Hi,
I had several goes at this on Saturday but my outgoing mail was failing.
I have found this sort of thing can happen when you get a nasty liitle routing loop
and of a "stuck in active". One way to find what is happening could be to do a "show
proc cpu" note what processes are happening, wait a minute or so and do it again note
what is happening, wait the same period of time and repeat the procedure. Then
compare each to see if you can identify what prcess is doing the damage. This is made
much easier if you baseline you cpu utilisation. That is, when things are going fie
do as above for a comarison of when it is failing.
If things are really bad you may need to do the above from the console. If so, check
what is going through the console and note any messages fly through there. This may
indeed be your problem. Once you know what is be sent to the console do a "no logging
console" and check the cpu. With any luck the errors going to the console will be in
the log. "show log".
It often takes some time to find but the methods above might help. The hardest is the
nasty little loop. (Which can be across Nations).
Hope this helps,
Teunis,
Hobart, Tasmania
Austalia
On Friday, January 19, 2001 at 06:52:58 AM, Deloso. Elmer G (WPNSTA Yorktown) wrote:
> Hello, gang.
> I'd like to know if anyone has seen this behaviour of a 4505 (v.11.2) where
> it is able to handle heavy traffic throughout the day with no more than a
> 50% cpu utilisation max but shows a few periods of spikes up to 98% when
> there is no WAN traffic say 4am or 9pm. These spikes show up as "outgoing"
> traffic which lasts ~15 to 20 mins on MRTG chart. Nothing shows up on the
> syslogs. I once tried sniffer before the router "crashed" and all i saw was
> a build up of ICMP and "other" packets. My guess is this is because the
> router is not responding to client requests thus it keeps getting a barage
> of "ICMP". This only shows up on the ethernet ports, i.e. coming in from e0,
> out e1 in reference to MRTG.
> Any ideas would help. Thanks.
>
> Elmer Deloso
>
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