From: istong@stong.org
Date: Thu Mar 08 2007 - 16:28:48 ART
Joking aside you could actually consider disabling the
keepalive - but then replacing with a routing protocol over
the tunnel. The purpose of either is to alert you to
transport issues that affect the tunnel. Without either of
those mechanisms the tunnel will show as being up even if
not able to pass traffic. Other alternatives would be to
use a tool to ping or otherwise send traffic over the tunnel
to alert you to issues with the tunnel.
Thanks,
Ian
www.ccie4u.com
> I found the solution - forget about keepalives ;)
>
> Tunnels can be also divided into groups with different
> keepalives. Each group should then have, for example, 1
> second longer keepalive interval. Of course groups are
> imaginary, not configured. However this solution is very
> stilted, much better will be if Cisco allows to set this
> parameter manually.
>
> Regards
> Piotr Ojczyk
>
> ----- Original Message -----
> From: "Sergey Golovanov" <sergey.golovanov@iementor.com>
> To: "Piotr Ojczyk" <pojczyk@tlen.pl>;
> <ccielab@groupstudy.com> Sent: Thursday, March 08, 2007
> 12:24 AM 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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