H3C S5120-SI Series

3-6
Configuring the Trusted Precedence Type for a Port
You can configure whether to trust the priority of packets. On a device supporting port trusted
precedence type, the priority mapping process for packets is shown in
Priority Mapping Overview.
You can configure one of the following trusted precedence types for a port:
z dot1p: Trusts the 802.1p precedence of the received packets and uses the 802.1p precedence for
mapping.
z dscp: Trusts the DSCP values of the received IP packets and uses the DSCP values for mapping.
Configuration Prerequisites
z It is determined to trust port priority.
z The trusted precedence type for the port is determined.
z The priority mapping table corresponding to the trusted precedence type is configured. For the
detailed configuration procedure, refer to
Configuring a Priority Mapping Table.
Configuration Procedure
Follow these steps to configure the trusted precedence type:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter
interface
view
interface interface-type
interface-number
Enter
interface
view or port
group view
Enter port
group view
port-group manual
port-group-name
Use either command
Settings in interface view take
effect on the current interface;
settings in port group view take
effect on all ports in the port
group..
Configure the trusted
precedence type
qos trust { dot1p | dscp }
Required
By default, port priority is
trusted.
Display the trusted
precedence type
configuration
display qos trust interface
[ interface-type interface-number ]
Optional
Available in any view
Configuration Example
Network requirements
Configure port GigabitEthernet 1/0/1 to trust the 802.1p precedence of received packets.
Configuration procedure
# Enter system view.
<Sysname> system-view
# Enter port view.