Draytek VigorSwitch G2080, Руководство пользователя, Страница: 52 / 120

VigorSwitch G2080 User’s Guide 46
2
2
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5
5
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2
2
V
V
L
L
A
A
N
N
T
T
a
a
g
g
P
P
r
r
i
i
o
o
r
r
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Function name:
VLAN Tag Priority
Function description:
In vlan tag, there are 3 bits belonging to priority. According to these 3 bits, we could
arrange 8 traffics –0 0 0, 0 0 1, 0 1 0, 0 1 1, 1 0 0, 1 0 1, 1 1 0, 1 1 1. We can set High
priority or Low priority for each traffic class. For instance, if we let VLAN-tagged priority
0 0 0 be high priority and VLAN-tagged priority 0 0 1 be Low Priority, and then make port
1, 2, 3 be in the vlan 2. We sent the packets that have the value 0 0 0 in vlan-tagged field
and VID equals 2 from the port 2 and the packets that have the value 0 0 1 in vlan-tagged
field and VID equals 2 from the port 3 into the switch. We let the two kinds of packets be
transmitted for port 1 until the port results in congestion. The result is that the packets will
be dropped partially from the port 3 because the packets that belong to Low Priority. For
the use of VLAN Tag Priority function, please press
<Configure> button at the right
section for setting in advance.
Parameter description:
VLAN Tag Configuration: Used for setting up the QoS belongs to VLAN operation.
Port: User can set up the port (1~8) respectively to let VLAN Tag
QoS function work on them. If you would like to set up all
ports at a time, user is also allowed to choose “All” in the
selection list to simplify the procedure of configuration.
Bit 0, Bit 1, Bit 2: According to the arrangement of VLAN-tagged priority, it
can form 8 kinds of traffics, including 0 0 0, 0 0 1, 0 1 0, 0 1
1, 1 0 0, 1 0 1, 1 1 0
and 1 1 1.
Class: 8 kinds of traffic as mentioned above, user can set up High
Priority or Low Priority for each port respectively.