HSRP Standby track Command Purpose

[m_ashok89]

what is the use of "Standby (Group id) Track "command. we totally confused to know the exact reason y we are using this command in HSRP protocol

Please suggest the main reason 

[Charles Hill · Accepted solution]

Hello m_ashok89,

An example is using 2 routers with one acting as a failover router to access the internet.  

HSRP is configured on the inside interfaces of the routers.

The tracking is used to track the outside interfaces, which are non hsrp interfaces.

If the outside interface/line protocol goes down on the main router, the HSRP priority is decreased for that router, which results in the failover router having the higher priority and takes over as the active router.  

Even though the HSRP interfaces haven't failed, the network has avoided a network outage.

Hope this helps,
Please rate helpful posts.
Thanks.

[m_ashok89]

Thanku sir

[Charles Hill]

Your welcome.

Please rate helpful posts. :)

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

It allows you to "move" the active gateway when the tracked interface goes down.

It's most commonly used to track the backside interface.  What it does, it make routing a bit more efficient.  For example, the router with the active/how gateway loses it backside (e.g. WAN) interface.  So, as it no longer has a direct route out, it needs to direct traffic to a peer router, often one with a standby HSRP.  This works, but it causes traffic to take an extra hop.  More efficient would be have the standby gateway become the active gateway.  That's what the tracking option allows.  I.e. when active gateway's backside interface fails, it can "demote" its HSRP priority, allowing another HSRP router to become the active gateway.