Administrator Guide

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 dierent from the unicast routing topology.

MBGP uses either an IPv4 address congured 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 congure 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.

MBGP for IPv4 Multicast

PIM feature uses IPv4 multicast routing for data distribution. MBGP provides a link that is dedicated specic to multicast trac. MBGP

also allows a unicast routing apart from the multicast routing. A multicast routing protocol, such as PIM, uses both the unicast and

multicast BGP database to form a routing table for unicast and multicast. You can congure BGP peers that exchange both unicast and

multicast Network Layer Reachability Information (NLRI) in which MBGP routes is redistributed into BGP. The default is IPv4 unicast.

BGP Address Family model

Dell EMC Networking OS supports BGP address family identier (AFI) with MBGP to provide scalability for multiple AFI and subsequent

address family identier (SAFI) congurations. MBGP carries routing information for address families (IPv4 and IPv6) of multiple network-

layer protocols. Each address family has a separated BGP database, so that you can congure BGP policy based on address family.

IPv4 and IPv6 address family

The IPv4 address family conguration in Dell EMC Networking OS is used for identifying routing sessions for protocols that use IPv4

address. You can specify multicast within the IPv4 address family. The default of address family conguration is IPv4 unicast. You can

congure the VRF instances for IPv4 address family conguration.

The IPv6 address family conguration is used for identifying routing sessions for protocols that use IPv6 address. You can specify unicast

within the IPv6 address family. You can congure the VRF instances for IPv6 address family conguration.