Allied-telesis AT-S86 Manual de usuario descargar pdf (Pagina 81)

AT-S86 Management Software User’s Guide

and the four egress queues of a switch port.

For example, if a tagged packet with a priority level of 3 entered a port on

the switch, the switch would store the packet in Q2 queue on the egress

port.

Note that priority 0 is mapped to CoS queue 2 instead of CoS queue 1

because tagged traffic that has never been prioritized has a VLAN tag

User Priority of 1. If priority 0 was mapped to CoS queue 1, this default

traffic goes to the lowest queue, which is probably undesirable. This

mapping also makes it possible to give some traffic a lower priority than

the default traffic.

You can change these mappings. For example, you might decide that

packets with a priority of 5 need to be handled by egress queue Q3 and

packets with a priority of 2 should be handled in Q1. The result is shown in

Table 2.

Table 1. Default Mappings of IEEE 802.1p Priority Levels to Priority

Queues

IEEE 802.1p Priority

Level

Port Priority Queue

0Q2

1Q1

2Q1

3Q2

4Q3

5Q3

6Q4

7Q4

Table 2. Customized Mappings of IEEE 802.1p Priority Levels to Priority

Queues

IEEE 802.1p Priority

Level

Port Priority Queue

0Q2

1Q1

2Q1

3Q3

4Q3

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 147 148

Sin comentarios

Allied-telesis AT-S86 Manual de usuario Pagina 81