WRED command for 7210 SAS-D

Parent topic: Operational commands

use-wred-slopes

Syntax

use-wred-slopes slope-type

no use-wred-slopes

Context

config>system>qos

Platforms

7210 SAS-D

Description

This command provides the user with the option to use 2 WRED slopes per queue or use 3 WRED slopes per queue. It is a global option which affects all the queues in the system. In other words, user can choose to use either 2 WRED slopes for all queues in the system or 3 WRED slopes for all queues in the system.

Using 3 WRED slopes per queue allows differentiating tcp in-profile traffic, tcp out-of-profile traffic, and non-tcp traffic. For non-tcp traffic both in and out profile use the same slope.

Using 2 WRED slopes per queue allows differentiating in-profile and out-of-profile traffic, without further differentiation of tcp and non-tcp traffic. All traffic, irrespective of tcp or non-tcp traffic, uses either in-profile slope or out-of-profile slope, depending on the profile assigned to the traffic by the ingress meters.

Note:

See Table: Slope behavior (applicable to 7210 SAS-D) for information about the mapping of traffic types to use high-slope, low-slope, and non-TCP-slope parameters on 7210 SAS-D.

The no form of this command enables the use of 3 WRED slopes per queue.

Default

use-wred-slopes tcp-non-tcp to maintain backward compatibility.

Parameters

slope-type

Specifies the slope policy type.

Values

High and Low slope type: When high-low is set, two slopes are used per queue. High priority/In-profile slope for all packets that are classified as in-profile by the ingress meter and Low priority/out-of-profile slope for all packets that are classified as out-of-profile by the ingress meter. The high-priority/in-profile WRED slope uses the values configured under config>qos>slope-policy>high-slope. The low-priority/out-of-profile WRED slope uses the values configured under config>qos>slope-policy>low-slope. The values configured under non-TCP WRED slope is ignored by the system.

TCP and Non-TXP slope type: The non-TCP WRED slope is used for all packets classified as non-TCP packets on ingress, irrespective of the packet's profile or priority. Packets classified as TCP and determined to be high-priority/in-profile by the ingress meter, uses the high priority TCP WRED slope. This slope uses the values configured under config>qos>slope-policy>high-slope. Packets classified as TCP and determined to be low-priority/out-of-profile by the ingress meter, uses the low-priority TCP WRED slope. The low-priority/out-of-profile TCP WRED slope uses the values configured under config>qos>slope-policy>low-slope. The non-TCP WRED slope uses the values configured under config>qos>slope-policy>non-tcp-slope.