4 Installing the
Example 3: IP Address of Switch Configured in the AP
In this example, the administrator connects to the access point CLI and statically configures the IP addresses of two
Figure 32. L3 Discovery Example 2
WCS IP List
192.168.3.1.54
192.168.22.161
AP
UDP Discovery
Message
WCS 1
IP: 192.168.1.54
(5 | UDP | ||
M | Disc | ||
| |||
Seconds every | |||
| ssa o | ||
|
| g | |
| Later) | ||
WCS 2
IP: 192.168.22.161
The AP sends a UDP discovery message to the first IP address configured in its list. When the switch receives the message, it verifies that the vendor ID on the AP is valid, there is no existing SSL TCP connection to the access point, and the maximum number of managed APs hasn't been reached. If all these conditions are met then the switch sends an invitation message to the AP to start the SSL TCP connection.
If the AP does not receive an invitation from the first WCS configured in its list, it sends a UDP discovery message to the second WCS configured in the list five seconds after sending the message to the first WCS.
When an IP address of a WCS is configured on the AP, the AP only associates with that switch even if other switches discover the AP by using other mechanisms.
For more information about how to configure this discovery method, see “Setting the Switch IP Address in the
Example 4: DHCP Option
In this example, the administrator has configured the IP address of the WCS as an option in the DHCP response to the DHCP request that the AP sends the DHCP server.
Figure 33. DHCP Option Example
DHCP Request
DHCP Response
AP | DHCP Server |
Discovering Access Points and Peer Switches 59
