3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring Port Priority 855
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■ With port priority trust mode configured and the port priority value configured
for the port, the switch looks up the 802.1p-precedence-to-local-precedence
priority mapping table based on the port priority to assign local precedence to
the packets, no matter whether a packet is tagged with a VLAN tag or not.
■ POS interfaces do not support port priority trust configuration.
Configuration Examples Network requirements
■ All departments in the enterprise network are interconnected through Switch.
The network creates different VLANs for different departments.
■ It is required that Switch assign local precedence values to packets through
priority mapping on the incoming port.
■ The default priority mapping tables of Switch are adopted in priority mapping.
Network diagram
Figure 252 Network diagram for priority trust mode configuration
Configuration procedure
# Enter system view.
<Sysname> system-view
To do... Use the command... Remarks
Enter system view system-view -
Enter
Ethernet
interface
view or
port group
view
Enter
Ethernet
interface
view
interface interface-type
interface-number
Use either the command
Configured in Ethernet interface
view, the setting is effective on
the current interface only;
configured in port group view,
the setting is effective on all the
ports in the port group.
Enter port
group view
port-group { manual
port-group-name | aggregation
agg-id }
Configure port priority qos priority priority-value Optional
0 by default