For Contrail controller peers with gateway router with MP-BGP protocol, we oftentimes need to check both end; for the routes received from the peer, and routes advertised to the peer.

This article introduces how to check the route exchange information in a typical MP-BGP contrail setup.

You can get the per-neighbor route statistics from the command line. For example, with Juniper MX router, the following command can be used:

    labroot@test> show bgp neighbor 172.18.101.101 | find bgp.l3vpn.0
    ...<snipped>...
        Table bgp.l3vpn.0 Bit: 20001
          RIB State: BGP restart is complete
          RIB State: VPN restart is complete
          Send state: in sync
          Active prefixes:              116
          Received prefixes:            116
          Accepted prefixes:            116
          Suppressed due to damping:    0
          Advertised prefixes:          34

Here we see that MX is peering with a Contrail controller, and counter of received and advertised routes.  In contrast, Contrail currently does not have a good way to verify it. From the GUI or introspect, we can dump any specific routing table, but there is no known statistics about "Received prefixes" and "Advertised prefixes".