ZyXEL Communications P-660RU-T1 v3, User Manual, Page: 105 / 230

Chapter 11 Quality of Service (QoS)
P-660RU-Tx v3 User’s Guide
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11.3.3 Automatic Priority Queue Assignment
If you enable QoS on the ZyXEL Device, the ZyXEL Device can automatically base on the
IEEE 802.1p priority level, IP precedence and/or packet length to assign priority to traffic
which does not match a class.
The following table shows you the internal layer-2 and layer-3 QoS mapping on the ZyXEL
Device. On the ZyXEL Device, traffic assigned to higher priority queues gets through faster
while traffic in lower index queues is dropped if the network is congested.
Table 30 Internal Layer2 and Layer3 QoS Mapping
PRIORITY
QUEUE
LAYER 2 LAYER 3
IEEE 802.1P USER
PRIORITY
(ETHERNET
PRIORITY)
TOS (IP
PRECEDENCE)
DSCP
IP PACKET
LENGTH (BYTE)
0 1 0 000000
1 2
2 0 0 000000 >1100
3 3 1 001110
001100
001010
001000 250~1100
4 4 2 010110
010100
010010
010000
5 5 3 011110
011100
011010
011000 <250
6 6 4 100110
100100
100010
100000
5 101110
101000
7 7 6 110000
111000
7