G-3000H User’s Guide
Chapter 7 Multiple ESS, SSID and VLAN
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Multiple ESS, SSID and VLAN
This chapter describes how to use configure multiple ESS, SSID and VLAN on your ZyAIR.
7.1 Wireless LAN Infrastructures
See the Wizard Setup and Wireless LAN chapters for some basic WLAN scenarios and
terminology.
7.1.1 Multiple ESS
Traditionally, you needed different APs to configure different ESSs. As well as the cost of
buying extra APs, there was also the possibility of channel interference. The ZyAIR’s
Multiple ESS (Multi-ESS) function allows multiple ESSs to be configured on just one access
point (the ZyAIR).
Wireless stations can use different ESS IDs to associate with the same AP. Only wireless
stations with the same ESS ID can communicate with each other. This allows the AP to
logically group wireless stations in a manner similar to VLAN (Virtual LAN).
With Multi-ESS, the ZyAIR ignores the ToS in the header of data packets and uses a single
QoS priority level for all of an ESS’s traffic.
7.1.2 Notes on Multiple-ESS
• A maximum of eight ESSs are allowed on one AP.
• Each ESS has its own MAC filter set; see the MAC filter set section for more
information.
• When you enable Multi-ESS on the ZyAIR, you need to configure separate Unicast and
Multicast/Broadcast keys for each ESS. A Unicast transmission is from one sender to one
recipient. A broadcast transmission is from one sender to everybody on the network. A
Multicast transmission is from one sender to a group of hosts on the network.
• You must use different WEP keys for different ESSs. If two stations have different ESS
IDs (they are in different ESSs), but have the same WEP keys, they may hear each other’s
communications (but not communicate with each other).
• When you enable Multi-ESS, ESS IDs are automatically hidden (so site survey tools
cannot find other station ESS IDs).
• Multi-ESS should not replace but rather be used in conjunction with 802.1x security.
Summary of Contents for ZyAIR G-3000H
Page 1: ...G 3000H 802 11g Wireless Access Point User s Guide Version 3 50 1 2006 ...
Page 22: ...G 3000H User s Guide 22 List of Figures ...
Page 26: ...G 3000H User s Guide 26 List of Tables ...
Page 114: ...G 3000H User s Guide 114 Chapter 9 VLAN ...
Page 134: ...G 3000H User s Guide 134 Chapter 11 Certificates ...
Page 164: ...G 3000H User s Guide 164 Chapter 15 Introducing the SMT ...
Page 180: ...G 3000H User s Guide 180 Chapter 17 LAN Setup ...
Page 218: ...G 3000H User s Guide 218 Chapter 24 System Maintenance and Information ...
Page 224: ...G 3000H User s Guide 224 Appendix C Power over Ethernet PoE Specifications ...
Page 226: ...G 3000H User s Guide 226 Appendix D Brute Force Password Guessing Protection ...
Page 238: ...G 3000H User s Guide 238 Appendix E Setting up Your Computer s IP Address ...
Page 242: ...G 3000H User s Guide 242 Appendix F IP Address Assignment Conflicts ...
Page 254: ...G 3000H User s Guide 254 Appendix G Wireless LANs ...
Page 262: ...G 3000H User s Guide 262 Appendix H IP Subnetting ...
Page 264: ...G 3000H User s Guide 264 Appendix I Command Interpreter ...
Page 268: ...G 3000H User s Guide 268 Appendix J Log Descriptions ...
Page 272: ...G 3000H User s Guide 272 Appendix L Power Adaptor Specifications ...
Page 280: ...G 3000H User s Guide 280 Appendix M Text File Based Auto Configuration ...
Page 294: ...G 3000H User s Guide 294 Appendix N Wireless LAN Manager ...
Page 299: ...G 3000H User s Guide Index 299 ZyNOS F W Version 196 zyxel prowireless mib 287 ...