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BGP Detailed Messaging, Operation and Message Formats
The
previous section described the concepts
and general operation of the Border Gateway Protocol (BGP). To get a
better understanding of exactly how BGP works, it is helpful to take
a deeper look at its four different message types and how they are used.
As we do this, we can examine the fields in each message type, to help
us comprehend not just the way that messaging is accomplished, but the
way that routing data is actually communicated.
In this section I provide a comprehensive
description of the communication that takes place between BGP speakers
by providing details on BGP message types, how they are used, and the
data elements they contain. I begin with a description of common attributes
of BGP message generation and transport, and the general format used
for all BGP messages. I then provide a detailed description of each
of the four BGP message types: Open, Update, Keepalive
and Notification messages.
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Quick navigation to subsections and regular topics in this section
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