From: Sean C (upp_and_upp@hotmail.com)
Date: Thu Mar 08 2007 - 10:36:26 ART
Hi Sergey,
Could you extrapolate on this a little: '...more than 200 gre tunnels
running with keepalives turned on will cause its CPU to go 100%.'
Were you able to baseline the CPU on the 37xx w/ tunnels and w/out using
keepalives? I just find that statistic is extraordinary.
Thanks.
Sean
----- Original Message -----
From: "Sergey Golovanov" <sergey.golovanov@iementor.com>
To: "Piotr Ojczyk" <pojczyk@tlen.pl>; <ccielab@groupstudy.com>
Sent: Wednesday, March 07, 2007 6:24 PM
Subject: Re: Tunnel keepalives
> I've been bugging TAC about this few times already. A 37xx router with
> more than 200 gre tunnels running with keepalives turned on will cause its
> CPU to go 100%. If you find a solution, let me know please :)
>
>
> --------------------------------------------------------------------
> Sergey Golovanov, CCIEx5 (R&S/Security/Voice/Service Provider/Storage)
> "Please, don't ask me for my ccie #, there are reasons why I can't release
> it"
> ieMentor Instructor and Content Developer
> sergey.golovanov@iementor.com
> http://www.iementor.com
>
>
>> -------Original Message-------
>> From: Piotr Ojczyk <pojczyk@tlen.pl>
>> Subject: Tunnel keepalives
>> Sent: Mar 07 '07 17:44
>>
>> Hello,
>>
>> When there are a few tunnels configured with the same time interval, the
>> keepalives are sent simultaneously for all the interfaces. It causes
>> quite
>> inconvenient situation when very big number of tunnels is used - a storm
>> of
>> keepalives is then generated followed by the long idle time. Especially
>> when
>> all the responding routers are connected to a multi-access network and
>> try
>> to reply immediately causing collisions.
>>
>> Is there any possibility to spread tunnel keepalives to be sent in
>> different
>> time?
>>
>> Thanks
>> Piotr
>>
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