Technical Tip: Bidirectional Forwarding Detection (BFD)
| Description | The article describes BFD as a fast, low-overhead protocol that quickly detects link or path failures between adjacent devices and enables faster routing convergence in FortiOS v7.x and later. |
| Scope | FortiGate. |
| Solution | Bidirectional Forwarding Detection (BFD) is a lightweight and fast protocol used to detect link or path failures between two directly connected network devices. In FortiOS v7.x and later, BFD enables sub-second failure detection, independent of routing protocol timers.
BFD continuously exchanges small control packets between adjacent forwarding devices to verify connectivity at the forwarding plane level. This allows FortiGate to quickly detect failures related to interfaces, physical links, or forwarding engines and immediately notify routing protocols such as OSPF and BGP. By using BFD, FortiOS significantly reduces convergence time, ensuring faster failover, improved network stability, and minimal traffic disruption in high-availability and dynamic routing environments.
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