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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Multiprotocol BGP

MBGP is an extensison of BGP to carry routing information for multiple network-layer protocols such as IPv4 unicast and multicast, and IPv6 unicast. MBGP provides support for multiple network layer protocol address families that allows to define independent policy and peering configurations. MBGP carries different set of routes depending on the protocol. It carries routing information for IPv4 multicast and IPv6 unicast routes. Multiprotocol extensions for BGP (MBGP) is defined in IETF RFC 2858. MBGP allows different types of address families to be distributed in parallel.

MBGP allows information about the topology of the IP multicast-capable routers to be exchanged separately from the topology of normal IPv4 and IPv6 unicast routers. It allows a multicast routing topology different from the unicast routing topology.

MBGP uses either an IPv4 address configured on the interface (which is used to establish the IPv6 session) or a stable IPv4 address that is available in the box as the next-hop address. As a result, while advertising an IPv6 network, exchange of IPv4 routes does not lead to martian next-hop message logs.

NOTE It is possible to configure BGP peers that exchange both unicast and multicast network layer reachability information (NLRI), but you cannot connect multiprotocol BGP with BGP. Therefore, you cannot redistribute multiprotocol BGP routes into BGP.

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