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Dynamic Capability Negotiation

If both peers acknowledge support of dynamic capability negotiation, then at any subsequent point after the session is established, either peer can send a capabilities message to the other indicating a desire to negotiate another capability or to remove a previously negotiated capability.

The data field of the capability message contains a list of all the capabilities that can be dynamically negotiated. In earlier versions, now deprecated, the data field did not carry this information. Use the dynamic-capability-negotiation keyword to include the list. Use the deprecated-dynamic-capability-negotiation keyword to exclude sending the list.

Nondynamic capability negotiation is supported for the cooperative route filtering, four-octet AS numbers, deprecated dynamic capability negotiation, and dynamic capability negotiation capabilities. Dynamic capability negotiation of these capabilities is not supported.

If both sides of the connection advertise support for the new dynamic capability negotiation capability, then the peers negotiate which capabilities are dynamic and which are not.

If both sides of the connection advertise support only for the deprecated dynamic capability negotiation, then the BGP speaker uses dynamic capability negotiation for all capabilities that allow it without attempting to negotiate this with the peer.

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