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72 Chapter 2 Network configuration
212859-A
The newly tagged frame is read within the switch and sent to the port’s high or
low transmit queue for disposition. The port transmit queue example shown in
Figure 27 applies to all ports in the BayStack 380 switch.
Figure 27 Port Transmit Queue
As shown in Figure 27, the switch provides four transmission queues, Highest,
High, Low, and Lowest for any given port. Frames are assigned to one of these
queues on the basis of the user_priority value, using a traffic class table. This
table is managed by using the Traffic Class Configuration screen. The table
indicates the traffic class assigned to the frame for each user_priority value. If the
frame leaves the switch formatted as a tagged packet, the traffic class assigned to
the frame is carried forward to the next 802.1p-capable switch. This allows the
packet to carry the assigned traffic class priority through the network until it
reaches its destination.
The following steps show how to use the Traffic Class Configuration screen to
configure the port priority level.
User priority
(7)
Port
transmit
queue
Traffic
class
High priority
packet
7
6
5
4
3
2
1
0
Highest
High
Low
Lowest