Fortigate link monitor (CLI only)

Link-Monitor will remove only the Static and Policy Route, not the Directly Connected Route.

FortiGate # config system link-monitor 
FortiGate (link-monitor) # edit 1
new entry 'port1-monitor' added

user get command to see current full status
FortiGate (port1-monitor) # set srcintf port1
FortiGate (port1-monitor) # set gateway-ip 10.200.1.254
FortiGate (port1-monitor) # set server 4.2.2.1
FortiGate (port1-monitor) # set protocol ping
FortiGate (port1-monitor) # set update-static-route enable 
FortiGate (port1-monitor) # end

FortiGate # config system link-monitor 
FortiGate (link-monitor) # edit 2
new entry 'port1-monitor' added
FortiGate (port1-monitor) # set srcintf port1
FortiGate (port1-monitor) # set gateway-ip 10.200.2.254
FortiGate (port1-monitor) # set server 4.2.2.2
FortiGate (port1-monitor) # set protocol ping
FortiGate (port1-monitor) # set update-static-route enable 
FortiGate (port1-monitor) # end

FortiGate # show system link-monitor 

config system link-monitor

    edit "1"

        set srcintf "port1"

        set server "4.2.2.1"

        set gateway-ip 10.200.1.254

    next

    edit "2"

        set srcintf "port2"

        set server "4.2.2.2"

        set gateway-ip 10.200.2.254

    next

end

FortiGate # diag sys link-monitor status
Link Monitor: 1, Status: alive, Server num(1), HA state: local(alive), shared(alive)
Flags=0x1 init, Create time: Mon Aug 21 16:43:45 2023
Source interface: port1 (3)
VRF: 0
Gateway: 10.200.1.254
Interval: 500 ms
Service-detect: disable
Diffservcode: 000000
Class-ID: 0
  Peer: 4.2.2.1(4.2.2.1) 
        Source IP(10.200.1.1)
        Route: 10.200.1.1->4.2.2.1/32, gwy(10.200.1.254)
        protocol: ping, state: alive
                Latency(Min/Max/Avg): 30.314/99.559/36.845 ms
                Jitter(Min/Max/Avg): 0.108/64.081/8.087
                Packet lost: 0.000%
                MOS: 4.377
                Number of out-of-sequence packets: 0
                Fail Times(0/5)
                Packet sent: 330, received: 329, Sequence(sent/rcvd/exp): 331/330/331
Link Monitor: 2, Status: alive, Server num(1), HA state: local(alive), shared(alive)
Flags=0x1 init, Create time: Mon Aug 21 16:20:16 2023
Source interface: port2 (6)
VRF: 0
Gateway: 10.200.2.254
Interval: 500 ms
Service-detect: disable
Diffservcode: 000000
Class-ID: 0
  Peer: 4.2.2.2(4.2.2.2) 
        Source IP(10.200.2.1)
        Route: 10.200.2.1->4.2.2.2/32, gwy(10.200.2.254)
        protocol: ping, state: alive
                Latency(Min/Max/Avg): 33.608/41.622/36.536 ms
                Jitter(Min/Max/Avg): 0.126/6.616/2.617
                Packet lost: 0.000%
                MOS: 4.383
                Number of out-of-sequence packets: 0
                Fail Times(0/5)
                Packet sent: 3142, received: 3129, Sequence(sent/rcvd/exp): 3143/3143/3144
Local-FortiGate # 

Link-monitor status on GUI

Add SDWAN widget to network dashboard

Log & Report > Events > System Events

verify routing change from cli or dashboard.