CCNA Complete Guide 2nd Edition.pdf - Cisco Learning Home
CCNA Complete Guide 2nd Edition.pdf - Cisco Learning Home
CCNA Complete Guide 2nd Edition.pdf - Cisco Learning Home
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<strong>Cisco</strong> Wireless LAN Configuration<br />
- A wireless interface is just another interface on a router. However, enabling the wireless interface<br />
requires more configurations than enabling a FastEthernet interface. Unlike access points, the<br />
interface on the following router is a routed interface, which is the reason why the IP address is<br />
configured under the physical interface. Normally the IP address is configured under the<br />
management VLAN or Bridge Virtual Interface (BVI) on access points.<br />
Router(config)#int dot11radio0/3/0<br />
Router(config-if)#desc *** 1stFloor WLAN ***<br />
Router(config-if)#ip add 10.10.10.1 255.255.255.0<br />
Router(config-if)#no shut<br />
Router(config-if)#ssid 1stFloor-WLAN<br />
Router(config-if-ssid)#guest-mode [1]<br />
Router(config-if-ssid)#authentication open [2]<br />
Router(config-if-ssid)#infrastructure-ssid [3]<br />
Router(config-if-ssid)#no shut<br />
[1] .– .The guest-mode SSID subcommand configures the radio interface to broadcast the SSID.<br />
[2] – Open authentication allows wireless clients to join the open access wireless network (eg:<br />
hot spots) by only knowing its SSID. Additionally, the authentication shared SSID<br />
subcommand configures an access point for shared-key authentication.<br />
[3] – .The infrastructure-ssid SSID subcommand designates a SSID as an infrastructure SSID,<br />
which allows an access point to communicate to other access points, or other devices on<br />
the wired network. Repeater access points and non-root bridges use the specified SSID to<br />
associate with root access points and root bridges respectively (infrastructure associations).<br />
- In Infrastructure mode, all wireless clients communicate with each other through an access<br />
point instead of direct communication; whereas in Ad hoc mode, wireless clients communicate<br />
directly with each other without using an access point.<br />
- Below shows the configuration on a <strong>Cisco</strong> Aironet access point. Note that the IP address is<br />
configured under the Bridge Virtual Interface (BVI) instead of the Dot11radio interface, as the<br />
interface is not a routed interface as in the previous example. Additionally, the IP address is used<br />
for management only and does not affect the operation of the access point nor the WLAN.<br />
<strong>Cisco</strong>AP(config)#int dot11Radio0<br />
<strong>Cisco</strong>AP(config-if)#desc *** <strong>2nd</strong>Floor WLAN ***<br />
<strong>Cisco</strong>AP(config-if)#no shut<br />
<strong>Cisco</strong>AP(config-if)#ssid <strong>2nd</strong>Floor-WLAN<br />
<strong>Cisco</strong>AP(config-if-ssid)#guest-mode<br />
<strong>Cisco</strong>AP(config-if-ssid)#authentication open<br />
<strong>Cisco</strong>AP(config-if-ssid)#infrastructure-ssid<br />
<strong>Cisco</strong>AP(config-if-ssid)#no shut<br />
<strong>Cisco</strong>AP(config-if-ssid)#exit<br />
<strong>Cisco</strong>AP(config)#int bvi1<br />
<strong>Cisco</strong>AP(config-if)#ip add 11.11.11.1 255.255.255.0<br />
<strong>Cisco</strong>AP(config-if)#no shut<br />
186<br />
Copyright © 2008 Yap Chin Hoong<br />
yapchinhoong@hotmail.com
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