Configuring ipv6 mbgp, Ipv6 mbgp overview, Ipv6 mbgp configuration task list – H3C Technologies H3C S12500 Series Switches User Manual

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Configuring IPv6 MBGP

The term "router" in this chapter refers to both routers and Layer 3 switches.
This chapter covers only configuration tasks related to multiprotocol BGP for IPv6 multicast. For BGP and

IPv6 BGP related information, see Layer 3—IP Routing Configuration Guide.

IPv6 MBGP overview

BGP-4 can carry routing information for IPv4 only. IETF defined multiprotocol BGP extensions to carry

routing information for multiple network layer protocols.
On an IPv6 network, the IPv6 multicast topology must be different from the IPv6 unicast topology. To meet
the requirement, the multiprotocol BGP extensions enable IPv6 BGP to carry the IPv6 unicast Network

Layer Reachability Information (NLRI) and IPv6 multicast NLRI separately, and the multicast NLRI

performs reverse path forwarding (RPF) exclusively. In this way, route selection for a destination through

the IPv6 unicast routing table and through the IPv6 multicast routing table will have different results,
ensuring the normal unicast and multicast operation across ASs. For information about RPF, see

"Configuring multicast routing and forwarding."
Multiprotocol BGP is defined in RFC 2858 (Multiprotocol Extensions for BGP-4).
Multiprotocol BGP for IPv6 multicast is called "IPv6 MBGP."

IPv6 MBGP configuration task list

Task

Remarks

Configuring basic IPv6 MBGP
functions

Configuring an IPv6 MBGP peer

Required.

Configuring a preferred value for routes from a peer
or a peer group

Optional.

Controlling route distribution and
reception

Injecting a local IPv6 MBGP route

Optional.

Configuring IPv6 MBGP route redistribution