3Com Switch 7750 Configuration Guide

Configuring Priority Remark 669
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:
<SW7750> system-view
[SW7750] qos cos-local-precedence-map23417056
[SW7750] display qos cos-local-precedence-map
cos-local-precedence-map:
cos: 01234567
--------------------------------------------------------------------------
local-precedence : 2 3 4 1 7 0 5 6
Configuring Priority
Remark
Refer to “Priority Remark” on page 660 for the introduction to priority remark.
Priority remark can be implemented in the following ways:
■ Through TP (only non-type-A I/O Modules support this function). When
configuring TP, you can define the action of remarking the DSCP precedence
for the packets exceeding the traffic limit. Refer to “Configuration Procedure
of TP” on page 672.
Table 538 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