[mrtg] Caching SNMP Responses

Alistair.McGlinchy at marks-and-spencer.com Alistair.McGlinchy at marks-and-spencer.com
Tue Dec 3 01:35:03 MET 2002

Hi All,

Is there any way to tell MRTG to Cache it's SNMP queries so that it only
polls a device once, even if the ip/port combo is mentioned multiple times
in a config file.

For example I would like to graph the CPU of two routers, and also have a
graph of the sum of the CPUs of both routers (so that I know what my
disaster-recoverable capacity is). 

My CFG file looks similar to the following example. 

Target[RouterA1]:. at x.y.
Target[RouterA2]:. at x.y.
@x.y.z.1 + 
. at x.y.z.2  

So the router is polled 4 times even though only two SNMP polls should be
required and the duplicate OID is requested twice in the same frame.Can
anyone suggest a way I can get MRTG to poll these devices more efficiently?
I'd ideally like to have a lot more targets like "RouterA1andA2" but without
having to consider the overhead of doubling my SNMP traffic. 

I could, perhaps, do the addition using a backtick target to read from the
first line of the .log files, but that seems awfully backward and

Any suggestions? 



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