H3C Technologies H3C S10500 Series Switches - Manual (Page 244)

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CAUTION:
•
It is not required to make clients of a route reflector fully meshed. The route reflector forwards routing
information between clients. If clients are fully meshed, disable route reflection between clients to reduce
routing costs.
• Generally, 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. To avoid routing loops, specify the same
cluster ID for these route reflectors by using the reflector cluster-id command.
Configuring a BGP confederation
Configuring 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, use the confederation nonstandard
command to make the local router compatible with these routers.
Configure a BGP confederation
After you split an AS into multiple sub ASs, you can configure a router in a sub AS as follows:
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 is
a single AS, which is identified by the confederation ID.
3. If the router must establish eBGP connections to other sub ASs, you must specify the peering sub
ASs in the confederation.
A confederation contains a maximum of 32 sub ASs. The AS number of a sub AS is effective only in the
confederation.
Follow these steps to configure a BGP confederation:
To do… Use the command… Remarks
Enter system view system-view —
Enter BGP view bgp as-number —
Configure a confederation ID confederation id as-number
Required
Not configured by
default.
Specify peering sub ASs in the confederation
confederation peer-as
as-number-list
Required
Not configured by
default.
Configure confederation compatibility
If some other routers in the confederation do not comply with RFC 3065, enable confederation
compatibility to allow the router to work with those routers.
Follow these steps to configure confederation compatibility:
To do… Use the command… Remarks
Enter system view system-view —