The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
The micro-burst monitoring feature allows you to monitor traffic on a per-port basis for both ingress and egress ports and to detect unexpected data bursts within a very small time window (micro-seconds). This allows 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. The micro-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 alarm message.
Micro-Burst Monitoring
Information About Micro-Burst Monitoring
The micro-burst monitoring feature monitors bursts in real time. The monitoring process also provides an overview of data path issues, and is helpful in identifying potential capacity issues in a network. Syslog messages are generated with the burst exceeds the configured value.
Micro-burst detection is performed on a per-link basis and port channels are not be taken into consideration.
Micro-burst detection is supported on Ethernet ports only, and is not supported on Fabric Extender Technology (FEX), Port Channels, Virtual Ethernet (VETH), or Virtual Fibre Channel (VFC) ports.
How to Configure Micro-Burst Monitoring
To configure micro-burst monitoring, you first set micro-burst threshold values for an interface and then configure the maximum number of micro-bursts allowed on the interface. You configure ingress and egress port settings separately.
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
configure terminal Example: |
Enters global configuration mode. |
| Step 2 |
interface ethernet slot/port Example: |
Enters interface configuration mode. |
| Step 3 |
burst threshold ingress limit percent interval interval_time Example: |
Configures micro-burst threshold values for ingress traffic on the interface. |
| Step 4 |
burst threshold egress size max_bytes interval interval_time Example: |
Configures micro-burst threshold values for egress traffic on the interface. |
| Step 5 |
burst maximum egress burst-count max_bytes Example: |
Configures the maximum number of micro-bursts allowed within a time interval before generating an interrupt on a port in the egress direction. This time interval is equal to 10 multiplied by the micro-burst threshold interval (in seconds). |
| Step 6 |
burst maximum ingress burst-count max_bytes Example: |
Configures the maximum number of micro-bursts allowed within a time interval before generating an interrupt on a port in the ingress direction. This time interval is equal to 10 multiplied by the micro-burst threshold interval (in seconds). |
| Step 7 |
exit Example: |
Updates the configuration and exits interface configuration mode. |
| Step 8 |
clear burst-counters [interface {all | ethernet interface}] {both | egrees | ingress } Example: |
Clears the micro-burst counters on all interfaces or only on ethernet interfaces. Additionally, the command is applicable to clear counters for both egress and ingress or either egress or ingress traffic. |
| Step 9 |
(Optional) copy running-config startup-config Example: |
(Optional)
Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. |
To display micro-burst monitoring information, enter the following show command:
| Command | Purpose |
|---|---|
|
show interface burst-counters |
Displays micro-burst counters information for all interfaces where micro-burst monitoring is configured. |
Example for Micro-Burst Monitoring
The following example shows how to configure micro-burst monitoring on an Ethernet interface:
switch# configure terminal
switch(config)# interface ethernet 1/1
switch(config-if)# burst threshold egress limit 50 interval 30
switch(config-if)# burst threshold ingress size 500000 interval 16000
switch(config-if)# burst maximum egress burst-count 50000
switch(config-if)# burst maximum ingress burst-count 600000
switch(config-if)# exit
switch(config)# copy running-config startup-config
Feedback