enable rmon

enable rmon


Enables the collection of RMON statistics on the switch.

Syntax Description

This command has no arguments or variables.


By default, RMON is disabled. However, even in the disabled state, the switch responds to RMON queries and sets for alarms and events. By enabling RMON, the switch begins the processes necessary for collecting switch statistics.

Usage Guidelines

The switch supports four out of nine groups of Ethernet RMON statistics. In an enabled state, the switch responds to the following four groups:
  • Statistics—The RMON Ethernet Statistics group provides traffic and error statistics showing packets, bytes, broadcasts, multicasts, and errors on a LAN segment or This command is available on the ExtremeSwitching X440-G2, X450-G2, X460-G2, X465, X590, X620, X670-G2, X690, X695, X870, 5320, 5420, 5520 series switches..

  • 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.

  • 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 auto calibrated or set manually.

  • 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.

The switch also supports the following parameters for configuring the RMON agent, as defined in RFC2021:
  • probeCapabilities—If you configure the probeCapabilities object, you can view the RMON MIB groups supported on at least one interface by the probe.

  • probeSoftwareRev—If you configure the probeSoftwareRev object, you can view the current software version of the monitored device.

  • probeHardwareRev—If you configure the probeHardwareRev object, you can view the current hardware version of the monitored device.

  • probeDateTime—If you configure the probeDateTime object, you can view the current date and time of the probe.

  • probeResetControl—If you configure the probeResetControl object, you can restart a managed device that is not running normally. Depending on your configuration, you can do one of the following:
    • Warm boot—A warm boot restarts the device using the current configuration saved in non-volatile memory.

    • Cold boot—A cold boot causes the device to reset the configuration parameters stored in non-volatile memory to the factory defaults and then restarts the device using the restored factory default configuration.



      You can only use the RMON features of the system if you have an RMON management application and have enabled RMON on the switch.

RMON requires one probe per LAN segment, and stand-alone RMON probes have traditionally been expensive. Therefore, the approach taken by Extreme Networks has been to build an inexpensive RMON probe into the agent of each system. This allows RMON to be widely deployed around the network without costing more than traditional network management. The switch accurately maintains RMON statistics at the maximum line rate of all of its ports.

For example, statistics can be related to individual ports. Also, because a probe must be able to see all traffic, a stand-alone probe must be attached to a nonsecure port. Implementing RMON in the switch means that all ports can have security features enabled.

To view the status of RMON polling on the switch, use the show management command. The show management command displays information about the switch including the enable/disable state for RMON polling.

To view the RMON memory usage statistics for a specific memory type (for example, statistics, events, logs, history, or alarms) or for all memory types, use the following command:

show rmon memory {detail | memoryType}


The following command enables the collection of RMON statistics on the switch:

enable rmon


This command was first available in ExtremeXOS 11.1.

Platform Availability

This command is available on ExtremeSwitching X435, X440-G2, X450-G2, X460-G2, X465, X590, X620, X670-G2, X690, X695, X870, 5320, 5420, and 5520 series switches.