Extreme Networks ExtremeWare Enterprise Manager, Installation And User Manual

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TATISTICS
You can also view historical statistics for a single port. If you choose to view a single
port, the display shows the value of the selected variable(s) over time, based on the
number of datapoints the MIB maintains in the etherHistory table.
You can choose from a variety of styles of charts and graphs as well as a tabular
display.
You can view the following types of data:
• Percent Utilization for each port in the set (device, port group, or single port).
Percent utilization reports the value of the etherHistoryUtilization MIB object. The
MIB defines this variable as follows:
• Total Errors
for each port in the set (device, port group, or single port).
Total Errors is the sum of the six error variables shown in Table 10-2.
• Individual Errors for a single port.
An individual errors display shows the six variables shown in Table 10-2.
Table 10-1: Definition of RMON utilization variable used in port utilization displays
etherHistoryUtilization The best estimate of the mean physical layer
network utilization on this interface during this
sampling interval, in graphed in percents.
Table 10-2: Definition of RMON etherHistory error variables for port error displays
etherHistoryCRCAlignErrors The number of packets received during this
sampling interval that had a length between 64
and 1518 octets, inclusive, (excluding framing
bits but including Frame Check Sequence (FCS)
octets) but that had either a bad FCS with an
integral number of octets (FCS Error) or a bad
FCS with a non-integral number of octets
(Alignment Error).
etherHistoryUndersizePkts
The number of packets received during this
sampling interval that were less than 64 octets
long (excluding framing bits but including FCS
octets) and were otherwise well formed.