Diagnosing Switch Problems Remote Monitoring (RMON)
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 34-29
RMON probes can be enabled or disabled through CLI commands. Configuration of Alarm threshold
values for RMON traps is a function reserved for RMON-monitoring NMS stations.
This feature supports basic RMON 4 group implementation in compliance with RFC 2819, including the
Ethernet Statistics, History (Control & Statistics), Alarms and Events groups (described below).
Ethernet Statistics
Ethernet statistics probes are created whenever new ports are inserted and activated in the chassis. When a
port is removed from the chassis or deactivated, the Ethernet statistics group entry associated with the
physical port is invalidated and the probe is deleted.
The Ethernet statistics group includes port utilization and error statistics measured by the RMON probe
for each monitored Ethernet interface on the switch. Examples of these statistics include CRC (Cyclic
Redundancy Check)/alignment, undersized/oversized packets, fragments, broadcast/multicast/unicast, and
bandwidth utilization statistics.
History (Control & Statistics)
The History (Control & Statistics) group controls and stores periodic statistical samplings of data from
various types of networks. Examples include Utilization, Error Count, and Frame Count statistics.
Alarm
The Alarm group collects periodic statistical samples from variables in the probe and compares them to
previously configured thresholds. If a sample crosses a previously configured threshold value, an Event is
generated. Examples include Absolute or Relative Values, Rising or Falling Thresholds on the Utilization
Frame Count and CRC Errors.
Event
The Event group controls generation and notification of events from the switch to NMS stations. For
example, customized reports based on the type of Alarm can be generated, printed and/or logged.
Note. RMON 10 group and RMON2 are not implemented in the current release. An external RMON probe
that includes RMON 10 group and RMON2 be used where full RMON probe functionality is required.
Note. The following RMON groups are not implemented: Host, HostTopN, Matrix, Filter, and Packet
Capture.
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