Allied Telesis AT-S26 - Manual (Page 130)

Displaying Ethernet Statistics
130
Interpreting the Graphs
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 window 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.