Extreme Networks EPICenter Reference Manual page 267

RMON is disabled for some ports on the switch. If the switch as a whole can be reached and is
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reporting data, then individual ports that do not report data will be ignored. No error message
appears in this case.
If the EPICenter server is not successful in loading data from the device, it displays a message similar to
that shown in Figure 120.
Figure 120: Warning displayed when the EPICenter server cannot retrieve data
There are several reasons why the EPICenter server may not be able to display any device data:
The EPICenter server cannot communicate with the device (indicated by an "S" in a red circle next
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to the device name).
The device does not have RMON enabled, or RMON was just recently enabled and no data samples
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exist yet.
The device is marked offline.
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EPICenter Reference Guide
Displaying Multi-Port Statistics
267