Filter
Top Products
120
C
HAPTER
8: S
TATUS
M
ONITORING
AND
S
TATISTICS
About the RMON
Groups
The IETF defines nine groups of Ethernet RMON statistics. The switch
supports the following four of these groups:
■
Statistics
■
History
■
Alarms
■
Events
This section describes these groups, and discusses how they can be used.
Statistics
The RMON Ethernet Statistics group provides traffic and error statistics
showing packets, bytes, broadcasts, multicasts, and errors on a LAN
segment or VLAN.
Information from the Statistics group is used to detect changes in traffic
and error patterns in critical areas of the network.
History
The History group provides historical views of network performance by
taking periodic samples of the counters supplied by the Statistics group.
The group features user-defined sample intervals and bucket counters for
complete customization of trend analysis.
The group is useful for analysis of traffic patterns and trends on a LAN
segment or VLAN, and to establish baseline information indicating
normal operating parameters.
Alarms
The Alarms group provides a versatile, general mechanism for setting
threshold and sampling intervals to generate events on any RMON
variable. Both rising and falling thresholds are supported, and thresholds
can be on the absolute value of a variable or its delta value. In addition,
alarm thresholds may be autocalibrated or set manually.
Alarms inform you of a network performance problem and can trigger
automated action responses through the Events group.