[rrd-users] Re: rrdtool - graphing the load of snmp itself

[Logg, Connie A.]

I use snmp quite heavily in monitoring our 13000 endpoint lan.  I measure the load by looking at the in/out octets on my monitoring systems. I read the octets, packets, errors, bcast, mcast and discards out of each endpoint port (switch or router) every 5 minutes. These activites seem to put little load on the network support devices. I also monitor the cpu utilization of the devices, and there is no noticable difference between a day with out snmp monitoring and a day with it.

Of course the "load" also depends on how much processing the device being accessed has to do to return the response.

"Higher" load inquiries are reading bridgetables and arp cache dumps, however there is no reason to do those "frequently". I do it twice a day to model the network.

Hope this helps....

              Connie Logg, Network Analyst, cal at slac.stanford.edu, 650-926-2879
       Stanford Linear Accelerator Center, MS 97, 2575 Sand Hill Road, Menlo Park, CA 94024
"'IF' is the middle word in life" but "Happiness is found along the way, not at the end of the road."



-----Original Message-----
From: dmahler at TELCORDIA.COM [mailto:dmahler at TELCORDIA.COM] 
Sent: Tuesday, June 17, 2003 1:12 PM
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] rrdtool - graphing the load of snmp itself


When one becomes successful with RRD and mrtg, there are times that the 
periodic question comes up: "how much snmp load is this putting on my 
network"? 
I get this with all my snmp pollers.  Especially a few weeks back when one 
of them went nuts and looped while doing discovery of the media2ip table. 
Ended up driving the IPSNMP process CPU on the cisco switch very high. So... I am looking to track the amount of SNMP traffic by my snmp pollers. 
  They are on a mix of windows and unix.  products like mrtg, concord, 
netview, spectrum, etc...

1) I was going to graph the mib2 snmp group - something like 
snmpInGetRequests.  But none of my snmp agents on these servers return any 
values for the snmp group of mib2.  sigh... 
2) I have been looking instead at the icmp group , like icmpInMsgs . these 
seem to have values.  but it is at all meaningful?   my busiest poller 
seems to be at around 4/second. 

not great solutions.  so, a question: 

When asked to track over time the snmp load of your pollers, what do you 
use?


much thanks for any help

Don Mahler 
SAIC /Telcordia 


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