08-ACL and QoS Command Reference

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03-Data buffer commands
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03-Data buffer commands 49.97 KB

Data buffer commands

Inappropriate data buffer changes can cause system problems. Before manually changing data buffer settings, make sure you understand its impact on your device. As a best practice, use the burst-mode enable command if the system requires large buffer spaces. The burst-mode enable command and the buffer apply command are mutually exclusive. If you have configured the data buffer by using one command, you must execute the undo form of the command before using the other command.

buffer apply

Use buffer apply to apply manually configured data buffer settings.

Use undo buffer apply to restore the default.

Syntax

buffer apply

undo buffer apply

Views

System view

Predefined user roles

network-admin

Usage guidelines

For data buffer settings to take effect, you must execute this command after configuring data buffer settings.

After applying manually configured data buffer settings, you cannot directly modify the applied settings. To modify them, you must cancel the application, reconfigure data buffer settings, and reapply the new settings.

Examples

# Apply manually configured data buffer settings.

<Sysname> system-view

[Sysname] buffer apply

buffer queue guaranteed

Use buffer queue guaranteed to set the fixed-area ratio for a queue.

Use undo buffer queue guaranteed to delete the fixed-area ratio setting of a queue.

Syntax

buffer egress [ slot slot-number ] { cell | packet } queue queue-id guaranteed ratio ratio

undo buffer egress [ slot slot-number ] { cell | packet } queue queue-id guaranteed

Default

The cell resource ratio for a queue is 12% of the total cell resources. The packet resource ratio for a queue is 12% of the total packet resources.

Views

System view

Predefined user roles

network-admin

Parameters

egress: Specifies the egress buffer.

slot slot-number: Specifies an IRF member device by its member ID (slot number). If you do not specify an IRF member device, this command applies to all IRF member devices.

cell: Specifies cell resources.

queue-id: Specifies a queue by its ID in the range of 0 to 7.

ratio ratio: Specifies the fixed-area ratio, in percentage. The value range for ratio is 1 to 100.

Usage guidelines

By default, all queues have an equal share of the fixed area. You can set the fixed-area ratio for a queue. The other queues equally share the remaining part.

The fixed-area space for a queue cannot be used by other queues. Therefore, it is also called the minimum guaranteed buffer for the queue. The sum of fixed-area ratios configured for all queues cannot exceed the total fixed-area ratio. Otherwise, the configuration fails.

Examples

# Configure queue 0 to use 20% fixed-area space of cell resources in the egress buffer.

<Sysname> system-view

[Sysname] buffer egress cell queue 0 guaranteed ratio 20

buffer shared

Use buffer shared to set the maximum shared-area ratio for each port or a queue.

Use undo buffer shared to delete the maximum shared-area ratio setting of each port or a queue.

Syntax

buffer egress [ slot slot-number ] { cell | packet } [ queue queue-id ] shared ratio ratio

undo buffer egress [ slot slot-number ] { cell | packet } [ queue queue-id ] shared

Default

The maximum packet resource ratio for a port is 10% of the total packet resources.

The maximum cell resource ratio for a port is 10% of the total cell resources.

Views

System view

Predefined user roles

network-admin

Parameters

egress: Specifies the egress buffer.

slot slot-number: Specifies an IRF member device by its member ID (slot number). If you do not specify an IRF member device, this command applies to all IRF member devices.

cell: Specifies cell resources.

packet: Specifies packet resources.

queue-id: Specifies a queue by its ID in the range of 0 to 7. If you do not specify a queue, this command sets the maximum shared-area ratio for each port.

ratio ratio: Specifies the maximum shared-area ratio, in percentage. The value range for ratio is 0 to 100.

Usage guidelines

By default, all ports or queueshave an equal share of the shared area. You can set the shared-area ratio for each port or a queue. The unconfigured queues use the default setting. The shared-area space for each port or queue is finally determined by the chip based on your configuration and the number of packets to be received and sent.

Examples

# Configure queue 0 to use up to 10% shared-area space of cell resources in the egress buffer.

<Sysname> system-view

[Sysname] buffer egress cell queue 0 shared ratio 10

buffer total-shared

Use buffer total-shared to set the total shared-area ratio.

Use undo buffer total-shared to delete the total shared-area ratio setting.

Syntax

buffer egress [ slot slot-number ] { cell | packet } total-shared ratio ratio

undo buffer egress [ slot slot-number ] { cell | packet } total-shared

Default

The default setting is 52% for cell resources and is 50% for packet resources.

Views

System view

Predefined user roles

network-admin

Parameters

egress: Specifies the egress buffer.

slot slot-number: Specifies an IRF member device by its member ID (slot number). If you do not specify an IRF member device, this command applies to all IRF member devices.

cell: Specifies cell resources.

packet: Specifies packet resources.

ratio ratio: Specifies the ratio of the shared area, in percentage. The value range for ratio is 0 to 100.

Usage guidelines

After you set the shared-area ratio, the remaining buffer space is automatically assigned to the fixed area.

Examples

# Configure the shared area to use 50% space of cell resources in the egress buffer.

<Sysname> system-view

[Sysname] buffer egress cell total-shared ratio 50

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:

·          Broadcast or multicast traffic is intensive, resulting in bursts of traffic.

·          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.

 

After the Burst feature is enabled, the following data buffer settings are changed:

·          Fixed-area ratio for a queue.

·          Shared-area ratio for a queue.

·          Total shared-area ratio.

You can display the data buffer setting changes by using the display buffer command.

 

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 ] [ queue [ queue-id ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

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

queue queue-id: Specifies a queue by its number in the range of 0 to 7. If you specify a queue, this command displays the fixed-area ratio and shared-area ratio for the specified queue. If you specify the queue keyword without the queue-id argument, this command displays the fixed-area ratio and shared-area ratio for each queue. If you do not specify the queue keyword, this command displays the total shared-area ratio.

Examples

# Display buffer size settings.

<Sysname> display buffer

Slot  Type    Eg(Total-shared , Shared)

1     packet  50 , 10

1     cell    52 , 10

 

          Eg: Size of the sending buffer

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

      Shared: Size of the maximum shared buffer per port

        Unit: Ratio

# Display the fixed-area ratio and shared-area ratio for the queues.

<Sysname> display buffer queue

Slot  Queue        Type    Eg(Guaranteed , Shared)

1     0-7          packet  12 , --

1     0-7          cell    12 , --

 

          Eg: Size of the sending buffer

  Guaranteed: Size of the minimum guaranteed buffer per queue

      Shared: Size of the maximum shared buffer per queue

        Unit: Ratio

Table 1 Command output

Field

Description

Type

Resource type: packet or cell.

Queue

Queue ID in the range of 0 to 7.

Eg

Egress buffer.

(Total-shared , Shared)

Total-shared indicates the total shared-area ratio. Shared indicates the shared-area ratio of a port.

(Guaranteed , Shared)

Guaranteed indicates the fixed-area ratio of a queue. Shared indicates the shared-area ratio of a queue.

If the device does not support a resource type, this field displays two hyphens (--).