31Object TrackingIPv4 or IPv6 object tracking is available on Dell Networking OS.Object tracking allows the Dell Networking OS client processes, such as virtual router redundancyprotocol (VRRP), to monitor tracked objects (for example, interface or link status) and take appropriateaction when the state of an object changes.NOTE: In Dell Networking OS release version 8.4.1.0, object tracking is supported only on VRRP.Object Tracking OverviewObject tracking allows you to define objects of interest, monitor their state, and report to a client when achange in an object’s state occurs.The following tracked objects are supported:• Link status of Layer 2 interfaces• Routing status of Layer 3 interfaces (IPv4 and IPv6)• Reachability of IP hosts• Reachability of IPv4 and IPv6 routes• Metric thresholds of IPv4 and IPv6 routes• Tracking of IP HostsIn future releases, environmental alarms and available free memory will be supported. You can configureclient applications, such as VRRP, to receive a notification when the state of a tracked object changes.The following example shows how object tracking is performed. Router A and Router B are bothconnected to the internet via interfaces running OSPF. Both routers belong to a VRRP group with a virtualrouter at 10.0.0.1 on the local area network (LAN) side. Neither Router A nor Router B is the owner of thegroup. Although Router A and Router B use the same default VRRP priority (100), Router B wouldnormally become the master for the VRRP group because it has a higher IP address.You can create a tracked object to monitor the metric of the default route 0.0.0.0/0. After you configurethe default route as a tracked object, you can configure the VRRP group to track the state of the route. Inthis way, the VRRP priority of the router with the better metric automatically becomes master of the VRRPgroup. Later, if network conditions change and the cost of the default route in each router changes, themastership of the VRRP group is automatically reassigned to the router with the better metric.602 Object Tracking
