Chapter 15 Quality of Service (QoS)
CoS technologies include IEEE 802.1p layer 2 tagging and Differentiated Services (DiffServ or DS). IEEE 802.1p tagging makes use of three bits in the packet header, while DiffServ is a new protocol and defines a new DS field, which replaces the
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 15.5 on page 237 for advanced technical information on QoS.
15.1.3 QoS Class Setup ExampleIn the following figure, your Internet connection has an upstream transmission speed of 50 Mbps. You configure a classifier to assign the highest priority queue (6) to VoIP traffic from the LAN interface, so that voice traffic would not get delayed when there is network congestion. Traffic from the boss’s IP address (192.168.1.23 for example) is mapped to queue
5.Traffic that does not match these two classes are assigned priority queue based on the internal QoS mapping table on the ZyXEL Device.
Figure 133 QoS Example
VoIP: Queue 6
DSL
50 Mbps
Boss: Queue 5
IP=192.168.1.23
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