Notification Message The last of the BGP message types, NOTIFICATION messages will be sent if errors are detected in the BGP session. When a NOTIFICATION message is sent, the BGP neighbor adjacency will be terminated, and the BGP connection will be closed. The TCP session and the BGP table will be cleared of all entries from the BGP neighbor.

NOTIFICATION Message A Notification message is sent when an error is detected with the BGP session, such as a hold timer expiring, neighbor capabilities change, or a BGP session reset is requested. This causes the BGP connection to close.

BGP Notification message If there is an error or problem with the BGP connection, the routers can send BGP Notification messages to inform the other router of the issue. This can cause the BGP connection to be terminated. BGP Notification messages contain information about the type of error that occurred and can be used to troubleshoot BGP issues.

The Notification message is sent whenever an error is detected and always causes the BGP connection to close. The section “BGP Message Formats” includes a list of possible errors that can cause a Notification message to be sent. An example of the use of a Notification message is the negotiation of a BGP version between neighbors.

Key Concept: BGP Notification messages are used for error reporting between BGP peers. Each message contains an Error Code field that indicates what type of problem occurred. For certain Error Codes, an Error Subcode field provides additional details about the specific nature of the problem.