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Option: Configuring MSDP Within a Layer 3 VPN


MSDP, defined in RFC 3618, allows a PIM-enabled network to connect multicast routing domains. It typically runs on the same router as a PIM sparse-mode rendezvous point (RP). Each MSDP router establishes adjacencies with internal and external MSDP peers similar to adjacency establishment for BGP peers. MSDP peer routers inform each other about active sources within the domain. When the peers detect active sources, they send explicit join messages to the active source.

You can configure MSDP in the master instance of a routing platform, or in the following types of routing instances:

  • Forwarding

  • No forwarding

  • Virtual router

  • VPLS

  • VRF

To configure MSDP in a Layer 3 VPN, include the msdp statement at the [edit routing-instances instance-name protocols] hierarchy level and specify local and peer addresses. You must also configure PIM sparse mode in the routing instance and specify a rendezvous point.

To view information about the operation of MSDP within a Layer 3 VPN instance, issue the show msdp instance, show msdp statistics instance, show msdp source instance, and show msdp source-active instance commands. For more information about MSDP, see the Junos Multicast Protocols Configuration Guide.