Description | This article describes how to troubleshoots and verify the Bi-directional Forwarding Detection (BFD). |
Scope | FortiGate 7.0 or 7.2. |
Solution |
FortiGate 10.175.2.171 (Port7) <-> Switch 10.175.2.190. Run the CLI commands get router info bfd neighbor. It can seen the BFD is established with a neighbor switch.
OurAddress NeighAddress State Interface LDesc/RDesc
For more information on this, refer to Technical Tip : FortiGate BFD implementation and examples (Bidirectional Forwarding Detection for OS...
The Wireshark packet analyzer shows FortiGate 10.175.2.171 has sent out four BFD sessions (packet numbers 409,410,412 and 414) to neighbor switch 10.175.2.190. The neighbor switch did not send out BFD packet. Hence, FortiGate brought down the BFD in packet 414 based on the Detection Time.
Tip: The time of packet capture can be correlated with FortiGate router events.
For more information on this, refer to Technical Tip: How FortiGate calculates BFD timers (Transmit Interval, Detection Time). |
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