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Configuring MBGP (available only on the
S5500-EI)
This chapter covers configuration tasks related to multiprotocol BGP for IP multicast only. For more
information about BGP, see Layer 3—IP Routing Configuration Guide.
The term "router" in this chapter refers to both routers and Layer 3 switches.
MBGP overview
BGP-4 can carry routing information for IPv4 only. IETF defined Multiprotocol Border Gateway Protocol
(MP-BGP) to extend BGP-4 so that BGP can carry routing information for multiple network-layer protocols.
For a network, the topology for multicast might be different from that for unicast. To distinguish them, the
MP-BGP enables BGP to carry the unicast Network Layer Reachability Information (NLRI) and multicast
NLRI separately. The multicast NLRI performs reverse path forwarding (RPF) exclusively. In this way, route
selection for a destination through the unicast routing table and through the multicast routing table have
different results, ensuring consistent unicast forwarding and normal multicast between domains. For
more information about RPF, see "Configuring multicast routing and forwarding (available only on the
S5
500-EI)."
MP-BGP is defined in RFC 2858 (Multiprotocol Extensions for BGP-4). The application of MP-BGP on
multicast is called Multicast BGP (MBGP).
Protocols and standards
• RFC 2858, Multiprotocol Extensions for BGP-4
• RFC 3392, Capabilities Advertisement with BGP-4
• draft-ietf-idmr-bgp-mcast-attr-00, BGP Attributes for Multicast Tree Construction
• RFC 4271, A Border Gateway Protocol 4 (BGP-4)
• RFC 5291, Outbound Route Filtering Capability for BGP-4
• RFC 5292, Address-Prefix-Based Outbound Route Filter for BGP-4
MBGP configuration task list
Task Remarks
Configuring basic MBGP functions Required
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