Administrator Guide
Parameters
service-class Define the mapping between the service class and policy-based QoS or routing.
wred Specify WRED curve parameters for a queue
green Specify green (low) drop precedence to a queue.
weight Specify a weight factor to a queue.
yellow Specify yellow (medium) drop precedence to a queue.
queue 0 to queue 7 Specify the queue number to which the WRED parameters apply.
number
Enter a weight for the queue as a number in the range of 1 to 15. This parameter applies
only if you specify the green or yellow drop precedence.
string
Enter the WRED profile name. It is a string of up to 32 characters. Or use one of the five
pre-defined WRED profile names. Pre-defined Profiles: wred_drop, wred-ge_y,
wred_ge_g, wred_teng_y, wred_teng_. This parameter applies only if you specify a
weight factor.
backplane Specify that the WRED weight and profile configured for each queue apply to backplane
ports.
Default All queues on backplane ports operate in tail-drop (best-effort traffic) mode by default. There is no default WRED
green or yellow profile. The default weight is 0.
Command Modes QOS-POLICY-OUT mode
Command History
Version Description
9.9(0.0) Introduced on the C9010.
9.2.1.0 Introduced on the Z9500 switch.
9.3.0.0 Introduced on the Z9000 platform.
Usage Information You can configure queues 0-7. WRED profile contains a set of characteristics, such as the minimum and maximum
WRED thresholds and the maximum drop rate. You can add and remove WRED parameters for one or more
queues by using the command in a single line. All of the configured attributes apply to all the backplane ports and
are for each queue. To assign drop precedence to green or yellow traffic, use this command. If there is no
honoring enabled on the input, all the traffic defaults to green drop precedence.
Example
Dell(conf-wred)#wred thresh-1
Dell(conf-wred)#threshold min 100 max 200 max-drop-rate 40
Dell(conf-wred)#wred thresh-2
Dell(conf-wred)#threshold min 300 max 400 max-drop-rate 80
Dell(conf)#service-class wred green queue5 thresh-1 queue7 thresh-2 backplane
Dell(conf)#service-class wred yellow queue1 thresh-2 queue3 thresh-1
backplane
Dell(conf)#service-class wred weight queue0 11 queue6 4 queue7 9 backplane
service-pool wred
Configure a global buffer pool that serves as a shared buffer accessed by multiple queues when the minimum guaranteed buffers for a
queue are consumed.
The switch supports four global service-pools in the egress direction. Two service pools are used—one for lossy queues and the other for
lossless (priority-based flow control (PFC)) queues. You can enable WRED and ECN operation on the global service-pools. You can define
WRED profiles and weight on each of the global service-pools for both lossy and lossless (PFC) service-pools.
C9000 Series
Syntax
[no] buffer-pool wred {green | weight | yellow} {[pool0 number/string] ||
[pool1 number/string]}
Parameters
buffer-pool Define the mapping between the service class and policy-based QoS or routing.
1354 Quality of Service (QoS)