[nsp] 3550 CPU OVERLOAD 80%

[Stephen J. Wilcox]

Those percentages arent all that high, were they the highest then? (I usually do 
sh proc cpu | e 0.00 do get a quick list of all proceses with interesting cpu)

The switches tend to overload when they're doing things other than forwarding 
traffic, in particular see if you can spot any unusual bursts of link local 
packets on any interface, very often you will find this is as a result of arp or 
spanning tree (watch the multicast/broadcast counters, they shouldnt be going up 
all that quickly normally)

Steve

On Fri, 26 Sep 2003, Jim Devane wrote:

> Hello All,
> 
> 
> I started mysteriously receiving these CPU Overload messages a few days
> ago. There is no pattern to them and they clear themselves ( the switch
> will fall back to 20% CPU or even 10%) but I am getting spikes of 85% or
> so.
> 
> I captured a sh proc cpu when an alarm came in and I was able to see
> what the CPU was doing but I don't uynderstand what some of these
> processes are. I am in need of a steer toward info or an outright
> explanation of these few things and if they are anything to worry about.
> In general I am not too worried since the switch does not stay at a high
> CPU cycle level, but I would like to learn about what is causing it to
> get so high.
> 
> The sh proc cpu offenders were:
>  SNMP Engine 4 - 7 % I have a good idea about this but not sure if 4-7
> is too high or not.
> 
> IP SNMP 3 - 5 % Not sure of the difference of SNMP Engine and IP SNMP
> 
> Pool Manager 2 - 3 % Not really sure about this one.
> 
> VUR_MGR bg proc 3 - 4 % No idea
> 
> And of course IP Input was about 9 - 11 % not sure if that seems high or
> not. I think the IP Input is probably OK.
> 
> Anyway, if there are any steers towards resources, CCO links, or
> ideas/suggestions/ explanations I would appreciate it.
> 
> 
> Thanks,
> Jim
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>