Extreme Networks 200 Series - Manual (Page 182)

180 Summit 200 Series Switch Installation and User Guide
Status Monitoring and Statistics
• RMON probe —An intelligent, remotely controlled device or software agent that continually collects
statistics about a LAN segment or VLAN. The probe transfers the information to a management
workstation on request, or when a predefined threshold is crossed.
• 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 Features of the Switch
Of the nine groups of IETF Ethernet RMON statistics, the switch supports these four 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 can
be autocalibrated or set manually.
Alarms inform you of a network performance problem and can trigger automated action responses
through the Events group.
Events
The Events group creates entries in an event log and/or sends SNMP traps to the management
workstation. An event is triggered by an RMON alarm. The action taken can be configured to ignore it,
to log the event, to send an SNMP trap to the receivers listed in the trap receiver table, or to both log
and send a trap. The RMON traps are defined in RFC 1757 for rising and falling thresholds.