Configuring Mbgp; Mbgp Overview; Protocols And Standards; Mbgp Configuration Task List - HP 6125G Configuration Manual

Configuring MBGP

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
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
Configuring basic MBGP functions
Controlling route
advertisement and
reception
"Configuring multicast routing and
Configuring MBGP route redistribution
Configuring default route redistribution into MBGP
Configuring MBGP route summarization
Advertising a default route to an IPv4 MBGP peer or peer group
Configuring outbound MBGP route filtering
Configuring inbound MBGP route filtering
Configuring MBGP route dampening
186
forwarding."
Remarks
Required
Required
Optional
Optional
Optional
Optional
Optional
Optional