Allied Telesis AT-S79 - Manual (Page 150)

Chapter 12: Quality of Service (QoS)
150 Section I: Using the Menus Interface
Configuring CoS
As explained in “QoS Overview” on page 144, a packet received on a port
is placed it into one of four priority queues on the egress port according to
the switch’s mapping of 802.1p priority levels to egress priority queues.
The default mappings are shown in Table 2 on page 145.
You can override the mappings at the port level by assigning a different
egress queue to a port. Note that this assignment is made on the ingress
port and before the frame is forwarded to the egress port. Consequently,
you need to configure this feature on the ingress port. For example, you
can configure a switch port so that all ingress frames are stored in egress
queue 3 of the egress port.
Note
The switch does not alter the original priority level in tagged frames.
As a result, the frames leave the switch with the same priority level
they had when they entered the switch.
To configure CoS for a port, perform the following procedure:
1. From the Main Menu, type A to select Advanced Switch
Configuration.
The Advanced Switch Configuration Menu is shown in Figure 16 on
page 70.
2. From the Advanced Switch Configuration Menu, type S to select
Quality of Service Configuration.
The Quality of Service Configuration Menu is shown in Figure 33 on
page 147.
3. From the Quality of Service Configuration Menu, type P to select Port
Priority Configuration.