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MBGP Multicast VPN Extranets Configuration Guidelines

When configuring MVPN extranets, remember the following considerations:

  • If there is more than one VRF routing instance on a provider edge (PE) router that has receivers interested in receiving multicast traffic from the same source, virtual tunnel (VT) interfaces must be configured on all instances.
  • For auto-RP operation, the mapping agent must be configured on at least two PEs in the extranet network.
  • For asymmetrically configured extranets using auto-RP, when one VRF instance is the only instance that imports routes from all other extranet instances, the mapping agent must be configured in the VRF that can receive all RP discovery messages from all VRF instances and mapping-agent election should be disabled.
  • For bootstrap router (BSR) operation, the candidate and elected BSRs can be on PE, CE, or C routers. The PE router that connects the BSR to the MVPN extranets must have configured provider tunnels or other physical interfaces configured in the routing instance. The only case not supported is when the BSR is on a CE or C router connected to a PE routing instance that is part of an extranet but does not have configured provider tunnels and does not have any other interfaces besides the one connecting to the CE router.
  • RSVP-TE point-to-multipoint LSPs must be used for the provider tunnels.
  • PIM dense mode is not supported in the MVPN extranets VRF instances.

Published: 2010-04-15

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