Dell S4048-ON, Configuration Manual

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Object Tracking
IPv4 or IPv6 object tracking is available on Dell Networking OS.
Object tracking allows the Dell Networking OS client processes, such as virtual router redundancy protocol (VRRP), to monitor
tracked objects (for example, interface or link status) and take appropriate action 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 Overview
Object tracking allows you to define objects of interest, monitor their state, and report to a client when a change 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 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.
Object Tracking
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