qos red-profile

Syntax

qos red-profile profile-ID min-threshold min-percentage max-threshold max-percentage drop-probability percentage ecn { on | off }

no qos red-profile profile-ID

Parameters

profile-ID: Specifies the profile identifier. Enter an integer from 0 to 383.
min-threshold min-percentage: Specifies the minimum average queue size in percentage for randomly dropping packets. Enter an integer from 0 through 100.
max-threshold max-percentage: Specifies the maximum average queue size in percentage which all packets are accepted by the device. Enter an integer from 0 through 100.
drop-probability percentage: Specifies the drop probability in percentage when the queue size is at the maximum. Enter an integer from 0 through 100.
ecn on off: Enables or disables Explicit Congestion Notification (ECN) feature.

Modes

Global configuration mode

Usage Guidelines

You can configure a maximum on 256 profiles.

After configuring the profile, apply it to an interface with the qos random-detect traffic-class command.

Use the no form of this command to delete the profile.

Use the ecn {on | off} command to enable or disable Explicit Congestion Notification (ECN) for this device. ECN allows the routers and switches to signal the traffic end-points of the congestion without dropping any frames, and thus the end-points can adjust their transmission rates without the added latency and jitter that would have been introduced by dropped frames.

When a device detects a congestion, it is imperative that the device indicates to the other end-points about the congestion as soon as it is detected. Since a congestion in one direction need not imply a congestion in its opposite direction, this device has to indicate to the other end-point so that it, the other end-point, can take appropriate action.

ECN requires that Random Early Detection (RED) profiles are created using the red-profile command and applied to the interface. ECN is only available for Unicast frames.

Examples

The following example is a WRED configuration.

device# configure terminal
device(config)# qos red-profile 1 min-threshold 30 max-threshold 60 drop-probability 44 ecn on