Micro-Burst Monitoring Overview

The micro-burst monitoring feature allows you to monitor traffic on a per-port basis for both ingress andegress ports and to detect unexpected data bursts within a very small time window (micro-seconds). Thisallows you to detect flows in the network that are at risk of data loss, and that may require extra bandwidth.

A micro-burst occurs when a specific amount of data (in bytes) is exceeded in a given time interval. Themicro-burst monitoring feature allows you to specify these limits as absolute values (for data and burst size)or as a percentage of the link speed.When these thresholds are exceeded the system generates a Syslog alarmmessage.

• Micro-Burst Monitoring, page 1

Micro-Burst Monitoring

Information About Micro-Burst Monitoring

How to Use Micro-Burst MonitoringThe micro-burst monitoring feature monitors bursts in real time. The monitoring process also provides anoverview of data path issues, and is helpful in identifying potential capacity issues in a network. Syslogmessages are generated with the burst exceeds the configured value.

Micro-burst monitoring provides real-time burst information that is used to:

• monitor network micro bursts

• trigger to congestion detection and latency processes

Guidelines and Limitations for Micro-Burst Monitoring• Micro-burst detection is performed on a per-link basis and port channels are not be taken intoconsideration.

• Micro-burst detection is supported on Ethernet ports only, and is not supported on Fabric ExtenderTechnology (FEX), Port Channels, Virtual Ethernet (VETH), or Virtual Fibre Channel (VFC) ports.

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How to Configure Micro-Burst Monitoring

Configuring Micro-Burst MonitoringTo configure micro-burst monitoring you first set micro-burst threshold values for an interface and thenconfigure the maximum number of micro-bursts allows on the interface. You configure ingress and egressport settings separately.

Procedure

PurposeCommand or Action

Enables privileged EXEC mode. Enter yourpassword if prompted.

enable

Example:switch> enable

Step 1

Enters global configuration mode.configure terminal

Example:switch# configure terminalswitch(config)#

Step 2

Enters interface configuration mode.interface ethernet slot/port

Example:switch(config)# interface ethernet 1/1

Step 3

Configures micro-burst threshold values for ingresstraffic on the interface.

burst threshold ingress limit percentinterval interval_time

Example:switch(config-if)# burst thresholdingress limit 60 interval 10000000

Step 4

Configures micro-burst threshold values for egresstraffic on the interface.

burst threshold egress size max_bytesinterval interval_time

Example:switch(config-if)# burst thresholdegress size 500000 interval 16000

Step 5

Configures the maximum number of micro-burstsallowed within a time interval before generating

burst maximum egress burst-countmax_bytes

Step 6

an interrupt on a port in the egress direction. ThisExample:switch(config-if)# burst maximumegress burst-count 50000

time interval is equal to 10 multiplied by themicro-burst threshold interval (in seconds).

Configures the maximum number of micro-burstsallowed within a time interval before generating

burst maximum ingress burst-countmax_bytes

Step 7

an interrupt on a port in the ingress direction. This

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Micro-Burst Monitoring OverviewHow to Configure Micro-Burst Monitoring

PurposeCommand or Action

Example:switch(config-if)# burst maximumingress burst-count 600000

time interval is equal to 10 multiplied by themicro-burst threshold interval (in seconds).

Updates the configuration and exits interfaceconfiguration mode.

exit

Example:switch(config-if)# exit

Step 8

(Optional)Saves the change persistently through reboots andrestarts by copying the running configuration tothe startup configuration.

copy running-config startup-config

Example:switch(config)# copy running-configstartup-config

Step 9

Verifying Micro-Burst MonitoringTo display micro-burst monitoring information, enter the following show command:

PurposeCommand

Displays micro-burst counters information for allinterfaces wheremicro-burst monitoring is configured.

show interface burst-counters

Example for Micro-Burst Monitoring

Configuraion Example for Micro-Burst MonitoringThe following example shows how to configure micro-burst monitoring on an Ethernet interface:

switch# configuration terminalswitch(config)# interface ethernet 1/1switch(config-if)# burst threshold egress limit 50 interval 30switch(config-if)# burst threshold ingress size 500000 interval 16000switch(config-if)# burst maximum egress burst-count 50000switch(config-if)# burst maximum ingress burst-count 600000switch(config-if)# exitswitch(config)# copy running-config startup-config

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Micro-Burst Monitoring OverviewExample for Micro-Burst Monitoring

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Micro-Burst Monitoring OverviewExample for Micro-Burst Monitoring