3com S7906E Manuel De Montage

 

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After route reflection is disabled between clients, routes can still be reflected between a client and a 

non-client. 

 

Confederation is another method to deal with growing iBGP connections in ASs. It splits an AS into 

multiple sub-ASs. In each sub-AS, iBGP peers are fully meshed, and intra-confederation eBGP 

connections are established between sub-ASs, as shown below: 

Figure 1-15 Confederation network diagram 

 

 

From the perspective of a non-confederation BGP speaker, it needs not know sub-ASs in the 

confederation. The ID of the confederation is the number of the AS. In the above figure, AS 200 is the 

confederation ID. 

The deficiency of confederation is: when changing an AS into a confederation, you need to reconfigure 

your routers, and the topology will be changed. 

In large-scale BGP networks, both route reflector and confederation can be used. 

 

For GR (Graceful Restart) information, refer to GR Configuration in the High Availability Volume. 

 

1)  To establish a BGP session with a peer, a BGP GR Restarter sends an Open message with GR 

capability to the peer.