User guide

11-2 ExtremeWare EPICenter Software Installation and User Guide
Real-Time Statistics
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 foreachportintheset(device,portgroup,orsingleport).
Total Errors is the sum of the six error variables shown in Table 11-2.
• Individual Errors for a single port.
An individual errors display shows the six variables shown in Table 11-2.
Table 11-1: 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,
graphed in percents.
Table 11-2: 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.
etherHistoryOversizePkts The number of packets received during this sampling
interval that were longer than 1518 octets (excluding
framing bits but including FCS octets) but were
otherwise well formed.