[mrtg] Re: FW: MRTG not graphing

[Quibell, Marc]

Thanks for the info Rich, but these are Riverstone routers, and even if the
number do change in the routers, why doesnt't the MRTG change it too? WHere
does MRTG store these values? Filename? The IP of the interface remains the
same, and SNMPWALK works just fine, as does SNMPGET of the OID. But the
graphing just refuses to use the same number and I am forced to a different
version of SNMP (go from Version 2 to 1, and using the same circuit IP
address, this actually works!), or address the circuit differently, such as
going from IP address to interface number. The problem with going to SNMP v1
is that it won't graph above 100M. HELP!!

Marc 




-----Original Message-----
From: Rich Adamson [mailto:radamson at routers.com]
Sent: Monday, February 25, 2002 9:30 AM
To: Mrtg (E-mail)
Subject: [mrtg] Re: FW: MRTG not graphing



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.

Rich

> 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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