ZyXEL P-792H v2 User Guide - Page 202
What You Can Do in the QoS Screens, What You Need to Know About QoS
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Chapter 15 Quality of Service (QoS) 1 First, you have to configure WAN connection(s) in Network > WAN > Internet Access Setup and Network > WAN > More Connections. Click the Advanced Setup button on the corresponding PVC setting screens to configure ATM QoS, if you want to prioritize traffic and eliminate congestion over the ATM network (at the ATM layer). 2 Configure queue settings in Advanced > QoS > Queue Setup according to the priority you want to apply to different types of traffic. 3 Configure class settings in Advanced > QoS > Class Setup. This associates queues with PVCs by mapping the priority of queues to the index number of PVCs. 15.2.1 What You Can Do in the QoS Screens • Use the General screen (Section 15.3 on page 207) to enable QoS on the P792H v2, decide allowable bandwidth using QoS and configure priority mapping settings for traffic that does not match a custom class. • Use the Class Setup screen (Section 15.4 on page 208) to set up classifiers to sort traffic into different flows and assign priority and define actions to be performed for a classified traffic flow. • Use the Monitor screen (Section 15.5 on page 214) to view the P-792H v2's QoS-related packet statistics. 15.2.2 What You Need to Know About QoS QoS versus Cos QoS is used to prioritize source-to-destination traffic flows. All packets in the same flow are given the same priority. Class of Service (CoS) 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 CoS to give different priorities to different packet types. 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 eight-bit Type of Service (ToS) field in the IP header. 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. 202 P-792H v2 User's Guide