Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 611

the default route in each router changes, the mastership of the VRRP group is automatically reassigned to the router with the better metric. Figure 96. Object Tracking Example When you configure a tracked object, such as an IPv4 or IPv6 a route or interface, you specify an object number to identify the object. Optionally, you can also specify: • UP and DOWN thresholds used to report changes in a route metric. • A time delay before changes in a tracked object's state are reported to a client. Track Layer 2 Interfaces You can create an object to track the line-protocol state of a Layer 2 interface. In this type of object tracking, the link-level operational status (UP or DOWN) of the interface is monitored. When the link-level status goes down, the tracked resource status is considered to be DOWN; if the link-level status goes up, the tracked resource status is considered to be UP. For logical interfaces, such as port-channels or virtual local area networks (VLANs), the link-protocol status is considered to be UP if any physical interface under the logical interface is UP. Track Layer 3 Interfaces You can create an object that tracks the Layer 3 state (IPv4 or IPv6 routing status) of an interface. • The Layer 3 status of an interface is UP only if the Layer 2 status of the interface is UP and the interface has a valid IP address. • The Layer 3 status of an interface goes DOWN when its Layer 2 status goes down or the IP address is removed from the routing table. Object Tracking 611