Backplane Traffic Monitoring

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Note ●blank.gif For complete syntax and usage information for the commands used in this chapter, see these publications:

http://www.cisco.com/en/US/products/ps11846/prod_command_reference_list.html

  • Cisco IOS Release 15.4SY supports only Ethernet interfaces. Cisco IOS Release 15.4SY does not support any WAN features or commands.

 

Tip For additional information about Cisco Catalyst 6500 Series Switches (including configuration examples and troubleshooting information), see the documents listed on this page:

http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.html

Participate in the Technical Documentation Ideas forum

 

Prerequisites for Backplane Traffic Monitoring

None.

Restrictions for Backplane Traffic Monitoring

The syslog message buffer is limited in size. To reduce false alarms and the number of syslog messages, use the following guidelines:

  • Traffic can occur in bursts. If a small number of bursts occur in a monitoring interval, it does not represent a capacity overload issue for the system; the hardware buffers are able to absorb the effects and not cause packet drops. For an example, if you set a monitoring interval to 10 seconds and the threshold to 80 percent, there are a total of 10 traffic utilization readings. Assume only 2 of the readings reached 90 percent and the other 8 readings are 20 percent. If the peak threshold of 90 percent is used to compare with the threshold, an unwanted warning syslog message is generated. It is better to use the average 34 percent of the 10 readings to compare with the threshold and not generate warning messages in this case. If the peak value comparison is really needed, you can set the interval to 1 second. Setting the interval to 1 second compares the reading directly with the threshold.
  • The number of syslog messages that generate syslog messages are from below the threshold and above the threshold.

Information About Traffic Monitoring

Backplane Traffic Monitoring can monitor the backplane and fabric-channel traffic utilization at a configured interval and threshold.

Traffic monitoring allows the switch to monitor the backplane and fabric channel traffic utilization at a configured interval and threshold. Syslog messages are generated when the traffic utilization is above or below the configured threshold. The following examples show several types of syslog messages:

  • 00:08:03: %TRAFFIC_UTIL-SP-4-MONITOR_BACKPLANE_REACH_THR: Backplane traffic utilization is 26%, reached threshold(20%) within 10 second interval
  • 00:08:13: %TRAFFIC_UTIL-SP-4-MONITOR_BACKPLANE_BELOW_THR: Backplane traffic utilization is 18%, below threshold(20%) within 10 second interval
  • 00:08:44: %TRAFFIC_UTIL-SP-4-MONITOR_FABRIC_IG_REACH_THR: Module 1, Channel 0 ingress traffic utilization is 5%, reached threshold(3%) within 30 second interval
  • 00:08:44: %TRAFFIC_UTIL-SP-4-MONITOR_FABRIC_EG_REACH_THR: Module 1, Channel 0 egress traffic utilization is 5%, reached threshold(3%) within 30 second interval
  • 00:09:14: %TRAFFIC_UTIL-SP-4-MONITOR_FABRIC_IG_BELOW_THR: Module 1, Channel 0 ingress traffic utilization is 1%, below threshold(3%) within 30 second interval
  • 00:09:14: %TRAFFIC_UTIL-SP-4-MONITOR_FABRIC_EG_BELOW_THR: Module 1, Channel 0 egress traffic utilization is 1%, below threshold(3%) within 30 second interval

Default Settings for Backplane Traffic Monitoring

  • The default threshold is 80 percent.
  • Traffic monitor is off by default.

How to Configure Backplane Traffic Monitoring

To configure the Backplane Traffic Monitoring feature, perform one or more of the following tasks:

 

Command
Purpose

Router(config)# monitor traffic-util backplane interval interval threshold percentage

Configures the backplane utilization traffic monitoring.
Router(config)# monitor traffic-util fabric module { mod-num | all } { channel { 0 | 1 | both }} { direction { egress | ingress | both }} [ interval interval threshold percentage ]

Configures the fabric channel utilization traffic monitoring.
Router(config)# monitor traffic-util fabric logging interval second

Configures the fabric channel utilization traffic monitor SYSLOG interval when the traffic utilization is in the crossed state.
Router(config)# monitor traffic-util backplane logging interval second

Configures the traffic monitor backplane SYSLOG interval when the traffic utilization is in the crossed state.

Router# show catalyst6000 traffic-meter

Displays the percentage of the backplane (shared bus) utilization and traffic monitor status information.

When configuring a range of interfaces, you can enter the mod-num as a list or a range. Separate each entry with a comma and each range with a hyphen (-). For example, 1,3,5-9,12.

The following example shows how to enable backplane traffic utilization monitoring:

Router(config)# monitor traffic-util backplane logging interval 50 threshold 100
 

The following example shows how to disable backplane traffic utilization monitoring:

Router(config)# no monitor traffic-util backplane
 

The following example shows how to specify the fabric channel traffic utilization monitor interval and threshold for a fabric channel on a specific module:

Router(config)# monitor traffic-util fabric module 8 channel both direction both interval 50 threshold 60
 

The following example shows how to specify the fabric channel traffic utilization monitor threshold for a specific fabric channel and for egress traffic only:

Router(config)# monitor traffic-util fabric module 6 channel 0 direction egress interval 100 threshold 90

Tip For additional information about Cisco Catalyst 6500 Series Switches (including configuration examples and troubleshooting information), see the documents listed on this page:

http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.html

Participate in the Technical Documentation Ideas forum