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Beginner

HSRP

What is difference between hold timer, active timer and standby timer? They're all purposes same

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VIP Advisor

Re: HSRP

Hello

If preempt is enabled then no it shouldn't has if/when a peer comes up which has a preferred higher priority then it will take the active role irrelevant of how long the initial active peer has been up



kind regards
Paul

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It will hopefully assist others with similar issues in the future
6 REPLIES 6
VIP Advisor

Re: HSRP

Hi there,

This document explains their purpose:

 

https://www.cisco.com/c/en/us/support/docs/ip/hot-standby-router-protocol-hsrp/10583-62.html#topic14

 

cheers,

Seb.

VIP Advisor

Re: HSRP

Hello

standby xx timers x( hello 5)  x (hold timer)

 

Hello timer - is the time value that the router will send a hello to its neighbor to see if its active
Hold timer  -  is the time value the rtr will wait if no response to that hello is received

Active/Standby rtr timer is based on both the hello and hold timers, meaning if the rtr it doesn't receive a hello its active/standby timer will be the hold time value however it should not get down to that as it should refresh every received hello.

 

example:

standby x timers 5 15

Active-Standby/Hold timer = 15 seconds
Hello is 5 seconds = So every 5 seconds a hello will be send so the active/standby timer should not go below 10 seconds until its refreshed however if it doesn't receive a response from a hello it will count down from 15 seconds to 0 before stating the active peers is not reachable.

 



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future
Beginner

Re: HSRP

Does the uptime of the router matters while electing the active router?

VIP Advisor

Re: HSRP

Hello

If preempt is enabled then no it shouldn't has if/when a peer comes up which has a preferred higher priority then it will take the active role irrelevant of how long the initial active peer has been up



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future
Beginner

Re: HSRP

How many standby routers an HSRP standby group can have? 

VIP Advisor

Re: HSRP

Hello

Hum not so sure  tbh the priority value ranges from 0 255 so it could be quite extensive however the probability of multiple rtrs failing in you hrsp environment at the same time is I would say very low so you wouldn’t require that many I guess.



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future
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