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BGP Overview


Border Gateway Protocol (BGP) is a path-vector protocol that is used to carry routing information between autonomous systems (ASs). To configure BGP, you must create and enable the BGP routing instance in a virtual router by assigning an autonomous system number to the BGP instance, and then enabling the instance. After you enable and configure the BGP peer, you can then enable BGP on the interface that is connected to the peer.

Before two BGP devices can communicate and exchange routes, they need to identify each other so they can start a BGP session. You need to specify the IP addresses of the BGP peers and, optionally, configure parameters for establishing and maintaining the session. Peers can be either internal (IBGP) or external (EBGP) peers. For an EBGP peer, you need to specify the autonomous system in which the peer resides.

All BGP sessions are authenticated by checking the BGP peer identifier and the AS number advertised by the peers. A successful connection with a peer is logged. If anything goes wrong with the peer connection, a BGP notification message is sent to or received from the peer, which causes the connection to fail or close.

For instructions for configuring BGP settings on the virtual router and on the interface, see the Network and Security Manager Online Help.