ZyXEL Communications AX Series User Manual

Chapter 12 Quality of Service (QoS)
AX/DX/EX/PX Series User’s Guide
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are eight classes of services (ranging from zero to seven) in IP precedence. Zero is the lowest priority
level and seven is the highest.
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 98 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
12
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

ZyXEL Communications AX Series Specifications

General

Brand	ZyXEL Communications
Model	AX Series
Category	Network Router
Language	English