Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 249
MBGP Configuration, c e
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• If a set actions operation occurs in the first route map entry and then the same set action occurs with a different value in a subsequent route map entry, the last set of actions overrides the previous set of actions with the same set command. • If the set community additive and set as-path prepend commands are configured, the communities and AS numbers are prepended. MBGP Configuration e c MBGP for IPv6 unicast is supported on platforms t c e s MBGP for IPv4 Multicast is supported on platform t e MBGP is not supported on the E-Series ExaScale x platform. 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. FTOS MBGP is implemented as per RFC 1858. The MBGP feature can be enabled per router and/or per peer/peer-group. Default is IPv4 Unicast routes. Command Syntax address family ipv4 multicast neighbor [ip-address | peer-group-name] activate Command Mode CONFIG-ROUTER-BGP CONFIG-ROUTER-BGP-AF (Address Family) Purpose Enables support for the IPv4 Multicast family on the BGP node Enable IPv4 Multicast support on a BGP neighbor/peer group When a peer is configured to support IPv4 Multicast, FTOS takes the following actions: • Send a capacity 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 will mark 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information occurs through the use of two new attributes called MP_REACH_NLRI and MP_UNREACH_NLRI, for feasible and withdrawn routes, respectively.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 FTOS BGP IPv4 Unicast commands are extended to support the IPv4 Multicast RIB using extra options to the command. See the FTOS Command Line Interface Reference for a detailed description of the MBGP commands. Border Gateway Protocol IPv4 (BGPv4) | 249
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