Configuring a large-scale IPv6 BGP network

In a large-scale IPv6 BGP network, configuration and maintenance become inconvenient because of too many peers. Configuring peer groups makes management easier and improves route distribution efficiency. Peer group includes IBGP peer group, where peers belong to the same AS, and EBGP peer group, where peers belong to different ASs. If peers in an EBGP group belong to the same external AS, the EBGP peer group is a pure EBGP peer group, and if not, a mixed EBGP peer group.

In a peer group, all members have a common policy. Using the COMMUNITY attribute can make a set of IPv6 BGP routers in multiple ASs have the same policy because community sending between IPv6 BGP peers is not limited by AS.

To assure connectivity between IBGP peers, make them fully meshed, but it becomes impractical when too many IBGP peers exist. Using route reflectors or confederation can solve this issue. In a large-scale AS, both of them can be used.

Confederation configuration of IPv6 BGP is identical to that of BGP4, so it is not mentioned here.