In this video we will see how sessions are established between two endpoints running BGP. Analyze the implications of using TCP as the transport protocol and the BGP Finite State Machine.

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Video Description

A unique session is established for the exchange of information between the routers.

Uses the transport protocol/port: TCP/179

Since it's using TCP, BGP doesn't directly handle errors/seq numbers/ retransmits, etc. BGP only handles directly the exchange/processing of routing information. 

Just like with any TCP connection, there is a client and a server: 
The client starts the session from a random ephemeral port, with a destination port of 179.
In case of a collision (both devices start the connection at the same time), the connection started by the the router with the highest router-id remains up.



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