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Configuring IPv6 MBGP
This chapter covers configuration tasks related to multiprotocol BGP for IPv6 multicast. For information
about BGP and IPv6 BGP, see Layer 3—IP Routing Configuration Guide.
The term "router" in this chapter refers to both routers and Layer 3 switches.
IPv6 MBGP overview
IETF defined Multiprotocol BGP (MP-BGP) to carry routing information for multiple network-layer
protocols.
For an IPv6 network, the topology for IPv6 multicast might be different from that for IPv6 unicast. To
distinguish them, the MP-BGP enables 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 have different results, ensuring consistent unicast
forwarding and normal multicast between domains. For information about RPF, see "Configuring
m
ulticast routing and forwarding."
MP-BGP is defined in RFC 2858 (Multiprotocol Extensions for BGP-4). The application of MP-BGP on IPv6
multicast is called IPv6 Multicast BGP (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 Optional
Configuring IPv6 MBGP route summarization Optional
Advertising a default route to a peer or peer group Optional
Configuring outbound IPv6 MBGP route filtering Optional
Configuring inbound IPv6 MBGP route filtering Optional
Configuring IPv6 MBGP route dampening Optional
Configuring IPv6
MBGP route
attributes
Configuring IPv6 MBGP route preferences
Optional
Configuring the default local preference
Configuring the MED attribute
Configuring the NEXT_HOP attribute Optional
Configuring the AS_PATH attribute Optional
Tuning and
Configuring IPv6 MBGP soft reset Optional
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