C H A P T E; Configuring Rmon; Information About Rmon; Rmon Alarms - Cisco Nexus 3548 series Configuration Manual

Configuring RMON

This chapter contains the following sections:
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Information About RMON

RMON is an Internet Engineering Task Force (IETF) standard monitoring specification that allows various
network agents and console systems to exchange network monitoring data. The Cisco NX-OS supports RMON
alarms, events, and logs to monitor Cisco Nexus device.
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 disabled by default and no events or alarms are configured in Cisco Nexus devices. You can configure
your RMON alarms and events 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, 1.3.6.1.2.1.2.2.1.17 represents
ifOutOctets.17).
When you create an alarm, you specify the following parameters:
• MIB object to monitor
• Sampling interval—The interval that the Cisco Nexus device uses to collect a sample value of the MIB
• Sample type—Absolute samples take the current snapshot of the MIB object value. Delta samples take
Information About RMON, on page 109
Configuration Guidelines and Limitations for RMON, on page 110
Configuring RMON, on page 110
Verifying the RMON Configuration, on page 112
Default RMON Settings, on page 112
object.
two consecutive samples and calculate the difference between them.
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