Mbgp Configuration; Mbgp Overview - 3Com S7906E Configuration Manual

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MBGP Configuration

The term "router" refers to a router or a Layer 3 switch in this document.
When configuring MBGP, go to these sections for information you are interested in:

MBGP Overview

Protocols and Standards
MBGP Configuration Task List
Configuring MBGP Basic Functions
Controlling Route Advertisement and Reception
Configuring MBGP Route Attributes
Tuning and Optimizing MBGP Networks
Configuring a Large Scale MBGP Network
Displaying and Maintaining MBGP
MBGP Configuration Example
MBGP Overview
BGP-4 is capable of carrying routing information for IPv4 only. IETF defined multiprotocol BGP
extensions to carry routing information for multiple network layer protocols.
For a network, the multicast topology may be different from the unicast topology. To meet the
requirement, the multiprotocol BGP extensions enable BGP to carry the unicast Network Layer
Reachability Information (NLRI) and multicast NLRI separately, and the multicast NLRI is used to
perform reverse path forwarding (RPF) exclusively. In this way, route selection for a destination through
the unicast routing table and through the multicast routing table will have different results, ensuring
normal unicast and multicast routing.
Multi-protocol BGP is defined in RFC 2858 (Multiprotocol Extensions for BGP-4).
Multi-protocol BGP for IP multicast is referred to as Multicast BGP (MBGP) for short.
This document covers configuration tasks related to multiprotocol BGP for IP multicast only. For
information about BGP, refer to BGP Configuration in the IP Routing Volume.
For information about RPF, refer to Multicast Routing and Forwarding in the IP Multicast Volume.
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