478 CHAPTER 36: IPV6 BGP CONFIGURATIONn If the peer keep-all-routes command is used, all routes from the peer/peergroup will be saved regardless of whether the filtering policy is available. Theseroutes will be used to generate IPv6 BGP routes after soft-reset is performed.Configuring theMaximum Number ofLoad-Balanced RoutesFollow these steps to configure the maximum number of load balanced routes:Configuring a LargeScale IPv6 BGPNetworkIn a large-scale IPv6 BGP network, configuration and maintenance become noconvenient due to too many peers. In this case, configuring peer groups makesmanagement easier and improves route distribution efficiency. Peer group includesIBGP 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 sameexternal AS, the EBGP peer group is a pure EBGP peer group, and if not, a mixedEBGP peer group.In a peer group, all members enjoy a common policy. Using the communityattribute can make a set of IPv6 BGP routers in multiple ASs enjoy the same policy,because sending of community between IPv6 BGP peers is not limited by AS.To guarantee connectivity between IBGP peers, you need to make them fullymeshed, but it becomes unpractical when there are too many IBGP peers. Usingroute reflectors or confederation can solve it. In a large-scale AS, both of them canbe used.Confederation configuration of IPv6 BGP is identical to that of BGP4, so it is notmentioned here. The following describes:■ Configuring IPv6 BGP peer group■ Configuring IPv6 BGP community■ Configuring IPv6 BGP route reflectorPrerequisites Before configuring IPv6 BGP peer group, you have:■ Made peer nodes accessible at network layer■ Enabled BGP and configured router ID.Configuring IPv6 BGPPeer GroupCreate an IBGP peer groupFollow these steps to create an IBGP group:To do… Use the command… RemarksEnter system view system-view -Enter BGP view bgp as-number RequiredEnter IPv6 address family view ipv6-family -Configure the maximumnumber of load balancedroutesbalance number RequiredBy default, no load balancingis enabled.To do… Use the command… RemarksEnter system view system-view -
