
Configuring IP Exterior Gateway Protocols (BGP and EGP)
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Initiating a Peer-to-Peer Session
A BGP speaker initiates a peer-to-peer connection by periodically issuing an open
message.
BGP speakers respond to connection requests by returning open messages. In
Figure 6-1
, for example, BGP speaker A sends an open message to BGP speaker
B to request a connection; BGP speaker B responds by sending an open message
to BGP speaker A.
Figure 6-1. Establishing and Confirming a Connection Between BGP
Peers
All BGP speakers respond to connection requests from other speakers.
By default, BGP attempts to initiate a connection on each interface configured for
peer-to-peer communications. If the attempt is unsuccessful, BGP retries every
120 seconds.
You can use the BCC or Site Manager to specify a retry interval or disable the
initiation function by setting the retry parameter to 0.
BGP
Speaker B
BGP
Speaker A
Open message A to B
Open message B to A
BGP
Speaker B
BGP
Speaker A
Keepalive message A to B
Keepalive message B to A
IP0022A
BGP
speaker B
BGP
speaker B
BGP
speaker A
BGP
speaker A
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