Service Manual

yellow Specify yellow (medium) drop precedence to a queue.
pool0 Service-pool buer 1 (default service-pool for PFC trac) .
pool1 Service-pool buer 0 (default service-pool for lossy trac).
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 prole name. It is a string of up to 32 characters. Or use one of
the ve pre-dened WRED prole names. Pre-dened Proles: wred_drop, wred-
ge_y, wred_ge_g, wred_teng_y, wred_teng_. This parameter applies only if you
specify a weight factor.
Default All queues on backplane ports operate in tail-drop (best-eort trac) mode by default. There is no default
WRED green or yellow prole. The default weight is 0.
Command Modes CONFIGURATION mode
Command History
Version Description
9.7(0.0) Introduced on the S6000-ON.
9.3.0.0 Introduced on the S6000 and Z9000 platforms
Usage Information You can congure only service pools 0 and 1 because the Dell Networking OS uses only these two service
pools. The pool, service0, is used for lossy queues and the pool, service1, is used for lossless (PFC) queues in
all the platforms.
You can congure the weight for the WRED average queue size for service1 on the S6000 Switch, which is
the only platform in which PFC is supported for this service pool. On the Z9000 Switch, only service0 can
be congured because it does not support PFC.
A WRED prole contains a set of attributes, such as the minimum and maximum threshold values, and the
maximum drop rate for the received packets. You can add or remove WRED parameter congurations for
one or more shared service pools using a single command. The service-pool wred command is similar
in usage and working to the service-class bandwidth-percentage queue-id command.
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-pool wred green pool0 thresh-1 pool1 thresh-2
Dell(conf) #service-pool wred yellow pool0 thresh-3 pool1 thresh-4
Dell(conf) #service-pool wred weight pool0 11 pool1 4
Quality of Service (QoS)
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