Peer Capability Update Notification in BGP Monitoring Protocol (BMP)

When BGP Dynamic Capability is supported, dynamic updates of capabilities are allowed over an established BGP session. At present, after the BGP session is established, the monitored router sends a BMP Peer Up Notification message first, containing the initial capabilities. If BGP Dynamic Capability is supported, using BMP Peer Up Notification messages to report subsequent capability changes for a BGP session becomes inappropriate. This document defines a new Peer Capability Update Notification message type in BMP to report peer capability changes.