Dell Configuration Guide for the S4048–ON System 9.14.2.5

• 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 Hosts

In future releases, environmental alarms and available free memory will be supported. You can configure client 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 both connected to the internet via interfaces running OSPF. Both routers belong to a VRRP group with a virtual router at 10.0.0.1 on the local area network (LAN) side. Neither Router A nor Router B is the owner of the group. Although Router A and Router B use the same default VRRP priority (100), Router B would normally 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 configure the default route as a tracked object, you can configure the VRRP group to track the state of the route. In this way, the VRRP priority of the router with the better metric automatically becomes master of the VRRP group. Later, if network conditions change and the cost of the default route in each router changes, the mastership of the VRRP group is automatically reassigned to the router with the better metric.