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Administration Guide

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Link monitor with route updates

When a link monitor fails, only the routes that are specified in the link monitor are removed from the routing table, instead of all the routes with the same interface and gateway. If no routes are specified, then all of the routes are removed. Only IPv4 routes are supported.

Example

In this example, the FortiGate has several routes to 23.2.2.2/32 and 172.16.202.2/24, and is monitoring the link agg1 by pinging the server at 10.1.100.22. The link monitor uses the gateway 172.16.203.2.

When the link monitor fails, only the routes to the specified subnet using interface agg1 and gateway 172.16.203.2 are removed.

To configure the link monitor:
config system link-monitor
    edit "22"
        set srcintf "agg1"
        set server "10.1.100.22"
        set gateway-ip 172.16.203.2
        set route "23.2.2.2/32" "172.16.202.0/24"
    next
end
To check the results:
  1. When the link monitor is alive:

    # get router info routing-table static
    Routing table for VRF=0
    S*      0.0.0.0/0 [5/0] via 10.100.1.249, port12
    S       10.1.100.0/24 [10/0] via 172.16.203.2, agg1
    S       23.2.2.2/32 [10/0] via 172.16.203.2, agg1
    S       23.2.3.2/32 [10/0] via 172.16.203.2, agg1
    S       172.16.201.0/24 [10/0] via 172.16.200.4, port9
    S       172.16.202.0/24 [10/0] via 172.16.203.2, agg1
    S       172.16.204.0/24 [10/0] via 172.16.200.4, port9
                            [10/0] via 172.16.203.2, agg1
                            [10/0] via 172.16.206.2, vlan100, [100/0]
  2. When the link monitor is dead:

    # get router info routing-table static
    Routing table for VRF=0
    S*      0.0.0.0/0 [5/0] via 10.100.1.249, port12
    S       10.1.100.0/24 [10/0] via 172.16.203.2, agg1
    S       23.2.3.2/32 [10/0] via 172.16.203.2, agg1
    S       172.16.201.0/24 [10/0] via 172.16.200.4, port9
    S       172.16.204.0/24 [10/0] via 172.16.200.4, port9
                            [10/0] via 172.16.203.2, agg1
                            [10/0] via 172.16.206.2, vlan100, [100/0]

Link monitor with route updates

When a link monitor fails, only the routes that are specified in the link monitor are removed from the routing table, instead of all the routes with the same interface and gateway. If no routes are specified, then all of the routes are removed. Only IPv4 routes are supported.

Example

In this example, the FortiGate has several routes to 23.2.2.2/32 and 172.16.202.2/24, and is monitoring the link agg1 by pinging the server at 10.1.100.22. The link monitor uses the gateway 172.16.203.2.

When the link monitor fails, only the routes to the specified subnet using interface agg1 and gateway 172.16.203.2 are removed.

To configure the link monitor:
config system link-monitor
    edit "22"
        set srcintf "agg1"
        set server "10.1.100.22"
        set gateway-ip 172.16.203.2
        set route "23.2.2.2/32" "172.16.202.0/24"
    next
end
To check the results:
  1. When the link monitor is alive:

    # get router info routing-table static
    Routing table for VRF=0
    S*      0.0.0.0/0 [5/0] via 10.100.1.249, port12
    S       10.1.100.0/24 [10/0] via 172.16.203.2, agg1
    S       23.2.2.2/32 [10/0] via 172.16.203.2, agg1
    S       23.2.3.2/32 [10/0] via 172.16.203.2, agg1
    S       172.16.201.0/24 [10/0] via 172.16.200.4, port9
    S       172.16.202.0/24 [10/0] via 172.16.203.2, agg1
    S       172.16.204.0/24 [10/0] via 172.16.200.4, port9
                            [10/0] via 172.16.203.2, agg1
                            [10/0] via 172.16.206.2, vlan100, [100/0]
  2. When the link monitor is dead:

    # get router info routing-table static
    Routing table for VRF=0
    S*      0.0.0.0/0 [5/0] via 10.100.1.249, port12
    S       10.1.100.0/24 [10/0] via 172.16.203.2, agg1
    S       23.2.3.2/32 [10/0] via 172.16.203.2, agg1
    S       172.16.201.0/24 [10/0] via 172.16.200.4, port9
    S       172.16.204.0/24 [10/0] via 172.16.200.4, port9
                            [10/0] via 172.16.203.2, agg1
                            [10/0] via 172.16.206.2, vlan100, [100/0]