[mrtg] Re: Strange Behaviour

[Haspers]

I'm having more of the same problem with some device I'm logging (Cisco 7206
and Catalyst 2924). Sometimes with no reason a major spike is on the graphs
(and in the log). Even interfaces which are polled but are down (no link),
and therefore always return a zero, have a major spike in the graph up to 40
Mbps. I can't figure out why.

As I had to move the mrtg scripts to another machine I temporarely logged
the interface twice. The old machine used mrtg 2.9.4, the new 2.9.18pre1.
The spikes are only shown on the newest version, with 2.9.4 I've had no
problems ever.

I can't seem to figure out why, nothing has changed accept the MRTG version.
I'm going to do a test with an older version on the same devices on the same
machine and look if the machine is the problem.

Rolph


-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]On
Behalf Of Barry_Young at interliant.com
Sent: donderdag 28 februari 2002 13:28
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Strange Behaviour



I raised a point recently concerning strange data logging behaviour under
mrtg 2.9.17 which produces major spikes on the graphs.  Unfortunately I
experienced a re-occurence of this last night and therefore have the
opportunity to present some evidence for comment.....

An access-list controlling SNMP access was incorrectly modified yesterday
blocking MRTG from polling our Cisco devices, therefore all the counters in
the log file for this period were recorded as zero.  This situation
continued for approx. 18 hours.  However when this was recognised and the
access-list corrected, the log files for all our targets recorded major
traffic spikes.

Snip of logfile attached: -

1014887921 377696051 1096368766
1014887921 1071 1282 1071 1282
1014887623 1692271 4914737 3850078 11182043
1014887400 0 0 0 0
1014887100 0 0 0 0
1014886800 0 0 0 0
1014886500 0 0 0 0
1014886200 0 0 0 0

Is this the expected behaviour of MRTG?   Can it be avoided? Thanks in
advance for any help.
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