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IPv6 MBGP configuration (available only on the
A5500 EI)
NOTE:
The term
router
in this document refers to both routers and Layer 3 switches.
This chapter only describes configuration for IPv6 MBGP. For more information about IPv6 BGP, see
the
Layer 3—IP Routing Configuration Guide
. For more information about BGP, see the
Layer 3—IP
Routing Configuration Guide
.
For more information about RPF, see the chapter “Multicast routing and forwarding configuration.”
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.
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
Complete the following tasks to configure IPv6 MBGP:
Task Remarks
Configuring IPv6 MBGP basic
functions
Configuring an IPv6 MBGP peer Required
Configuring a preferred value for routes from a
peer/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
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