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WRED command
use-wred-slopes
Syntax
no use-wred-slopes
use-wred-slopes slope-type
Context
config>system>qos
Description
The user is provided with an 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: This command is applicable only to 7210 SAS-D devices.
The no form of the command enables use of 3 WRED slopes per queue.
Default
use-wred-slopes tcp-non-tcp to maintain backward compatibility.
Parameters
High and Low slope type —
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-TCP slope type —
slope, Low priority/out-of-profile TCP WRED slope, and non-TCP WRED slope) that are used per
queue when TCP-non-tcp slope is set.
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>
7210 SAS D, E, K OS Quality of Service Guide
When high-low is set, 2 slopes are used per queue. High priority/In-profile
There are 3 WRED slopes (High priority/In-profile TCP WRED
Operational Commands
Page 511
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