Chapter 14 Quality of Service (QoS)

these two classes are assigned priority queue based on the internal QoS mapping table on the ZyXEL Device.

Figure 83 QoS Example

VoIP: Queue 6

DSL

50 Mbps

Boss: Queue 5

IP=192.168.1.23

14.1.1What You Can Do in the QoS Screens

•Use the QoS screen (Section 14.2 on page 171) to configure QoS settings on the ZyXEL Device.

•Use the QoS Settings Summary screen (Section 14.2.1 on page 173) to check the summary of QoS rules and actions you configured for the ZyXEL Device.

14.1.2What You Need to Know About QoS

802.1p

QoS is used to prioritize source-to-destination traffic flows. All packets in the same flow are given the same priority. 802.1p is a way of managing traffic in a network by grouping similar types of traffic together and treating each type as a class. You can use 802.1p to give different priorities to different packet types.

Tagging and Marking

In a QoS class, you can configure whether to add or change the DiffServ Code Point (DSCP) value, IEEE 802.1p priority level and VLAN ID number in a matched packet. When the packet passes through a compatible network, the networking device, such as a backbone switch, can provide specific treatment or service based on the tag or marker.

Finding Out More

See Section 14.3 on page 174 for advanced technical information on QoS.

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P-660HN-T1H User’s Guide