RMON is a standard monitoring feature that allows various network agents and console systems to exchange network monitoring data. RMON provides you with comprehensive network-fault diagnosis, planning, and performance-tuning information. You can use the RMON feature with the Simple Network Management Protocol (SNMP) agent in the switch to monitor all the traffic flowing among switches on all connected LAN segments as shown in the figure below.
Figure 1. Remote Monitoring Example
Default RMON Configuration
RMON is disabled by default; no alarms or events are configured.
This example configures RMON alarm number 10. The alarm monitors the MIB variable ifEntry.20.1 once every 20 seconds until the alarm is disabled, and checks the change in the rise or fall of the variable. If the ifEntry.20.1 value shows a MIB counter increase of 15 or more, such as from 100000 to 100015, the alarm is triggered. The alarm in turn triggers event number 1, which is configured with the rmon event command. The possible events include a log entry or an SNMP trap. If the ifEntry.20.1 value changes by 0, the alarm is reset and can be triggered again.
Adds or removes an event in the RMON event table that is associated with an RMON event number.
This example creates RMON event number 1, which is defined as High ifOutErrors, and generates a log entry when the event is triggered by an alarm. The user user owns the row that is created in the event table by this command. This example also generates a Simple Network Management Protocol (SNMP) trap when the event is triggered.
Exits configuration mode.
Displaying RMON Status
To display the current RMON agent status on the device, use one or more of the privileged EXEC commands described in Table 1.
Table 1 Commands for Displaying RMON Status
show rmon alarms
Displays the RMON alarm table.
show rmon events
Displays the RMON event table.
This section gives a description, severity, and troubleshooting procedure
for each commonly encountered Cisco ME 2600X alarm and condition.