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Chapter 10 Quality of Service (QoS)
VMG4380-B10A / VMG4325-B10A User’s Guide
162
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 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
af
fi
c
Time
Traffic Rate
(Before Traffic Shaping)
(After Traffic Shaping)
Содержание VMG4325-B10A
Страница 4: ...Contents Overview VMG4380 B10A VMG4325 B10A User s Guide 4 Troubleshooting 283 ...
Страница 14: ...Table of Contents VMG4380 B10A VMG4325 B10A User s Guide 14 ...
Страница 15: ...15 PART I User s Guide ...
Страница 16: ...16 ...
Страница 24: ...Chapter 1 Introducing the Device VMG4380 B10A VMG4325 B10A User s Guide 24 ...
Страница 37: ...Chapter 4 Tutorials VMG4380 B10A VMG4325 B10A User s Guide 37 7 Click Apply to save your settings ...
Страница 69: ...69 PART II Technical Reference ...
Страница 70: ...70 ...
Страница 178: ...Chapter 10 Quality of Service QoS VMG4380 B10A VMG4325 B10A User s Guide 178 ...
Страница 204: ...Chapter 13 Interface Group VMG4380 B10A VMG4325 B10A User s Guide 204 ...
Страница 220: ...Chapter 15 Firewall VMG4380 B10A VMG4325 B10A User s Guide 220 ...
Страница 226: ...Chapter 17 Parental Control VMG4380 B10A VMG4325 B10A User s Guide 226 ...
Страница 236: ...Chapter 19 Certificates VMG4380 B10A VMG4325 B10A User s Guide 236 ...
Страница 240: ...Chapter 20 Log VMG4380 B10A VMG4325 B10A User s Guide 240 ...
Страница 244: ...Chapter 21 Traffic Status VMG4380 B10A VMG4325 B10A User s Guide 244 ...
Страница 250: ...Chapter 24 IGMP Status VMG4380 B10A VMG4325 B10A User s Guide 250 ...
Страница 254: ...Chapter 25 xDSL Statistics VMG4380 B10A VMG4325 B10A User s Guide 254 ...
Страница 256: ...Chapter 26 User Account VMG4380 B10A VMG4325 B10A User s Guide 256 ...
Страница 262: ...Chapter 29 TR 064 VMG4380 B10A VMG4325 B10A User s Guide 262 ...
Страница 266: ...Chapter 30 Time Settings VMG4380 B10A VMG4325 B10A User s Guide 266 ...
Страница 272: ...Chapter 32 Logs Setting VMG4380 B10A VMG4325 B10A User s Guide 272 ...
Страница 290: ...Chapter 36 Troubleshooting VMG4380 B10A VMG4325 B10A User s Guide 290 ...
Страница 330: ...Appendix C Pop up Windows JavaScripts and Java Permissions VMG4380 B10A VMG4325 B10A User s Guide 330 ...
Страница 344: ...Appendix D Wireless LANs VMG4380 B10A VMG4325 B10A User s Guide 344 ...