B.10. BGP-4 Message Types and Parameters (Chapter 8)Table B-23 explains the possible BGP message types in BGP message Header.
At the moment, two optional parameters are specified in an OPEN message, as explained in Table B-24. The optional parameter BGP Capability is very important for IPv6 support.
Table B-25 lists and explains some of the most common attributes. Detailed explanations should be taken directly from RFC 1771 or any RFC extending BGP (e.g., BGP Route Reflection defines attribute types 9 and 10).
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