
Configuring BGP Services
5-7
Figure 5-3. Establishing and Confirming a Connection between BGP
Peers
All BGP speakers respond to connection requests from other speakers. The
network administrator can specify whether BGP also issues connection requests
and, if so, how frequently.
Negotiating a Connection
BGP speakers use the exchange of Open messages to negotiate the characteristics
of the peer-to-peer connection.
For example, when BGP peers establish communications, they negotiate the
version of BGP that they use to exchange routing information. If you add both
BGP-3 and BGP-4 to an IP circuit, the router first attempts to use BGP-4. If the
BGP peer is not a BGP-4 speaker, the router uses BGP-3.
Site Manager allows you to configure a BGP speaker to issue connection requests and to
configure the request interval. For instructions, see the Connect Retry Timer parameter
on page 5-42.
For instructions on using Site Manager to control the way the router negotiates the BGP
version with a BGP peer, see the Min BGP Version parameter on page 5-41 and the Max
BGP Version parameter on page 5-41.
Open Message A to B
Open Message B to A
Keepalive Message A to B
Keepalive Message B toA
BGP
Speaker A
BGP
Speaker A
BGP
Speaker B
BGP
Speaker B
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