Associating BGP sessions with MPLS L3VPNs

During the postprocessing phase of discovery, the
MPLS Topology Server
creates an “UnderlyingVPN” relationship
between
the discovered BGP services/ BGP protocol endpoints/ BGP sessions
and
the VPNs that are discovered during L3VPN discovery:
  • BGPService --> UnderlyingVPN --> VPN
  • BGPProtocolEndpoint --> Underlying --> VPN
  • BGPSession --> UnderlyingVPN --> VPN
  • The UnderlyingVPN relationship is what makes MPLS-BGP cross-domain correlation possible. It enables the
    MPLS Topology Server
    to generate VPN-impacted events for underlying BGP sessions that are impacted by BGP failures, misconfigurations, or manually disabled BGP protocol endpoints.