H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 683)

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Configuring the priority trust mode of a port
Priority mapping overview
When a packet enters a device, the device assigns a set of QoS priority parameters to the packet based
on a certain priority field carried in the packet and sometimes might modify its priority, according to
certain rules depending on device status. This process is called "priority mapping". The set of QoS
priority parameters decides the scheduling priority and forwarding priority of the packet.
The device provides various types of priority mapping tables, or rather, priority mappings. By looking up
a priority mapping table, the device decides which priority value is to assign to a packet for subsequent
packet processing.
You can configure priority mapping by configuring trusting packet priority or trusting port priority.
• If packet priority is trusted, the device uses the specified priority field of the incoming packet to look
up the priority mapping tables for the set of QoS priority parameters to assign to the packet. Note
that, if a received packet does not carry the specified priority field, the device uses the port priority
to look up the priority mapping tables for the set of QoS priority parameters to assign to the packet.
• If port priority is trusted, the device uses the port priority rather than packet priority to look up the
priority mapping tables for the set of QoS priority parameters to assign to the packet.
Configuring priority mapping
Two methods are available for you to configure the priority trust mode on a port for priority mapping:
• By using the first method, you can configure a port to use the 802.1p or 802.11e priority carried in
received packets for priority mapping. This method is supported for the WLAN-ESS interface in
addition to other types of interface.
• By using the second method, more options are available. In addition, you can change port priority
(local precedence) of a port for priority mapping. This method is not supported on the WLAN-ESS
interface.
Configuring the trust mode
1. Select QoS > Trust Mode from the navigation tree.