Cisco 1242AG - Aironet - Wireless Access Point Hardware Installation Manual page 110

Before deploying your lightweight access points to their final locations, follow these steps to prime your
access points:
In a Layer 2 environment, where the lightweight access points are located on the same subnet as the
Step 1
controller, the access point communicates directly with the controller.
In a Layer 3 environment, ensure a DHCP server (typically on your switch) is enabled on the same subnet
Step 2
as your lightweight access points. The access points will receive its IP address and controller information
using DHCP Option 43.
The lightweight access point must be able to find the IP address of the controller. This can be
accomplished using DHCP, DNS, OTAP, or IP subnet broadcast. This guide describes the DHCP method
to convey the controller IP address. For more information, refer to the
for Lightweight Access Points" section on page
Note
Ensure that your controller is connected to a switch trunk port.
Step 3
Configure the controller in LWAPP Layer 3 mode and ensure that its DS Port is connected to the switch.
Step 4
Use the CLI, web-browser interface, or Cisco WCS procedures as described in the appropriate controller
guide.
In multi-controller environments, You can set one controller's DS port to Master (you can use the
a.
config network master-base disable CLI command or you can use the controller GUI) so that new
access points always associate with it. You can use the show network config CLI command to
determine if the controller DS port is the master.
All access points associate to the master controller. From one location, you can configure access
point settings, such as primary, secondary, and tertiary controllers. This allows you to redistribute
your access points to other controllers on the network.
You can also use a Cisco WCS server to control, configure, and redistribute all your access points
from a single location.
Step 5 Apply power to the lightweight access points:
a. Connect your lightweight access points to untagged access ports on your POE capable switch. You
can optionally use power modules or power injectors to power your access points.
b. After you power up the lightweight access point, it begins a power-up sequence that you can check
by observing the access point LEDs. All LEDs blink sequentially back and forth, indicating that the
access point is trying to find a controller.
Note
If the lightweight access point shuts down (all LEDs off), check to ensure that sufficient power is
c.
available.
Cisco Aironet 1240AG Series Access Point Hardware Installation Guide
F-2
For a Layer 3 access point on a different subnet than the controller, ensure ensure the route to
the controller has destination UDP ports 12222 and 12223 open for LWAPP communications.
Ensure that the routes to the primary, secondary, and tertiary controllers allow IP packet
fragments.
If the lightweight access point remains in this mode for more than 5 minutes, the access point is
unable to find the master controller. Check the connection between the access point and the
controller and ensure they are on the same subnet.
Appendix F Priming Lightweight Access Points Prior to Deployment
"Configuring DHCP Option 43
G-1.
OL-8371-05