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210 Configuring APs
NN47250-500 (320657-F Version 02.01)
● If the DHCP Offer message contained one or more IP addresses in the Option 43 field, the
AP sends a unicast Find WSS message to each address. The process skips to step 6.
● If the DHCP Offer message contained one or more hostnames in the Option 43 field, the
AP sends DNS Requests to the DNS server for the IP addresses of the hosts, then sends a
unicast Find WSS message to each address. The process skips to step 6.
● If no WSSs reply, the AP repeatedly resends the Find WSS messages. If no WSSs reply,
the process continues with step 3.
2 If no IP addresses or hostnames were specified in the Option 43 field of the DHCP Offer
message, the AP sends a Find WSS message to UDP port 5000 on the subnet broadcast address.
● WSSs in the same IP subnet as the AP receive the message and respond with a Find WSS
Reply message.
❍ If the AP is configured as a Distributed AP on a switch and the connection bias is
high, the WSS immediately sends a Find WSS Reply message.
❍ If the AP is configured as a Distributed AP on a switch but the connection bias is low,
that WSS waits one second, then sends a Find WSS Reply message. The delay allows
switches with high bias for the AP to respond first.
❍ If a WSS that receives the Find WSS message does not have the Distributed AP in its
configuration but another WSS in the same Mobility Domain does, the switch waits
two seconds, then sends a Find WSS Reply message with the IP address of the best
switch to use. The determination of best switch is based on the bias settings for the
AP on each switch and on the capacity of each switch to add new active AP
connections.
The process skips to step 6.
● If no WSSs reply, the AP repeatedly resends the Find WSS broadcast. If still no WSSs
reply, the process continues with step 3.
3 If the AP is unable to locate a WSS on the subnet it is connected to, and is unable to find a WSS
based on information in the DHCP option 43 field, the AP sends DNS requests for the
wlan-switch, where the DNS suffix for mynetwork.com is learned through DHCP.
4 The DNS server replies with the system IP address of a WSS.
● If only wlan-switch is defined in DNS, the AP sends a unicast Find WSS message to the
WSS whose IP address is returned for wlan-switch.
Note. This method requires DNS address records on the DNS server that map
the hostnames to the WSS IP addresses.
Note. You must configure a DNS address record on your DNS server for the
WSS IP address. Otherwise, the DNS server cannot provide the WSS’s address to
the AP.