The vRouter provides the ability to track whether a logical interface is up, down, or not present, a VRRP group can only detect the status change of the interface on which the VRRP group is configured. VRRP cannot detect faults on the uplink interface or direct uplink of the master router, so services are interrupted if this uplink interface fails.
The Tracking interface functionality is used to mitigate this, by associating a VRRP group with an interface status. When the uplink interface or direct uplink of the master fails, the priority of the VRRP Master router is adjusted. This adjustment can be used to trigger a switchover to a VRRP backup router, ensuring traffic forwarding can continue.