unknown-unicast-suppression

Function

The unknown-unicast-suppression command configures the traffic suppression for unknown unicast packets in the QoS profile.

The undo unknown-unicast-suppression command cancels the traffic suppression that is configured for unknown unicast packets in the QoS profile.

By default, unknown unicast suppression is not configured in the QoS profile view.

Format

unknown-unicast-suppression cir cir-value [ cbs cbs-value ] [ inbound | outbound ]

undo unknown-unicast-suppression [ inbound | outbound ]

Parameters

Parameter	Description	Value
cbs cbs-value	Specifies the CBS.	The value is an integer in the range of 0 bytes to 4,294,967,295 bytes. The cbs-value must be greater than the configured cir-value. The default value varies with the value of cir-value: cbs-value = cir-value * 187. If cir-value<100000 kbit/s, the default value of cbs-value equals cir-value * 187 (in bytes). If cir-value >=100000 kbit/s, the default value of cbs-value equals 100000*187 (in bytes).
inbound	Indicates the inbound direction of an interface.	-
outbound	Indicates the outbound direction of an interface.	-
cir cir-value	Specifies the CIR.	The value is an integer that ranges from 0 kbit/s to 4,294,967,295 kbit/s.

Views

QoS profile view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
qos	write

Usage Guidelines

Usage Scenario

When unknown unicast packets grow on a network, resources consumed by unknown unicast packets increase accordingly, affecting running services on the network.

The unknown-unicast-suppression command configures unknown unicast traffic suppression in the QoS profile. When the number of unknown unicast packets exceeds the configured threshold, the system drops excess unknown unicast packets so that the unknown unicast traffic volume can be restricted within a proper range.

Precautions

The unknown unicast suppression in the QoS profile does not take effected in VLL scenario.

To achieve an exact packet suppression, you should specify a value for the CBS that is 10 times the length of the packet.

Direction-oriented and directionless unknown unicast suppression cannot be configured at the same time. If direction-oriented unknown unicast suppression is configured on an interface, the configuration takes effect only when the direction to which the QoS profile applies is the same as the direction configured for unknown unicast suppression.

Example

# Configure an unknown unicast suppression on a QoS profile named test. Set the CIR of packets to 38400 kbit/s. If the rate is <= 38400 kbit/s, packets are sent normally. Otherwise, packets are discarded.

<HUAWEI> system-view
[~HUAWEI] qos-profile test
[*HUAWEI-qos-profile-test] unknown-unicast-suppression cir 38400