When you set up WDS, each main, remote, or relay makes a record of each of the other stations to which it has a direct, wireless connection. Changing AirPort Express from WDS to client mode does not remove the other base stations' records. They continue to regard it as a WDS station until you remove the record(s). Here are the records the stations keep:
- The main station has a record of relay and remote stations that connect directly to it. It does not have a record of any remote that connects to a relay.
- A relay station has records for both its main and any remote that connects to it.
- A remote only has one record, for the main or relay it connects to.
Suppose you had two AirPort Extreme base stations set up as a main and a relay, with your AirPort Express set up as the remote. If you took the remote out of WDS mode and put it into client mode, you would need to connect to the relay station using AirPort Admin Utility and change its setup. Here's what WDS setup looks like for a relay station:
In the picture, the AirPort Express has a network name of "Maui." So you would select Maui, then click the minus button indicated by the red arrow. Because this relay station has no remotes other than Maui, you should also change it from a relay to a remote station.