How to monitor packet traffic on Cisco switch?

I have a Cisco 3560G switch at the edge of my network. It has 2 connections out to our single ISP (redundant connections, 1G each, using iBGP, but all to a single source), and then 4 connections to different networks internally.

Overall things work well, but I've noticed the CPU on the switch spiking into the 30% range a bit, not sure if that means we are hitting the limits of the switch and should look at something more powerful.

I noticed that Cisco doesn't provide CPU specs of their switches, just how many packets/second they are rated for (mine is 38.7 Mpps)... I am attaching a graph of the CPU, which we are monitoring via SNMP using PRTG.

Any way I can know if this is packet related, and perhaps I need to upgrade to a higher-end switch?

Thanks.cisco cpu graph
LVL 2
tabushAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Ken BooneNetwork ConsultantCommented:
well since you are already using PRTG to monitor the CPU why don't you use PRTG to monitor the bandwidth utilization of each of the ports as well.  This way you will know if the CPU spike is happening at peak traffic times.  I wouldn't worry about CPU at 30% at all.  If you are pushing 90% you got a problem.  But I don't you have anything to worry about at 30%

Here is a link on how to troubleshoot a high cpu issue.  

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/troubleshooting/cpu_util.html

I really don't think 30% is anything to worry about from a 3560.  But if I were you and had the time I would want to find out why just so I knew what was going on on my network better ;)
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
tabushAuthor Commented:
thanks @ken. the CPU spikes don't correlate to traffic spikes. I will read up on the link you sent, and also good to note that 30% isn't something to worry about.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Switches / Hubs

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.