HSRP msec timers

Unanswered Question
Sep 27th, 2007

Hi,

I have some serious issues using HSRP msec timers. I tried HSRP, HRSP v2 and GLBP ; all the same results

Actual : IOS 12.2(33)SXH

Old : IOS 12.2(18)SXF8

No physical problems, no errors on the interfaces, no STP problems (no redundant links) I tried to remove the port-channel, shutdown one of the two links and had the same symptoms...

The setup is simple, two 6506 + sup720 3B + 2GB port-channel between the two GB ports on each sup.

When I try to use anything less than 50 msec for hello and 150 msec for holddown I have a convergence the minute I do something ; anything like even "wr mem"

After debugging I see that the HSRP standby is not able to receive any hello from the HSRP active router each and every time the cpu is occupied (not 100% but 5% or more)

Thanks for any help, for now the timers are set at 250 msec for hello and 750 msec for holddown and everything seems ok.

Why with HSRP v2 the lowest value for hello is 15 msec when 50 msec is not even stable? I tried with 15 msec... disaster!

I have this problem too.
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nambi_gct Thu, 09/27/2007 - 22:36

Hi,

If you use HSRPv1 you need to set the millisecond timers in all routers.Hope you did that.

I found a tip from cisco.com.

Some HSRP state flapping can occasionally occur if the holdtime is set to less than 250 milliseconds,

and the processor is busy. It is recommended that holdtime values less than 250 milliseconds be used on

Cisco 7200 platforms or better, and on Fast-Ethernet or FDDI interfaces or better.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hiap_c/ch20/haiphsrp.pdf

Hope this helps you.

Regards,

Nambi

jesav Fri, 09/28/2007 - 04:35

Thanks Nambi,

Yes, of course the timers where set in both routers! I also tried 100 ms and 300 ms with the same kind of results. I don't know if it's another configuration related to multicast or if it's simlpy an hardware limitation...

Anyway, if I find something I will let you guys know!

Thanks,

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Posted September 27, 2007 at 6:16 PM
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