qos burst-mode (interface view)

Function

The qos burst-mode command configures a burst traffic buffer mode on an interface.

The undo qos burst-mode command restores the default burst traffic buffer mode on an interface.

By default, an interface uses the standard mode.

Only the S5720-EI, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.

Format

qos burst-mode { enhanced | extreme }

undo qos burst-mode { enhanced | extreme }

Parameters

Parameter	Description	Value
enhanced	Indicates the enhanced burst traffic buffer mode.	-
extreme	Indicates the extreme burst traffic buffer mode.	-

Views

GE interface view, XGE interface view, MultiGE interface view, 25GE interface view, 40GE interface view, 100GE interface view, port group view

Default Level

2: Configuration level

Usage Guidelines

Scenario

By default, the buffer size on an interface is small. When the traffic rate on an interface reaches 50% to 60% of the interface bandwidth, packet loss occurs. The burst traffic buffer mode enables an interface to occupy more available buffer space in the system to process burst traffic, improving a switch's packet processing performance.

The device buffer is allocated in static and dynamic modes. By default, each interface is allocated some static buffer space for the basic buffer requirement. The remaining buffer space is used as the dynamic buffer for a switch.

In standard mode, an interface can occupy only some dynamic buffer space on the switch.

In enhanced mode, an interface can occupy only some dynamic buffer space on the switch, and more dynamic buffer space than that in standard mode.

In extreme mode, an interface occupies the dynamic buffer space as well as static buffer space on interfaces in non-extreme mode.

Precautions

The qos burst-mode (interface view) and qos queue buffer shared-ratio commands cannot be used on the same interface.

When the enhanced mode is used, the qos burst-mode (interface view) and qos burst-mode (system view) commands cannot be used together.

The extreme mode is not recommended because forwarding of other interfaces may be affected and QoS results such as scheduling and shaping results may be incorrect.

The extreme mode is used only when the switch uses one or two interfaces. This mode takes effect only when it is configured globally and on an interface. If the extreme mode is configured globally but is not configured on an interface, traffic forwarding may be abnormal and multicast packets may fail to be obtained. If the extreme mode is configured on an interface but is not configured globally, the extreme mode does not take effect.

When the extreme mode is configured globally, the interface where the extreme mode is not configured cannot be used as a service interface.

Example

# Configure the enhanced burst traffic buffer mode on the GE0/0/1.

<HUAWEI> system-view
[HUAWEI] interface gigabitethernet 0/0/1 
[HUAWEI-GigabitEthernet0/0/1] qos burst-mode enhanced