Re: [tkined] Can't get graphs to work for DVMRP parameter

Juergen Schoenwaelder (schoenw@ibr.cs.tu-bs.de)
Fri, 5 Feb 1999 12:15:09 +0100

>>>>> Alan J Flavell writes:

Alan> However, when I try to do the corresponding thing with the DVMRP
Alan> MIB, for example the virtual interface octets like
Alan> dvmrpVInterfaceInOctets, here's what happens. The browser shows
Alan> a plausible list of values, and shows them of being type
Alan> Counter32 as before. The "monitor" function sets up what looks
Alan> like a plausible monitoring job and draws their graphs, but the
Alan> numbers that are plotted are always exactly zero (displayed in
Alan> the caption as well as plotted, or should I say "not" plotted).

[snip]

Sounds pretty strange. Can you please verify that sysUpTime.0 ticks
correctly? There is only one case in the code where the value 0 is
returned - this happens if sysUpTime.0 did not increase between two
samples. (But I don't really expect that such a fundamental MIB object
is broken.)

Alan> Due to firewalling I am sorry but I cannot point you to an
Alan> actual router (mrouted) of mine that you can try this out for
Alan> yourself against, but I've tried it against other people's
Alan> SNMP-capable mrouteds that I was able to reach, and have
Alan> observed the exact same symptoms, so I know that it isn't
Alan> specific to the one mrouted that I am trying to monitor.

I expect that the problem is somewhere in the mrouted since the
monitoring code is pretty generic and I have not heard about such a
problem before. But its hard to say more without being able to play
with the agent.

If you want to debug this yourself, look at the procedures
ShowVariable and ShowVariableProc in apps/snmp_monitor.tcl. The
procedure ShowVariable called from the job scheduler and it just sends
out an SNMP get request. Once the response comes in, ShowVariableProc
is called. Printing out the received varbind list might help to figure
out what is going wrong here.
Juergen

-- 
Juergen Schoenwaelder  schoenw@ibr.cs.tu-bs.de http://www.cs.tu-bs.de/~schoenw
Technical University Braunschweig, Dept. Operating Systems & Computer Networks
Bueltenweg 74/75, 38106 Braunschweig, Germany.        (Tel. +49 531 / 391 3289)
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