Explain Various States Of Bgp?

1.	Explain Various States Of Bgp?
Answer» Idle - The BGP process is either administratively down or waiting for the the next retry attempt. Connect - The BGP process is waiting for the TCP connection to be completed. If it is successful, it will continue to the OpenSent STATE. In case it fails, it will continue to the Active state. Active - BGP will try another TCP three-way handshake to establish a connection with the remote BGP neighbor. If it is successful, it will move to the OpenSent state. Opensent - The TCP connection EXISTS, and a BGP Open message has been SENT to the peer, but the matching Open message has not yet been received from the other router. Openconfirm - An Open message has been both sent to and received from the other router. Next step is to receive a BGP Keepalive message (to CONFIRM that all neighbor-related parameters match) or a BGP Notification message (to learn that there is some mismatch in neighbor parameters). Established - All neighbor parameters matched, the neighbor relationship has been established and the PEERS can now exchange Update messages

Answer»

Idle - The BGP process is either administratively down or waiting for the the next retry attempt.
Connect - The BGP process is waiting for the TCP connection to be completed. If it is successful, it will continue to the OpenSent STATE. In case it fails, it will continue to the Active state.
Active - BGP will try another TCP three-way handshake to establish a connection with the remote BGP neighbor. If it is successful, it will move to the OpenSent state.
Opensent - The TCP connection EXISTS, and a BGP Open message has been SENT to the peer, but the matching Open message has not yet been received from the other router.
Openconfirm - An Open message has been both sent to and received from the other router. Next step is to receive a BGP Keepalive message (to CONFIRM that all neighbor-related parameters match) or a BGP Notification message (to learn that there is some mismatch in neighbor parameters).
Established - All neighbor parameters matched, the neighbor relationship has been established and the PEERS can now exchange Update messages

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