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BGP Peering Sessions

Unlike RIP and OSPF links, BGP peering sessions must be explicitly configured at both ends. To establish a session between BGP peers, you must manually specify the interface address to which you are establishing a connection. Once this configuration is complete on both ends of a link, a TCP negotiation takes place and a BGP session is established.

The type of the BGP peering session depends on whether the peer is outside or inside the host's autonomous system (AS):

Peering sessions established with hosts outside the local AS are external sessions. Traffic that passes along such links uses external BGP (EBGP) as its protocol.
Peering sessions established with hosts within the local AS are internal sessions. Traffic that passes along such links uses internal BGP (IBGP) as its protocol.

To monitor BGP neighbors, see the information about real-time performance monitoring (RPM) in the JUNOS Software Administration Guide.

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