Cisco AIR-LAP1042N-E-K9 Manuale introduttivo - Pagina 7

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Access points must be discovered by a controller before they can become an active part of the network.

The 1040 series access point supports these controller discovery processes:

• Layer 3 CAPWAP discovery—Can occur on different subnets than the access point and uses IP

addresses and UDP packets rather than MAC addresses used by Layer 2 discovery.

• Locally stored controller IP address discovery—If the access point was previously joined to a

controller, the IP addresses of the primary, secondary, and tertiary controllers are stored in the

access point's non-volatile memory. This process of storing controller IP addresses on an access

point for later deployment is called priming the access point. For more information about priming,

see the "Performing a Pre-Installation Configuration" section on page 8.

• DHCP server discovery—This feature uses DHCP option 43 to provide controller IP addresses to

the access points. Cisco switches support a DHCP server option that is typically used for this

capability. For more information about DHCP option 43, see the "Configuring DHCP Option 43

and DHCP Option 60" section on page 32.

• DNS discovery—The access point can discover controllers through your domain name server

(DNS). For the access point to do so, you must configure your DNS to return controller IP

addresses in response to CISCO-LWAPP-CONTROLLER.localdomain, where localdomain is the

access point domain name. Configuring the CISCO-LWAPP-CONTROLLER provides backwards

compatibility in an existing customer deployment. When an access point receives an IP address

and DNS information from a DHCP server, it contacts the DNS to resolve

CISCO-LWAPP-CONTROLLER.localdomain. When the DNS sends a list of controller IP

addresses, the access point sends discovery requests to the controllers.

Preparing the Access Point

Before you mount and deploy your access point, we recommend that you perform a site survey (or use

the site planning tool) to determine the best location to install your access point.

You should have the following information about your wireless network available:

• Access point locations.

• Access point mounting options: below a suspended ceiling, on a flat horizontal surface, or on a

desktop.

You can mount the access point above a suspended ceiling but you must purchase

Note

additional mounting hardware: See "Mounting the Access Point" section on page 14 for

additional information.

• Access point power options: power supplied by the recommended external power supply (Cisco

AIR-PWR-B), a DC power supply, PoE from a network device, or a PoE power injector/hub

(usually located in a wiring closet).