6-44z In general, it is not required to make clients of a route reflector fully meshed. The route reflectorforwards routing information between clients. If clients are fully meshed, you can disable routereflection between clients to reduce routing costs.z In general, a cluster has only one route reflector, and the router ID is used to identify the cluster.You can configure multiple route reflectors to improve network stability. In this case, you need tospecify the same cluster ID for these route reflectors using the reflector cluster-id command toavoid routing loops.Configuring a BGP ConfederationConfiguring a BGP confederation is another way for reducing iBGP connections in an AS.A confederation contains sub ASs. In each sub AS, iBGP peers are fully meshed. Between sub ASs,eBGP connections are established.If routers not compliant with RFC 3065 exist in the confederation, you can use the confederationnonstandard command to make the local router compatible with these routers.Configure a BGP confederationAfter you split an AS into multiple sub ASs, you can configure a router in a sub AS in the following way:1) Enable BGP and specify the AS number of the router.2) Specify the confederation ID. From an outsider’s perspective, the sub ASs of the confederation isa single AS, which is identified by the confederation ID.3) If the router needs to establish eBGP connections to other sub ASs, you need to specify thepeering sub ASs in the confederation.A confederation contains 32 sub ASs at most. The AS number of a sub AS is effective only in theconfederation.Follow these steps to configure a BGP confederation:To do… Use the command… RemarksEnter system view system-view —Enter BGP view bgp as-number —Configure a confederation ID confederation id as-numberRequiredNot configured bydefault.Specify peering sub ASs in the confederation confederation peer-asas-number-listRequiredNot configured bydefault.
