[mrtg] Strange Behaviour

[Barry_Young at interliant.com]

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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