OPEN Message

OPEN Message
The OPEN message is the first type of message sent after a TCP session has been formed. When the
OPEN message is accepted, a KEEPALIVE message confirming the OPEN message is returned.
After the KEEPALIVE is sent to confirm the OPEN message, incremental UPDATE messages,
NOTIFICATION messages, and KEEPALIVE messages will be exchanged between the BGP peers.
The OPEN message contains the fixed-size BGP header and the following fields, as depicted
in Figure 8.3.