Re: BGP bfd and fast-external-failover
* BFD is to to detect a communication failure between the FortiGate and the BGP peer. It can be a link-failure, of a software issue for example. As soon as the BFD packets stop to be received, the BGP process is informed and can take action.
* fast-external-failover occurs when a physical link-failure is detected. In that case, it will shutdown the BGP peering and close the TCP connection .