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BGP Connection Process Guide

BGP has several states that define its connection and exchange of routing information with neighboring routers. It begins in an Idle state and attempts to connect by initiating a TCP session. If successful, it moves to the OpenSent state to send an Open message and waits for a response. Upon receiving an Open message, BGP establishes the connection and enters the Established state where routing updates are exchanged.

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vamsi krishna
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281 views1 page

BGP Connection Process Guide

BGP has several states that define its connection and exchange of routing information with neighboring routers. It begins in an Idle state and attempts to connect by initiating a TCP session. If successful, it moves to the OpenSent state to send an Open message and waits for a response. Upon receiving an Open message, BGP establishes the connection and enters the Established state where routing updates are exchanged.

Uploaded by

vamsi krishna
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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BGP States

BGP neighbor adjacency is


completed and BGP routers
6. BGP waits for open message will send update packets to
from the remote BGP exchange routing information.
neighbor.

7. If un-successful it comes back Established


1. This is the initial stage to Active State.
where BGP waits for Start

If successful
event. Open 6
Initiates a TCP session with
2 Sent 8
remote BGP neighbor.

If un-successful
If successful
If successful
Idle Connect Open
1 4 7 Confirm
2. It waits for TCP 3-way hand
shake to complete. 3 8. BGP waits for
3. If the connect retry timer Active keep alive messages
expires it again initiates TCP from remote BGP
session with remote peer. 4. BGP will try another TCP peer.
session to establish
connection with remote BGP If successful it move
neighbor. to establish state and
neighbor adjacency is
5. It returns back to connect completed.
5 state.
If un-successful

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