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DSCP is backward compatible with the three precedence bits in the ToS octet so
that non-DiffServ compliant, ToS-enabled network device will not conflict with the
DSCP mapping.
The DSCP value determines the forwarding behavior, the PHB (Per-Hop Behavior),
that each packet gets across the DiffServ network. Based on the marking rule,
different kinds of traffic can be marked for different priorities of forwarding.
Resources can then be allocated according to the DSCP values and the configured
policies.
8.3.4.3 ToS (Type of Service) and WMM QoS
The DSCP value of outgoing packets is between 0 and 255. 0 is the default
priority. WMM QoS checks the DSCP value in the header of data packets. It gives
the traffic a priority according to this number.
In order to control which priority level is given to traffic, the device sending the
traffic must set the DSCP value in the header. If the DSCP value is not specified,
then the traffic is treated as best-effort. This means the wireless clients and the
devices with which they are communicating must both set the DSCP value in order
to make the best use of WMM QoS. A Voice over IP (VoIP) device for example may
allow you to define the DSCP value.
The following table lists which WMM QoS priority level the NWA uses for specific
DSCP values.
8.3.5 Spanning Tree Protocol (STP)
STP detects and breaks network loops and provides backup links between
switches, bridges or routers. It allows a bridge to interact with other STP-
compliant bridges in your network to ensure that only one route exists between
any two stations on the network.
8.3.5.1 Rapid STP
The NWA uses IEEE 802.1w RSTP (Rapid Spanning Tree Protocol) that allow faster
convergence of the spanning tree (while also being backwards compatible with
Table 28
ToS and IEEE 802.1d to WMM QoS Priority Level Mapping
DSCP VALUE
WMM QOS PRIORITY LEVEL
224, 192
voice
160, 128
video
96, 0
A
A. The NWA also uses best effort for any DSCP value for which another WMM
QoS priority is not specified (255, 158 or 37 for example).
besteffort
64, 32
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Содержание NWA-3166
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Страница 15: ...15 PART I Introduction Introduction 17 The Web Configurator 29 Tutorials 33 ...
Страница 16: ...16 ...
Страница 32: ...Chapter 2 The Web Configurator NWA 3166 User s Guide 32 ...
Страница 64: ...Chapter 3 Tutorials NWA 3166 User s Guide 64 ...
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Страница 70: ...Chapter 4 Status Screen NWA 3166 User s Guide 70 ...
Страница 122: ...Chapter 8 Wireless Screen NWA 3166 User s Guide 122 ...
Страница 128: ...Chapter 9 SSID Screen NWA 3166 User s Guide 128 ...
Страница 158: ...Chapter 14 IP Screen NWA 3166 User s Guide 158 ...
Страница 166: ...Chapter 15 Rogue AP Detection NWA 3166 User s Guide 166 ...
Страница 186: ...Chapter 17 Internal RADIUS Server NWA 3166 User s Guide 186 ...
Страница 213: ...Chapter 19 Log Screens NWA 3166 User s Guide 213 ...
Страница 214: ...Chapter 19 Log Screens NWA 3166 User s Guide 214 ...
Страница 235: ...Chapter 20 VLAN NWA 3166 User s Guide 235 ...
Страница 236: ...Chapter 20 VLAN NWA 3166 User s Guide 236 ...
Страница 270: ...Appendix B Wireless LANs NWA 3166 User s Guide 270 ...
Страница 300: ...Appendix D IP Addresses and Subnetting NWA 3166 User s Guide 300 ...
Страница 308: ...Appendix E Text File Based Auto Configuration NWA 3166 User s Guide 308 ...
Страница 314: ...Appendix F How to Access and Use the CLI NWA 3166 User s Guide 314 ...
Страница 326: ...Appendix H Customer Support NWA 3166 User s Guide 326 ...
Страница 332: ...Index NWA 3166 User s Guide 332 ...