Contents

Data buffer commands· 1

buffer usage threshold· 1

burst-mode enable· 1

display buffer 2

display buffer usage interface· 2

 

Data buffer commands

buffer usage threshold

Use buffer usage threshold to set a per-interface buffer usage threshold.

Use undo buffer usage threshold to restore the default.

Syntax

buffer usage threshold slot slot-number ratio ratio

undo buffer usage threshold slot slot-number

Default

The per-interface buffer usage threshold is 100%.

Views

System view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies an IRF member device by its member ID.

ratio ratio: Specifies the buffer usage threshold in percentage, in the range of 1 to 100.

Usage guidelines

This command takes effect only when the packet statistics collection mode is queue (configured by using the statistic mode queue command).

After you configure this command, the switch automatically records buffer usage for each interface. When a queue on an interface uses more buffer space than the set threshold, the system counts one threshold violation for the queue.

To display the buffer usage statistics for interfaces, use the display buffer usage interface command.

Examples

# Set the per-interface buffer usage threshold to 50% for IRF member device 1.

<Sysname> system-view

[Sysname] buffer usage threshold slot 1 ratio 50

Related commands

display buffer usage interface

burst-mode enable

Use burst-mode enable to enable the Burst feature.

Use undo burst-mode enable to disable the Burst feature.

Syntax

burst-mode enable

undo burst-mode enable

Default

The Burst feature is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

The Burst feature is especially useful for reducing packet losses under the following circumstances:

·     Traffic enters a device from a high-speed interface and goes out of a low-speed interface.

·     Traffic enters a device from multiple same-rate interfaces and goes out of an interface with the same rate.

The Burst feature takes effect only on known unicast packets.

 

 

Examples

# Enable the Burst feature.

<Sysname> system-view

[Sysname] burst-mode enable

display buffer

Use display buffer to display buffer size settings.

Syntax

display buffer [ slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

slot slot-number: Specifies an IRF member device by its slot number. If you do not specify an member device, this command displays buffer size settings for all member devices.

Examples

# Display buffer size settings for slot 0 in chassis 1.

<Sysname> display buffer

Slot  Type    Eg(Total-shared)                                                 

1     cell    --                                                               

                                                                                

          Eg: Size of the sending buffer                                       

Total-shared: Size of the shared buffer for all ports                          

        Unit: Ratio

display buffer usage interface

Use display buffer usage interface to display buffer usage statistics for interfaces.

Syntax

display buffer usage interface [ interface-type [ interface-number ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

interface-type [ interface-number ]: Specifies an interface by its type and number. If you do not specify the interface-type argument, this command displays buffer usage statistics for all Ethernet interfaces. If you specify the interface-type argument without the interface-number argument, this command displays buffer usage statistics for all Ethernet interfaces of the specified type.

Examples

# Display buffer usage statistics for Ten-GigabitEthernet 1/0/1.

<Sysname> display buffer usage interface ten-gigabitethernet 1/0/1

Interface              QueueID Total       Used        Threshold(%) Violations

--------------------------------------------------------------------------------

XGE1/0/1               0       761856      0           100           0

                       1       761856      0           100           0

                       2       761856      0           100           0

                       3       761856      0           100           0

                       4       761856      0           100           0

                       5       761856      0           100           0

                       6       761856      0           100           0

                       7       761856      0           100           0

Table 1 Command output

Field	Description
Total	Data buffer size in bytes allowed for a queue.
Used	Data buffer size in bytes that has been used by a queue.
Threshold(%)	Buffer usage threshold for a queue. The threshold value is the same as the per-interface threshold value.
Violations	Number of threshold violations for a queue. The value of this field is reset upon a switch reboot.

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