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Data Traffic
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
The DWRR scheduler services the queues in the ratio of the configured weights. Higher weights translate
to proportionally higher bandwidth and lower latency. The default weights are 50 for the high queue, 30
for the medium queue, and 20 for the low queue. Decreasing order of queue weights is mandated to
ensure the higher priority queues have a higher service level, though the ratio of the configured weights
can vary (for example, one can configure 70:30:5 or 60:50:10 but not 50:70:10).
Use the qos dwrr-q command to associate a weight with a DWRR queue. Use the dwrr-q high option
to schedule high priority traffic, the dwrr-q medium option to schedule medium priority traffic. and the
dwrr-q low option to schedule low priority traffic.
To associate a weight with a DWRR queue, follow these steps:
Command
Step 1
switch(config)# qos dwrr-q high weight 10
switch(config)# no qos dwrr-q low weight 51
Displaying Data Traffic Information
The show qos commands display the current QoS settings for data traffic (see Examples
Example 47-3 Displays the Contents of all Class Maps
switch# show qos class-map
qos class-map MyClass match-any
qos class-map Class2 match-all
qos class-map Class3 match-all
Example 47-4 Displays the Contents of a Specified Class Map
switch# show qos class-map name MyClass
qos class-map MyClass match-any
Example 47-5 Displays All Configured Policy Maps
switch# show qos policy-map
qos policy-map MyPolicy
qos policy-map Policy1
Cisco MDS 9000 Family Configuration Guide
47-10
match destination-wwn 20:01:00:05:30:00:28:df
match source-wwn 23:15:00:05:30:00:2a:1f
match input-interface fc2/1
match input-interface fc2/14
match source-wwn 20:01:00:05:30:00:2a:1f
match destination-wwn 20:01:00:05:30:00:28:df
match source-wwn 23:15:00:05:30:00:2a:1f
match input-interface fc2/1
class MyClass
priority medium
class Class2
priority low
Chapter 47
Configuring Fabric Congestion Control and QoS
Purpose
Associates a relative weight (10) to a specified
queue (default queue).
Restores the default weight of 20.
OL-6973-03, Cisco MDS SAN-OS Release 2.x
47-3
to 47-11).
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