About Rmon; Rmon Alarms; Rmon Events - Cisco Nexus 7000 Series Configuration Manual

About RMON

About RMON
RMON is a Simple Network Management Protocol (SNMP) Internet Engineering Task Force (IETF) standard
monitoring specification that allows various network agents and console systems to exchange network
monitoring data. Cisco NX-OS supports RMON alarms, events, and logs to monitor Cisco NX-OS devices.
An RMON alarm monitors a specific management information base (MIB) object for a specified interval,
triggers an alarm at a specified threshold value (threshold), and resets the alarm at another threshold value.
You can use alarms with RMON events to generate a log entry or an SNMP notification when the RMON
alarm triggers.
RMON is enabled by default, but no alarms are configured in Cisco NX-OS. You can configure RMON alarms
by using the CLI or an SNMP-compatible network management station.

RMON Alarms

You can set an alarm on any MIB object that resolves into an SNMP INTEGER type. The specified object
must be an existing SNMP MIB object in standard dot notation (for example, 1.3.6.1.2.1.2.2.1.14 represents
ifInOctets.14).
When you create an alarm, you specify the following parameters:
• MIB object to monitor.
• Sampling interval—The interval that the device uses to collect a sample value of the MIB object.
• Sample type—Absolute samples take the current snapshot of the MIB object value. Delta samples take
• Rising threshold—The value at which the device triggers a rising alarm or resets a falling alarm.
• Falling threshold—The value at which the device triggers a falling alarm or resets a rising alarm.
• Events—The action that the device takes when an alarm (rising or falling) triggers.
Use the hcalarms option to set an alarm on a 64-bit integer MIB object.
Note
For example, you can set a delta type rising alarm on an error counter MIB object. If the error counter delta
exceeds this value, you can trigger an event that sends an SNMP notification and logs the rising alarm event.
This rising alarm will not occur again until the delta sample for the error counter drops below the falling
threshold.
Note The falling threshold must be less than the rising threshold.

RMON Events

You can associate a particular event to each RMON alarm. RMON supports the following event types:
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two consecutive samples and calculate the difference between them.
Configuring RMON