Cisco Cisco Aironet 702W Access Point Guía De Instalación

Make sure that the controller is set to the current time. If the controller is set to a time that has already occurred, the 
access point might not join the controller because its certificate may not be valid for that time.

Access points must discovered a controller before they can become an active part of the network. The access point supports 
these controller discovery processes:

Layer 3 CAPWAP discovery—The access point performs a local broadcast (255.255.255.255) discovery request to find any 
contollers on the same subnet/vlan. The request can be forwarded to other networks by the IP helper featuer that is present 
on switches and router.

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 

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 

.

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-CAPWAP-CONTROLLER.localdomain, where localdomain is the access point domain name. Configuring the 
CISCO-CAPWAP-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-CAPWAP-CONTROLLER.localdomain. When the DNS sends a list of controller IP addresses, the access point 
sends discovery requests to the controllers.

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 (Wall and Junction Box mounting only)

Access point power options: power supplied by the recommended external power supply (with power adapter 
AIR-PWR-C=), a DC power supply, PoE from a network device (802.3af/at), or a PoE power injector/hub (the 
Cisco-recommended injector is the AIR-PWRINJ4=), usually located in a wiring closet.

PoE-Out is available via LAN port 4

Cisco recommends that you make a site map showing access point locations so that you can record the device MAC addresses 
from each location and return them to the person who is planning or managing your wireless network.

802.3af / AIR-PWRINJ5

No power available for the PoE-out port

802.3at/AIR-PWRINJ4

Class 2, 6.49W (7W with cable losses)

AIR-PWR-C

Class 0, 12.95W (15.4W with cable losses)