- Index
- Preface
- Product Overview
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- Configuring Ethernet Interfaces
- Configuring VLANs
- Configuring Private VLANs
- Configuring Rapid PVST+
- Configuring Multiple Spanning Tree
- Configuring STP Extensions
- Configuring Port Channels
- Configuring Access and Trunk Interfaces
- Configuring the MAC Address Table
- Configuring IGMP Snooping
- Configuring Traffic Storm Control
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- Configuring Fibre Channel Interfaces
- Configuring Domain Parameters
- Configuring N-Port Virtualization
- Configuring VSAN Trunking
- Configuring SAN PortChannels
- Configuring and Managing VSANs
- Configuring and Managing Zones
- Distributing Device Alias Services
- Configuring Fibre Channel Routing Services and Protocols
- Managing FLOGI, Name Server, FDMI, and RSCN Databases
- Discovering SCSI Targets
- Advanced Features and Concepts
- Configuring FC-SP and DHCHAP
- Configuring Port Security
- Configuring Fabric Binding
- Configuring Fabric Configuration Servers
- Configuring Port Tracking
Configuring RMON
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 5000 Series switches
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 5000 Series. You can configure your RMON alarms and events by using the CLI or an SNMP-compatible network management station
This section contains the following topics:
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 Cisco Nexus 5000 Series switch uses to collect a sample value of the MIB object.
- The sample type—Absolute samples take the current snapshot of the MIB object value. Delta samples take two consecutive samples and calculate the difference between them.
- Rising threshold—The value at which the Cisco Nexus 5000 Series switch triggers a rising alarm or resets a falling alarm.
- Falling threshold—The value at which the Cisco Nexus 5000 Series switch triggers a falling alarm or resets a rising alarm.
- Events—The action that the Cisco Nexus 5000 Series switch takes when an alarm (rising or falling) triggers.
Note
Use the hcalarms option to set an alarm on a 64-bit integer MIB object.
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:
- SNMP notification—Sends an SNMP risingAlarm or fallingAlarm notification when the associated alarm triggers.
- Log—Adds an entry in the RMON log table when the associated alarm triggers.
- Both—Sends an SNMP notification and adds an entry in the RMON log table when the associated alarm triggers.
You can specify a different even for a falling alarm and a rising alarm.
Configuration Guidelines and Limitations
RMON has the following configuration guidelines and limitations:
Configuring RMON
This section includes the following topics:
Note If you are familiar with the Cisco IOS CLI, be aware that the Cisco NX-OS commands for this feature might differ from the Cisco IOS commands that you would use.
Configuring RMON Alarms
You can configure RMON alarms on any integer-based SNMP MIB object. The following two types of SNMP alarms can be configured:
To configure the 32-bit RMON alarm, use the rmon alarm command. To configure the 64-bit high-capacity RMON alarm, use the rmon hcalarm command.
You can optionally specify the following parameters:
- The event-number for 32-bit and 64-bit RMON alarms. The event number triggers the alarm if the rising or falling threshold exceeds the specified limit. Use the rising-event or falling-event parameters to specify the event-number value. The range is from 0 to 65535. If no value is specified, event 0 is the default.
- The rising and falling threshold value for 32-bit RMON alarms. Use the rising-threshold value command or the falling-threshold value command. The range is from – 2147483647 to 214748364.
- The rising threshold value for 64-bit RMON alarms. Use the rising-threshold-high value command to configure the upper 32 bits of the 64-bit rising threshold value. Use the rising-threshold-low value command to configure the lower 32 bits of the 64-bit rising threshold value. The range is from 0 to 4294967295.
- The falling threshold value for 64-bit RMON alarms. Use the falling-threshold-high value command to configure the upper 32 bits of the 64-bit falling threshold value. Use the falling-threshold-low value command to configure the lower 32 bits of the 64-bit falling threshold value. The range is from 0 to 4294967295.
- The owner of the alarm.
Ensure you have configured an SNMP user and enabled SNMP notifications (see the “Configuring SNMP” section).
To configure RMON alarms, perform this task:
The following example shows how to configure RMON alarms:
switch(config)# rmon alarm 20 1.3.6.1.2.1.2.2.1.14 2900 delta rising-threshold 1500 1 falling-threshold 0 owner test
switch(config)# rmon alarm 20 1.3.6.1.2.1.2.2.1.14.16777216 2900 delta rising-threshold-high 15 rising-threshold-low 151 falling-threshold-high 0 falling-threshold-low 0 owner test
Configuring RMON Events
You can configure RMON events to associate with RMON alarms. You can reuse the same event with multiple RMON alarms.
Ensure you have configured an SNMP user and enabled SNMP notifications (see the “Configuring SNMP” section).
To configure RMON events, perform this task:
Verifying RMON Configuration
To display RMON configuration information, perform one of the following tasks:
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RMON Example Configuration
This example creates a delta rising alarm on ifInOctets.14 and associates a notification event with this alarm:
rmon alarm 20 1.3.6.1.2.1.2.2.1.14 2900 delta rising-threshold 1500 1 falling-threshold 0 owner test
Related Topics
Default Settings
Table 1-1 lists the default settings for RMON parameters.
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