Fortigate link monitor (CLI only)

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Link-Monitor only works with the Static and Policy Route, not the Directly Connected Route.

Link health monitor enables FortiGate to detect dead links when the failure is beyond the local physical connection.



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.

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