[mrtg] Can Mrtg cause a Router to crash because of the snmp querys?

Feijo, Fernando Fernando.Feijo at aaronrents.com
Thu Oct 9 15:58:17 CEST 2008


We have seen problems with SNMP queries, where the CPU on a Cisco 7206
would spike from 25 to 90%. It was, however, when we polled huge ip
accounting tables. With regular traffic-in-interface queries, it is hard
to believe it would impact the CPU noticeably.





From: mrtg-bounces at lists.oetiker.ch
[mailto:mrtg-bounces at lists.oetiker.ch] On Behalf Of Sean Cheesman
Sent: Thursday, October 09, 2008 9:47 AM
To: mrtg at lists.oetiker.ch
Subject: Re: [mrtg] Can Mrtg cause a Router to crash because of the snmp


If your network is so overloaded that a SNMP query per device every 5
minutes causes an implosion, I'd skip the MRTG and re-engineer your
network!  SNMP is very low priority and should in no way collapse your

On 10/9/08 9:31 AM, "Jack Bauguer" <jbauguer at yahoo.es> wrote:

Im trying to build a traffic analyzer based on Mrtg here for my company,
(10 big routers 80 switches 80 servers Cisco/Nortel).
There was an argument about creating this Mrtg-Server, some people claim
it would be suicidal, because many of the routers and switches operates
with heavy traffic and cpu load (about 75-85%) and querying these
elements every 5 minutes would collapse the network.
Can somebody give me some feedback on this, I personally dont believe
that querying through snmp every 5 minutes can cause such damage on the
network, even if they are on high capacity, i think maybe it could cause
a small delay on the query but nothing else, right?. I have allready
worked in a smaller enviourment and had no problems, but I need some
technical arguments to convince these guys, 
any ideas?
regards. JB


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