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Discovering Access Points and Peer Switches 59
4 Installing the D-Link Unified Access System
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 D-Link WLAN Controller Switches that are allowed to manage the
AP.
Figure 32. L3 Discovery Example 2
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 D-Link Access Point” on page 67.
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
WCS 1
IP: 192.168.1.54
WCS 2
IP: 192.168.22.161
WCS IP List
192.168.3.1.54
192.168.22.161
AP
UDP Disc
o
very
M
e
ssa
g
e
(5 Seconds Later)
UDP Discovery
Message
AP
DHCP Server
DHCP Request
DHCP Response