Allied-telesis AT-S80 Manual do Utilizador descarregar pdf (Página 298)

Chapter 31: Quality of Service (QoS)

298 Section II: Using the Web Browser Interface

Configuring CoS

As explained in “QoS Overview” on page 140, 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 141.

You can override the mappings at the port level by assigning a new default

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, regardless of the priority levels that might be in

the frames themselves, as found in tagged frames.

Note

The switch does not alter the original priority level in tagged frames.

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 bookmarks on the left side of the page, click on Bridge.

The Bridge folder expands to include the VLAN folder.

2. From the VLAN folder, select Default Port VLAN & CoS.

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Allied-telesis AT-S80 Manual do Utilizador Página 298