User guide

E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
18-13
RMON
• Management workstation — Communicates with the RMON probe and collects the
statistics from it. The workstation does not have to be on the same network as the
probe, and can manage the probe by in-band or out-of-band connections.
RMON F
EATURES OF THE
S
WITCH
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.
S
TATISTICS
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.
H
ISTORY
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.
A
LARMS
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.