Remote Network Monitoring and AlarmTroubleshooting

This chapter describes remote network monitoring (RMON) and alarm troubleshooting.

• RMON Procedures, page 1

• Understanding RMON, page 1

• Alarm Troubleshooting, page 4

RMON ProceduresTo configure RMON using Cisco IOS commands, complete the following procedures:

• Configuring RMON Settings, on page 2

• Displaying RMON Status, on page 3

Understanding RMONRMON is a standard monitoring feature that allows various network agents and console systems to exchangenetwork monitoring data. RMON provides you with comprehensive network-fault diagnosis, planning, andperformance-tuning information. You can use the RMON feature with the Simple Network Management

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Protocol (SNMP) agent in the switch to monitor all the traffic flowing among switches on all connected LANsegments 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.

Configuring RMON Settings

SUMMARY STEPS

1. enable2. configure terminal3. rmon alarm number variable interval {delta | absolute} rising-threshold value [event-number]

falling-threshold value [event-number] [owner string]4. rmon event number [log] [trap community] [description string] [owner string]5. exit

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode.enableStep 1

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Remote Network Monitoring and Alarm TroubleshootingConfiguring RMON Settings

PurposeCommand or Action

Example:Switch# enable

• Enter your password if prompted.

Enters global configuration mode.configure terminal

Example:Switch# configure terminal

Step 2

l

Sets a RMON alarm on a MIB object.rmon alarm number variable interval {delta |absolute} rising-threshold value

Step 3

This example configures RMON alarm number 10. The alarmmonitorsthe MIB variable ifEntry.20.1 once every 20 seconds until the alarm is[event-number] falling-threshold value

[event-number] [owner string] disabled, and checks the change in the rise or fall of the variable. If the

Example:Switch(config)# rmon alarm 10ifEntry.20.1 20 delta rising-threshold15 1 falling-threshold 0 owner user1

ifEntry.20.1 value shows a MIB counter increase of 15 or more, suchas from 100000 to 100015, the alarm is triggered. The alarm in turntriggers event number 1, which is configured with the rmon eventcommand. The possible events include a log entry or an SNMP trap. Ifthe ifEntry.20.1 value changes by 0, the alarm is reset and can betriggered again.

Adds or removes an event in the RMON event table that is associatedwith an RMON event number.

rmon event number [log] [trap community][description string] [owner string]

Step 4

Example:Switch(config)# rmon event 1 log trapeventtrap description "High ifOutErrors"owner user

This example creates RMON event number 1, which is defined asHighifOutErrors, and generates a log entry when the event is triggered byan alarm. The user user owns the row that is created in the event tableby this command. This example also generates a Simple NetworkManagement Protocol (SNMP) trap when the event is triggered.

Exits configuration mode.exit

Example:Switch(config)# exit

Step 5

Displaying RMON StatusTo display the current RMON agent status on the device, use one or more of the privileged EXEC commandsdescribed in Table 1: Commands for Displaying RMON Status, on page 3.

Table 1: Commands for Displaying RMON Status

PurposeCommand

Displays the RMON alarm table.show rmon alarms

Displays the RMON event table.show rmon events

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Remote Network Monitoring and Alarm TroubleshootingDisplaying RMON Status

Alarm TroubleshootingThis section gives a description, severity, and troubleshooting procedure for each commonly encounteredCisco ME 2600X alarm and condition.

Trouble-Clearing ProceduresThis section list alarms alphabetically and includes some conditions commonly encountered whentroubleshooting alarms. The severity, description, and troubleshooting procedure accompany each alarm andcondition.

When checking alarms, ensure that alarm suppression is not enabled on the port.Note

FMEA FAN AlarmDefault Severity: Critical (CR), Service-Affecting (SA)

This alarm gets raised when a power failure has encountered in any of the fan modules.

Precondition:

Make sure FMEA is enabled on Cisco ME 2600X. If not issue 'fmea enable 1' on Cisco ME 2600X.

Clearing the FMEA FAN Alarm

SUMMARY STEPS

1. Check all connections are intact inside the module and replace the fan module.

DETAILED STEPS

Check all connections are intact inside the module and replace the fan module.Sample output for FMEA:

*Nov 28 14:04:20.366: %NGXP_FMEA-1-ALARM: FMEA Alarm Notification for index:23Fault Desc:FAN.01:FAN alarm with Timestamp:14:04:23 UTC 2012-11-28

To view the last occurrence of FMEA alarm:

Switch# fmea alarms

Alarm raised:Count:1 Index:23=>FAN.01:FAN alarmFirstTimeStamp:13:58:23 UTC 2012-11-28 CurTimeStamp:14:02:23 UTC 2012-11-28

If the condition does not clear, log into the Technical Support Website at http://www.cisco.com/cisco/web/support/index.html for more information or call Cisco TAC (1 800 553-2447).

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Remote Network Monitoring and Alarm TroubleshootingAlarm Troubleshooting

MAC-BD-LIMT-REACHEDDefault Severity: Minor (MN), Non-Service-Affecting (NSA)

The MAC Bridge Domain Limit Reached (MAC-BD-LIMT-REACHED) alarm is raised when the MACaddress learnt on the bridge domain has reached a limit of 32,000.

Clearing the MAC-BD-LIMT-REACHED Alarm

SUMMARY STEPS

1. Reduce the MAC address size on the bridge domain.

DETAILED STEPS

Reduce the MAC address size on the bridge domain.If the condition does not clear, log into the Technical Support Website at http://www.cisco.com/cisco/web/support/index.html for more information or call Cisco TAC (1 800 553-2447).

MAC-SYS-LIMT-REACHEDDefault Severity: Minor (MN), Non-Service-Affecting (NSA)

The MAC System Limit Reached (MAC-SYS-LIMT-REACHED) alarm is raised when the system MACaddress limit of 32,000 is reached.

Clearing the MAC-SYS-LIMT-REACHED Alarm

SUMMARY STEPS

1. Reduce the system MAC address size to less than 32,000.

DETAILED STEPS

Reduce the system MAC address size to less than 32,000.If the condition does not clear, log into the Technical Support Website at http://www.cisco.com/cisco/web/support/index.html for more information or call Cisco TAC (1 800 553-2447).

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Remote Network Monitoring and Alarm TroubleshootingTrouble-Clearing Procedures

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Remote Network Monitoring and Alarm TroubleshootingTrouble-Clearing Procedures