TopicFortiGate →
Simple definition
A mechanism for overseeing a network link or gateway.
Technical definition
Link Monitor sends probes to one or more targets and can influence roads or link state depending on configuration.
What is it used for ?
Switch to a rescue path if the main path is no longer usable.
Practical example
A default route can be removed if the link monitor no longer joins its target.
Common issues
- Single target unavailable
- False changeover
- Confusion with Performance SLA SD-WAN
Related terms
Health Check SD-WAN · FortiGate
Key takeaway: Exact behavior and commands may vary depending on versions, products and architectures.