BMP Extension for Monitoring Multiple BGP Instances

The BGP Monitoring Protocol (BMP), as defined in RFC 7854, provides a means for monitoring BGP sessions. In deployments where a single device runs multiple BGP instances simultaneously - typically a base instance together with one or more additional instances, each identified by an Instance Name and potentially running in a separate process with an independent Router-ID and Autonomous System (AS) number - the existing BMP message format does not allow a Monitoring Station to distinguish peers or routes belonging to different BGP instances on the same monitored router. This document defines a new BMP Type-Length-Value (TLV) element, the BGP Instance Name TLV, that carries the Instance Name of the BGP instance associated with a given peer or route. Following the TLV extension framework defined in [I-D.ietf-grow-bmp-tlv], the new TLV MAY appear in Peer Up Notification, Peer Down Notification, Route Monitoring, Statistics Report, and Route Mirroring messages. The TLV enables a Monitoring Station to unambiguously attribute monitored BGP information to the correct BGP instance on the monitored router.