer group. You can configure optimal-route-reflection to enable BGP-ORR in that BGP peer group. You can also configure one of the client nodes as the primary node (igp-primary) in a BGP peer group so that the IGP metric from that primary node is used to select the best path and advertise it to the clients in the same BGP peer group. Optionally, you can also select another client node as the backup node (igp-backup), which is used when the primary node (igp-primary) goes down or is unreachable.