Created on 04-11-2022 01:13 PM Edited on 11-26-2024 10:56 PM By Jean-Philippe_P
Description | This article describes BGP Neighbor Adjacency States. |
Scope | FortiGate. |
Solution |
BGP establishes a TCP connection with peers or adjacent routers. The Finite State Machine (FSM) is used by BGP to keep track of all BGP neighbors and the operational condition. The following states are possible for the BGP session to report:
If an error occurs the BGP process will transition to Idle state. From there the router will set a Connect timer, where it will not try to establish a BGP relationship with the declared offline member until the timer expires. Default Connect Timer FOS value 120.
Active: The BGP process will try to establish another TCP connection with the neighbor. Once the negotiated time out, still, if it fails then go back to connect or idle state based on the failure reason.
Open Sent: In this state, BGP is waiting for an Open message from the remote neighbor. When it is sending a keepalive it is set to hold on time, then moved to open confirm.
Open Confirm: In this state, BGP is waiting for a Keepalive message from the neighbor.
Established: In this state the connection is fully established and Update messages with routing information are exchanged. |
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