Allied Telesis AT-S63 - Manual (Page 317)

AT-S63 Management Software Menus Interface User’s Guide
Section II: Advanced Operations 317
Configuring CoS
As explained in “Class of Service Overview” on page 312, a packet
received on a port is placed it into one of eight 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 11 on
page 313.
You can override the mappings at the port level by assigning the packets a
temporary priority level. Note that this assignment is made when a packet
is received 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
assigned a temporary priority level of 5, regardless of the actual priority
levels that might be in the frames themselves, as found in tagged frames.
A temporary priority level applies only while a frame traverses the
switching matrix. Tagged frames, which can contain a priority level, 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 7 to select Security and Services.
2. From the Security and Services menu, type 5 to select Class of
Service (CoS).
The Class of Service (CoS) menu is shown in Figure 98.
Figure 98. Class of Service (CoS) Menu
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Class of Service (CoS)
Number of CoS Queues: 8
1 - Configure Port CoS Priorities
2 - Map CoS Priority to Egress Queue
3 - Configure Egress Scheduling
4 - Show Port CoS Priorities
R - Return to Previous Menu
Enter your selection?