3Com 4210 PWR Configuration Manual page 310

308 C 28: Q S C
HAPTER O
Configuring to Trust the
802.1p Precedence of
the Received Packets
Configuring Priority
Trust Mode
ONFIGURATION
You can configure the switch to trust the 802.1p precedence of the received
packets. In this case, the priority of the receiving port is not used as the 802.1p
precedence of the received packet.
Configuration prerequisites
To trust the 802.1p precedence of the received packets is determined.
Configuration procedure
Table 228 Configure to trust the 802.1p precedence of the received packets
Operation
Enter system view
Configure to trust the
802.1p precedence of the
received packets
Configuration example
# Configure the switch to trust the 802.1p precedence of the received packets.
<4210> system-view
[4210] priority trust
Refer to section 1.2.3 "Priority Trust Mode" for introduction to priority trust
mode.
Configuration prerequisites
The priority trust mode to be adopted is determined.
Configuration procedure
Table 229 Configure the priority trust mode
Operation
Enter system view
Configure the priority
trust mode
Configuration example
# Configure the switch to trust the DSCP precedence of the received packets.
<4210> system-view
[4210] priority-trust dscp
Command Description
system-view -
priority trust Required
By default, for a packet with an 802.1q tag
header, the priority of the receiving port is
used as the 802.1p precedence of the
received packets.
Command Description
system-view -
priority-trust { cos | Required
dscp | ip-precedence }
By default, the switch trusts the 802.1p
precedence of the received packets. In this
case, the switch obtains the local
precedence by looking up the 802.1p
precedence in the
802.1p-precedence-to-local-precedence
mapping table and then assigns the local
precedence to the packet.