SNMP and CPU

Unanswered Question
Jan 7th, 2010

Anyone can tell me in general how much polling interfaces data with SNMP will affect the CPU?

For example, I have a 4507E and I'm polling in/out bits/s and errors every 5 minutes for 6 PO interfaces.  I don't see any impact at all on CPU.

Now there are 120 servers connecting to it.  Is it reasonable to think I could poll the switch for every interfaces? Would it make a difference or polling is polling no matter how many interfaces.

thank you

I have this problem too.
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Joe Clarke Thu, 01/07/2010 - 09:26

Polling is definitely not polling.  The more objects being polled, the more impact that will have on the CPU.  SNMP is a low priority process, so it should relinquish CPU if a higher priority process needs it, but if not, it will run as hot as it needs to.  If you are going to do a lot of polling, limit the number of request packets.  Use GETBULK requests to pull down large numbers of objects at once.

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