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.