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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Enabling MBGP Configurations

Multiprotocol BGP (MBGP) is an enhanced BGP that carries IP multicast routes. BGP carries two sets of routes: one set for unicast routing and one set for multicast routing. The routes associated with multicast routing are used by the protocol independent multicast (PIM) to build data distribution trees.

The Dell Networking OS MBGP is implemented per RFC 1858. You can enable the MBGP feature per router and/or per peer/peer-group.

The default is IPv4 Unicast routes.

When you configure a peer to support IPv4 multicast, the system takes the following actions:
  • Send a capability advertisement to the peer in the BGP Open message specifying IPv4 multicast as a supported AFI/SAFI (Subsequent Address Family Identifier).
  • If the corresponding capability is received in the peer’s Open message, BGP marks the peer as supporting the AFI/SAFI.
  • When exchanging updates with the peer, BGP sends and receives IPv4 multicast routes if the peer is marked as supporting that AFI/SAFI.
  • Exchange of IPv4 multicast route information occurs through the use of two new attributes called MP_REACH_NLRI and MP_UNREACH_NLRI, for feasible and withdrawn routes, respectively.
  • If the peer has not been activated in any AFI/SAFI, the peer remains in Idle state.

Most Dell Networking OS BGP IPv4 unicast commands are extended to support the IPv4 multicast RIB using extra options to the command. For a detailed description of the MBGP commands, refer to the Dell Networking OS Command Line Interface Reference Guide.

  • Enables support for the IPv4 multicast family on the BGP node. CONFIG-ROUTER-BGP mode address family ipv4 multicast
  • Enable IPv4 multicast support on a BGP neighbor/peer group. CONFIG-ROUTER-BGP-AF (Address Family) mode neighbor [ ip-address | peer-group-name] activate

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