Allied Telesis AT-S20 - Manual (Page 109)

AT-S20 User’s Guide
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1. Display any of the Ethernet statistics graphs by selecting
Ethernet statistics from the Main Menu.
2. Observe the counters and the graph.
The graph helps you visually monitor the proportion of good
and bad frames the switch has detected. Good frames consist
of filtered and forwarded unicasts, 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 occasionally. If the network seems to be slow, this
graph is one of the areas you can check to help isolate the
problem.
3. Identify and 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 statistics counters from any of the
Statistics screens after fixing the problem.
You need to reset counters to get a new baseline on frame
statistics. 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.
Note
For more details on resetting statistics counters, see Chapter 7,
Diagnostics.