User's Manual

Menus and Parameters
Manual Revision 1.0
4-69
VLAN Traffic Priority
Each packet to be transmitted to the wireless link is transferred to one
of three queues: Low, Mid and High. Packets in the High queue have the
highest priority for transmission, and those in the Low queue have the
lowest priority.
BreezeACCESS Subscriber and Access units support layer-2 traffic
prioritization according to the IEEE 802.1p standard. The priority field
in the 802.1Q header tag can have a value in the range 0 to 7. This
value determines the relative priority of the packet.
Packets received from the Ethernet port that have a priority higher than
the value of the VLAN Priority Threshold are routed to the Mid queue.
Since the system also supports layer 3 prioritization, based on ToS,
packets with precedence in the ToS field higher than the value of the
ToS Precedence Threshold parameter are also routed to the Mid queue.
This is applicable to both tagged and untagged frames.
All other packets received from the Ethernet port are routed to the Low
queue.
Control and wireless management frames generated in the unit are
routed to the High queue.
Any frame coming from the Ethernet port, which is meant to reach
another BreezeACCESS unit via the wireless port (as opposed to
messages intended for stations behind other BreezeACCESS units), is
sent to the High queue, regardless of the priority configuration.
NOTE
The prioritization mechanism is disabled when the traffic rate reaches the maximum
information rate supported by the SU.
The VLAN Traffic Priority menu includes the following parameters:
! VLAN Priority – Data (SU only)
! VLAN Priority – Management
! VLAN Priority Threshold
VLAN Priority - Data (SU only)
The VLAN Priority - Data is applicable for Access Links only. It enables
configuring the value of the VLAN Priority field for data frames
transmitted to the wireless link. All data frames are routed to the Low
queue. This parameter only impacts the way that other VLAN aware
devices handle the packet.