Here is how to configure Option 43 on an MX appliance for a Cisco Aironet or Catalyst AP to discover its Wireless LAN Controller (WLC).

My Catalyst 9800-CL controller IP address: 173.38.219.33

MX appliance configuration

Structure of the hex string

“f1:04” tells the AP that only one WLC IP address is used, followed by the actual address:

“ad” is hex representation of 173
“26” is hex representation of 38
“db” is hex representation of 219
“21” is hex representation of 33

AP successfully discovers the controller

Two controllers

If you use two controllers, then simply change “f1:04” to “f1:08” and append the second controller’s IP address in hex representation to the end of the hex string.

Primary controller IP address: 173.38.219.33
Secondary controller IP address: 173.38.219.34
Hex string: f1:08:ad:26:db:21:ad:26:db:22

Přečteno 1x, z toho 1x dnes.