Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 494)

DSCP trust mode classifies packets based on the incoming DSCP value. If the incoming packet is
priority tagged, fallback is to classify packets based on the CoS value.
switch(conf-if-te-1/1/2)# qos trust dscp
5. Return to privileged EXEC mode.
switch(conf-if-te-1/1/2)# end
6. Enter the copy command to save the running-config file to the startup-config file.
switch# copy running-config startup-config
Verifying a DSCP-to-CoS mutation map
To verify applied DSCP-to-CoS maps, you can use one or both of the following options from global
configuration mode.
• Verify DSCP mapping for a specific map using the do show qos maps dscp-cos command and
the map name.
switch(config)# do show qos maps dscp-cos test
• Verify all DSCP mapping by using the do show qos maps command with the dscp-cos operand
only.
switch(config)# do show qos maps dscp-cos
• Verify DSCP-to-CoS mutation mapping for an interface by using the show qos interface command
and specifying the interface:
switch(config)# do show qos interface te 1/1/2
Configuring traffic class mapping for flexibility
Where additional flexibility in queue selection is required, refer to Configuring traffic class mapping on
page 494.
Configuring traffic class mapping
The Brocade switch supports eight unicast traffic classes to provide isolation and to control servicing
for different priorities of application data. Traffic classes are numbered from 0 through 7, with higher
values designating higher priorities.
NOTE
For information on user priority mapping, refer to
User-priority mapping on page 472.
The traffic class mapping stage provides some flexibility in queue selection:
• The mapping may be many-to-one, such as mapping one-byte user priority (256 values) to eight
traffic classes.
• There may be a nonlinear ordering between the user priorities and traffic classes.
Understanding unicast and multicast traffic defaults
The following table displays the Layer 2 default traffic unicast class mapping supported for a CoS-
based user priority to conform to .
Verifying a DSCP-to-CoS mutation map
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