I have read HSRP and have some knowledge of interface tracking but not able to understand the concept of tracking . Could you please explain about the scenario where this feature would be required and also what will be the effect if interface tracking not used.
In normal scenario everything looks working fine without tracking.
There are several ways to do tracking. Your original post seems to be asking about tracking interfaces in the operation of HSRP. This post asks about trackig in terms of static routing or dynamic routing. These are quite different aspects of tracking.
In the context of HSRP it can be very helpful to track the operational status of an interface. For example Interface FastEthernet0/0 may be an interface configured with HSRP and FastEthernet0/1 may be the outbound interface to other subnets. It is possible that the router may have lost connectivity through interface FastEthernet0/1 (it can not ping the next hop out that interface) but the interface will still show as up/up. Configuring tracking will give you the ability to recognize when connectivity is lost and to adjust the priority of FastEthernet0/0 in HSRP.
A different situation may involve static routing. You may have a static route configured with the next hop being out interface FastEthernet0/1. There could be a problem in the network and the next hop address may no longer be reachable. But the interface will show as up and the static route will remain in the routing table. If you configure tracking on the interface it may allow you to detect when the next hop is no longer reachable and to withdraw that static route from the routing table.
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