3Com Switch 7750 Configuration Guide Guide

624 CHAPTER 58: QOS CONFIGURATION
Configuration prerequisites
The priority to be used when a packet enter a queue is specified.
Configuration procedure
Configuration example
# Configure to use the DSCP precedence when a packet enters an output queue
<SW7750> system-view
[SW7750] priority-trust dscp
Configuring the
Mapping Relationship
between 802.1p Priority
Values and Queues
You can modify the mapping relationship between 802.1p priority values and local
precedence values to modify the mapping relationship between 802.1p priority
values and output queues.
Configuration prerequisites
The mapping relationship between 802.1p priority values and local precedence
values and the default mapping table are well known.
Configuration procedure
Configuration example
■ Configure the 802.1p-to-local-precedence as follows: 0 to 2, 1 to 3, 2 to 4, 3
to 1, 4 to 7, 5 to 0, 6 to 5 and 7 to 6.
■ Display the configuration.
Configuration procedure:
Tabl e 493 Configure the priority to be used when a packet enters a queue
Operation Command Description
Enter system view system-view -
Configure the priority to be
used when a packet enters an
output queue
priority-trust { dscp |
ip-precedence | cos |
local-precedence }
Required
By default, the local
precedence is used when a
packet enter an output queue
Tabl e 494 Configure the COS-to-local-precedence mapping table
Operation Command Description
Enter system view system-view -
Configure the
COS-to-local-precedence
mapping table
qos
cos-local-precedence-map
cos0-map-local-prec
cos1-map-local-prec
cos2-map-local-prec
cos3-map-local-prec
cos4-map-local-prec
cos5-map-local-prec
cos6-map-local-prec
cos7-map-local-prec
Optional
Display the mapping table
display qos
cos-local-precedence-map
You can execute the display
command in any view