[nsp] IO-mem

[Mustafa N. Deeb]

hi,

ok, but this 3640 i'm talking about , we had a problem on it

default , cisco uses 15% OR 20% of memory to IO,

only in Peak hours, this router loses connectivity with the network, 
checking MRTG we see that traffic reaches  15Megs,
the logs says ,  Fast Ethernet  Protocol Down /UP , (interface Flaps)  ( 
later we added no keepalive)
we thought it was the switch, so we've put a new C2950 , but still the same


until i did  memory-size iomem 50

it worked, problem is  solved....


of course this contradicts with the memory calculator on Cisco web site .. 
but this worked for me

  am I missing something here ?

router is running 12.1.1T

Cheers




At 02:05 PM 4/28/2003 +0200, Gert Doering wrote:
>Hi,
>
>On Mon, Apr 28, 2003 at 01:46:34PM +0200, Mustafa N. Deeb wrote:
> > is there some kind of an equation of how much you need to dedicate IO
> > memory on a router (7200 , 3600)  depending on the traffic going through it
> >
> > for example 3640 is pumping 15Megs, on 64 megs of RAM , with 32M dedicated
> > to IO. is that enough ?
>
>As far as I understand, iomem isn't related to traffic, but to the
>specific kind of interfaces that you're using.
>
>I usually don't set up the iomem manually at all, but let IOS decide
>(works on 3640, with 12.2 and up, as far as I remember).  It will print a
>nice summary at boot time with the NMs configured and the amount of memory
>required for each.
>
> > how do you detect a shortage of IO-mem problem on a router?
>
>The router will complain about malloc failures in the log.
>
>gert
>--
>USENET is *not* the non-clickable part of WWW!
> 
>//www.muc.de/~gert/
>Gert Doering - Munich, Germany                             gert at greenie.muc.de
>fax: +49-89-35655025                        gert.doering at physik.tu-muenchen.de

-------------------------------------------------
Mustafa N. Deeb
Technical Director
Palnet Communications Ltd.
Tel: +970-2-2403434
Fax: +970-2-2403430
w w w . p a l n e t . c o m
w w w . p a l t i m e . n e t