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4506 CPU utilization average

I have a 4506 (IOS cat4500-IPBASEK9-M, Version 12.2(25)SG2), Supervisor II+ and 04x 48 port 10/100 with PoE modules, that is at one of ours distribution wiring closets. The CPU utilization average is 43% measured on last 3 months. How we are startin the pilot and preparing for soon installing IP Telephony solutions (4000 Ip stations), I would like to check if this is normal, because today at this switch there is no active PoE device and my concern is about the moment we start activating them. Somebody could hel me please?

6 REPLIES
New Member

Re: 4506 CPU utilization average

Hi,

I don't know about Sup2, but for a Sup4 it is on the high side. I would say that "normal" cpu utilization is 15-25% for a 4500. We often experience severe problems when we are over 60%....

Re: 4506 CPU utilization average

This is my concern because we are setting infrastructure ready to support IP Telephony. Some time peaks reach 54% of utilizatin

Rds,

Alex

New Member

Re: 4506 CPU utilization average

Do you know what cousing the cpu load?

"K2CpuMan Review" does not say much. Even if it's not showing, ospf, spanning-tree etc. can give high figures on that parameter.

But if it's plane traffic it seems like a very high value for the 4500 platform...

Re: 4506 CPU utilization average

At ou diagram we have OSPF only at two 6506 core switches where Vlan are been routed. At distribution switches like this one there is no routing. I'm affraid of two things, excessive traffic load or some mistaken or missing spanning tree configuration that is causing that. I hope how VoIP traffic will be set to high priorization queue, this doesn's increase too much the CPU load.

Re: 4506 CPU utilization average

Hello,

you might want to read through "High CPU Utilization on Cisco IOS Software-Based Catalyst 4500 Switches"

http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml

Allowing you to understand different reasons for High CPU load and how to troubleshoot them.

As such the average CPU seems to be more or less ok, as it depends on the features and hardware in use.

Regards, Martin

Re: 4506 CPU utilization average

Hi Martin,

It was a very helpfull document but what do you suggest for me to identify directly my profile of traffic?

Rds,

Alex

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