Allied Telesis AT-S21 - Manual (Page 64)

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The statistics graphs show the types of received and transmitted
frames since the last time the counters or the switch were reset. The
counters and the graph dynamically increment as the switch
processes frames over a period of time.
When the individual counters reach a maximum of 2
32
(over 4
billion), they reset to zero. Because each counter resets
independently; your graph may become inaccurately skewed over
time; therefore, you need to reset the counters to get a new baseline
on frame statistics.
The graphs help you visually monitor the proportion of good and
bad frames the switch has detected. Good frames consist of filtered
and forwarded broadcasts and multicasts. Bad frames are runts and
long frames, or those with CRC or alignment errors. It is normal to
have a number of error packets now and then. If the network seems
to be “slow,” this graph is one of the areas you can check to help
isolate the problem.
To use the graphs as monitoring and diagnostics tools
1. Display any of the Ethernet statistics graphs by selecting
Ethernet statistics from the main menu.
2. Observe the counters and the graph.
3. Identify and then fix the problem.
Note that the problem may be external to the switch, and the
statistics may just indicate an error condition somewhere on
the network you need to fix. You may also need additional
monitoring devices specifically designed for that purpose,
such as a network analyzer, to identify the problem.
4. Select Zero all statistics counters on the entire
system from any of the Statistics screens after fixing the
problem.
You need to reset counters to get a new baseline. That is
because the counters and graphs still depict the information
during the error condition and will continue to increment
from there until you reset the counters.
Return to main menu.