Dell M6220 User Configuration Manual page 1067

Figure 37-6. Add Route Tracking
2 Select the virtual router ID and VLAN routing interface that will track the
route.
3 Specify the destination network address (track route prefix) for the route
to track. Use dotted decimal format, for example 192.168.10.0.
4 Specify the prefix length for the tracked route.
5 Specify a value for the Priority Decrement to define the amount that the
router priority will be decreased when a tracked route becomes
unreachable.
6. Click Apply to update the switch.
Configuring VRRP
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