Chapter 10 Quality of Service (QoS)
VSG1435-B101 Series User’s Guide
156
• The
Monitor
screen lets you view the ZyXEL Device's QoS-related packet
statistics (
Section 10.7 on page 169
).
10.2 What You Need to Know
The following terms and concepts may help as you read through this chapter.
QoS versus Cos
QoS is used to prioritize source-to-destination traffic flows. All packets in the same
flow are given the same priority. CoS (class of service) 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 DiffServ (Differentiated
Services 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 ToS (Type of Service) field in the IP header.
Tagging and Marking
In a QoS class, you can configure whether to add or change the DSCP (DiffServ
Code Point) 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.
Traffic Shaping
Bursty traffic may cause network congestion. Traffic shaping regulates packets to
be transmitted with a pre-configured data transmission rate using buffers (or
queues). Your ZyXEL Device uses the Token Bucket algorithm to allow a certain
amount of large bursts while keeping a limit at the average rate.
Tr
af
fi
c
Time
Traffic Rate
Tr
a
ff
ic
Time
Traffic Rate
(Before Traffic Shaping)
(After Traffic Shaping)
Содержание VSG1435-B101 - V1.10
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Страница 8: ...Safety Warnings VSG1435 B101 Series User s Guide 8 ...
Страница 10: ...Contents Overview VSG1435 B101 Series User s Guide 10 ...
Страница 20: ...Table of Contents VSG1435 B101 Series User s Guide 20 ...
Страница 21: ...21 PART I User s Guide ...
Страница 22: ...22 ...
Страница 42: ...Chapter 2 The Web Configurator VSG1435 B101 Series User s Guide 42 ...
Страница 71: ...71 PART II Technical Reference ...
Страница 72: ...72 ...
Страница 78: ...Chapter 5 Network Map and Status Screens VSG1435 B101 Series User s Guide 78 ...
Страница 150: ...Chapter 8 Home Networking VSG1435 B101 Series User s Guide 150 ...
Страница 154: ...Chapter 9 Static Routing VSG1435 B101 Series User s Guide 154 ...
Страница 178: ...Chapter 11 Policy Forwarding VSG1435 B101 Series User s Guide 178 ...
Страница 196: ...Chapter 12 Network Address Translation NAT VSG1435 B101 Series User s Guide 196 ...
Страница 202: ...Chapter 13 Dynamic DNS Setup VSG1435 B101 Series User s Guide 202 ...
Страница 228: ...Chapter 16 Firewall VSG1435 B101 Series User s Guide 228 ...
Страница 234: ...Chapter 18 Parental Control VSG1435 B101 Series User s Guide 234 ...
Страница 282: ...Chapter 25 Traffic Status VSG1435 B101 Series User s Guide 282 ...
Страница 286: ...Chapter 26 IGMP Status VSG1435 B101 Series User s Guide 286 ...
Страница 294: ...Chapter 28 Remote Management VSG1435 B101 Series User s Guide 294 ...
Страница 298: ...Chapter 29 Time Settings VSG1435 B101 Series User s Guide 298 ...
Страница 302: ...Chapter 30 Logs Setting VSG1435 B101 Series User s Guide 302 ...
Страница 318: ...Chapter 34 Troubleshooting VSG1435 B101 Series User s Guide 318 ...
Страница 348: ...Appendix A Setting up Your Computer s IP Address VSG1435 B101 Series User s Guide 348 ...
Страница 358: ...Appendix B IP Addresses and Subnetting VSG1435 B101 Series User s Guide 358 ...
Страница 368: ...Appendix C Pop up Windows JavaScripts and Java Permissions VSG1435 B101 Series User s Guide 368 ...
Страница 384: ...Appendix D Wireless LANs VSG1435 B101 Series User s Guide 384 ...
Страница 412: ...Index VSG1435 B101 Series User s Guide 412 ...