【答题赢鸿鹄币】WLC

小乔

QUESTION 129
What does the LAP send when multiple WLCs respond to the CISCO_CAPWAP-CONTROLLER.localdomain hostname during the CAPWAP discovery and join
process?
A. broadcast discover request
B. join request to all the WLCs
C. unicast discovery request to each WLC
D. Unicast discovery request to the first WLC that resolves the domain name

选详细解释给予20鸿鹄币奖励

vincente

The LAPs always connect to the management interface address of the controller first with a discovery request. The controller then tells the LAP the Layer 3 AP-manager interface (which can also be the management by default)IP address so the LAP can send a join request to the AP-manager interface next.

The AP goes through this process on startup:

    1. The LAP boots and DHCPs an IP address if it was not previously assigned a static IP address.

    2. The LAP sends discovery requests to controllers through the various discovery algorithms and builds a controller list. Essentially, the LAP learns as many management interface addresses for the controller list as possible via:

        a. DHCP option 43 (good for global companies where offices and controllers are on different continents)

        b. DNS entry for cisco-capwap-controller (good for local businesses - can also be used to find where brand new APs join)

        Note: If you use CAPWAP, make sure that there is a DNS entry for cisco-capwap-controller.

        c. Management IP addresses of controllers the LAP remembers previously

        d. A Layer 3 broadcast on the subnet

        e. Statically configured information
        
        f. Controllers present in the mobility group of the WLC the AP last joined