6.4.b Implement and troubleshoot tracking object

6.4.b [ii] Tracking different entities [e.g. interfaces, routes, IPSLA, and such]

An object track list allows you to track the combined states of multiple objects. Object track lists support the following capabilities:

● Boolean “and” function— Each object defined within the track list must be in an up state so that the track list object can become up.

● Boolean “or” function— At least one object defined within the track list must be in an up state so that the tracked object can become up.

● Threshold percentage— The percentage of up objects in the tracked list must be greater than the configured up threshold for the tracked list to be in the up state. If the percentage of down objects in the tracked list is above the configured track list down threshold, the tracked list is marked as down. ● Threshold weight —Assign a weight value to each object in the tracked list, and a weight threshold for the track list. If the combined weights of all up objects exceeds the track list weight up threshold, the track list is in an up state. If the combined weights of all the down objects exceeds the track list weight down threshold, the track list is in the down state.

track ip route command enables tracking of an IP prefix in the routing table. Entire set of attributes that can be tracked are as follows:

track object-number {interface interface-id {line-protocol | ip routing} | ip route ip-address/ prefix-length {metric threshold | reachability} | list{ boolean {and | or}} | {threshold {weight | percentage}}}

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 6137-6138).  . Kindle Edition.