BGP MESSAGE TYPES

BGP MESSAGE TYPES

• Open: After a neighbor is configured, BGP sends an open message to try to establish peering.  The message includes AS, Router ID, and hold time.

• Update: Message used to transfer routing information between peers.  Includes new routes, withdrawn routes, and path attributes.

• Keepalive: BGP peers echange keepalives every 60 seconds by default.  These are used to maintain the peering session active.

• Notification: When a problem occurs that causes a router to end BGP peering, a notification message is sent to the neighbor, and the connection is closed.

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