Cisco 1830 Series Посібник для початківців - Сторінка 19

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You cannot edit or query any access point using the controller CLI if the name of the access

Note

point contains a space.

Make sure that the controller is set to the current time. If the controller is set to a time that

Note

has already passed, the access point might not join the controller because its certificate may

not be valid for that time.

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

The 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

• 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

section on page

• 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.

26.

11.

"Configuring DHCP Option 43"