Chapter 10 Quality of Service (QoS)

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 39 Internal Layer2 and Layer3 QoS Mapping

 

LAYER 2

LAYER 3

 

 

PRIORITY

IEEE 802.1P

TOS (IP

 

IP PACKET

QUEUE

USER PRIORITY

DSCP

 

(ETHERNET

PRECEDENCE)

LENGTH (BYTE)

 

PRIORITY)

 

 

 

0

1

0

000000

 

 

 

 

 

 

1

2

 

 

 

 

 

 

 

 

2

0

0

000000

>1100

 

 

 

 

 

3

3

1

001110

250~1100

 

 

 

001100

 

 

 

 

001010

 

 

 

 

001000

 

 

 

 

 

 

4

4

2

010110

 

 

 

 

010100

 

 

 

 

010010

 

 

 

 

010000

 

 

 

 

 

 

5

5

3

011110

<250

 

 

 

011100

 

 

 

 

011010

 

 

 

 

011000

 

 

 

 

 

 

6

6

4

100110

 

 

 

 

100100

 

 

 

 

100010

 

 

 

 

100000

 

 

 

 

 

 

 

 

5

101110

 

 

 

 

101000

 

 

 

 

 

 

7

7

6

110000

 

 

 

 

 

 

 

 

7

111000

 

 

 

 

 

 

172

 

VSG1435-B101 Series User’s Guide