[mrtg] Re: FW: MRTG not graphing

Rich Adamson radamson at routers.com
Mon Feb 25 16:29:41 MET 2002

Yes, but I don't know if it is an official Cisco bug, or a change in Cisco's
engineering methods. I tend to believe it's a design change associated with
snmp as several other strange snmp issues have popped up in the last 12 months.
If you follow Cisco's bug track, it appears they began an effort to rewrite
the snmp code a while back.

The problem is the snmp interface number can change from a number to another
under certain circumstances (including an IOS change, adding or removing a
card from the box, etc). I don't know exactly which IOS version these issues
first began to appear, but would suspect v12.0 code.

Other snmp issues that have appeared including the snmp statistics being reset
to zero when someone logs into the router and executes a "clear counters".
That will typically show up as a hugh unrealistic spike on mrtg charts.


> Has nobody encountered this before?
> -----Original Message-----
> There used to be a .ok file that held certain values. ANyone ever work with
> it?
> I have a problem where, if something changes in our routers such as an IOS
> change, MRTG will
> no longer graph the interface, giving an error, "Could not match
> host:'community at 207.28.xxx.xxx:::::2' ref:'Ip' key:'4.24.xxx.xxx'" Now I can
> snmpget and snmpwalk and come back with the same (correct) info in my
> config. Is there
> smewhere within MRTG that holds the old OIDs or some other number that I can
> reset or delete? TIA!

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