I had this case a couple of times and thought it might be useful for all of us... you know that the AP, upon booting, will try hard to discover a controller, using broadcast, pre-configuration (AP priming as they say) DHCP option 43, DNS, OTAP, etc.
Now my friend has an AP at home, and wants to use it to connect to its corporate network over his VPN link (my friend's router to the company VPN concentrator).
The AP is new, so there is no controller IP address the AP could remember from a previous life (AP priming).
There is no other AP around, so forget about OTAP.
My friend's network is small, so no option 43 or DNS that you can dream of.
Okay. Time to be creative... but Cisco thought about this case!
You can configure your AP directly from the CLI to provide information to it... boot the AP, get yourself a console connection, and try:
AP0023.0410.4aea#lwapp ap ?
controller lwapp primary controller
hostname Configure ap hostname
ip lwapp ap ip command
log-server Configure the syslog server where all LWAPP errors will be logged
As you can see, you can give your AP, in LWAPP mode, information about a controller:
AP0023.0410.4aea#lwapp ap controller ?
ip lwapp primary controller ip
AP0023.0410.4aea#lwapp ap controller ip
AP0023.0410.4aea#lwapp ap controller ip ?
address Configure primary Controller IP address
AP0023.0410.4aea#lwapp ap controller ip add
AP0023.0410.4aea#lwapp ap controller ip address ?
A.B.C.D Controller IP address
AP0023.0410.4aea#lwapp ap controller ip address 10.1.1.10
Done. You AP knows how to get to a controller (careful, if your AP is already connected to a controller, using this command does not make any sense anymore, and you get a nice "ERROR!!! Command is disabled" when you issue it).
You can also give some other information to your AP, such as AP hostname, or syslog IP address where to dump all issues that the AP might encounter while trying to get to your controller. A useful one is the AP IP address:
AP0023.0410.4aea#lwapp ap ip ?
address Configure ap static IP address
default-gateway Configure Default-gateway IP address
Configure both! The AP needs both to get out of the local network.
Once the AP is configured, you can use the show lwapp family of commands to check what is going on, such as the show lwapp ip config to check your AP IP details, or the show lwapp client config to check controller config and friends:
AP0023.0410.4aea#show lwapp client config
location default location
mwarName (these are the primary, secondary, tertiary controllers)
Discovery Timer 10 secs
Heart Beat Timer 30 secs
Led State Enabled 1
Configured Switch 1 Addr 10.1.1.10
With this command, no more AP lost in the dark, far from its controller!
A blog with tips, tricks and tutorials to help you prepare your CCIE Wireless lab exam.