[c-nsp] SNMP ENGINE consuming CPU

[Bill Blackford]

You hit on the issue. I had a NMS client polling the route table. This box has two full feeds and 12 other bilateral peers. Apparently, the cat7.6k/rsp720 doesn't do well in this scenario. I would imagine the GSR's or perhaps even the shiny new ASR's implement this in hardware, but I am speculating since I have no stick time on those platforms. I know this wouldn't be an issue on J, but that's a topic for another list.

Yes, my IOS version needs updating. I'm on 12.2(33)SRB1. Any recommendations?

Thank you for your feedback.

-b

-----Original Message-----
From: Paolo Lucente [mailto:pl+list at pmacct.net] 
Sent: Friday, July 24, 2009 2:13 AM
To: Bill Blackford
Cc: cisco-nsp mailing list
Subject: Re: [c-nsp] SNMP ENGINE consuming CPU

Hi Bill,

Often this is symptom that one or more NMS tools are freely walking
through the MIBs. Also, if you are running a recent 12.2SR train
image (not a recent SRD), you might be hitting the CSCsv80014 bug. 
Btw, which IOS version are you running?

A good (not specific to the 7600 platform) Cisco document about SNMP
causing high CPU load is at the following URL:

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a00800948e6.shtml

It simply suggests to put in place a view to cut down some pieces of
the available MIBs which can easily become rather big (ie. ARP table,
routing table). If any of the suggested solutions work, it could be
a good starting point to pin-point the issue. A more final solution,
viable only if you are somehow in control of the SNMP pollers that
regularly access your routers, is to double-check who is doing what
and why. The tricky corner case is indeed that your SNMP poller(s)
are intentionally making use of some large MIB for something.

Cheers,
Paolo


On Thu, Jul 23, 2009 at 02:04:33PM -0700, Bill Blackford wrote:

> Currently I have a 7606 RSP720 hitting 94% CPU. 
> A 'sh proc cpu sorted' indicates that SNMP ENGINE is the source.
> 
> Any thoughts on this?
> 
> Thanks
> 
> -b
> 
> --
> Bill Blackford                     
> Senior Network Engineer            
> Technology Systems Group           
> Northwest Regional ESD             
> 
> my /home away from home