How can I connect airport extremes using a wired-switch connection and have roaming capability?

My goal is to have 2 airport extremes and 1 timecapule connected via an ethernet switch so that I can enable roaming. I have no problems connecting them wirelessly where I create the wireless network on a primary airport wireless then add the others "extending" the network. However, if I attempt to do the same thing with a wired connection everything stops working (no connections from any airport). Here's the topology I'm trying to achieve. I believe my problem relates to the switch and the fact that I am serving up DHCP from a separate server. Is there a way I can achieve this (or similar) type of configuration? Thanks in advance.
BTW, I have read the various documents on the roaming network topology  but none seem to be a match to this.

To answer your question, yes, if I _only_ have the main "create wireless network" airport connected/wired to the switch, everything works correctly.
OK, got that.
Also, if I have each of the 3 airports/timecapsule "create wireless network" using the same ssid name and passwd/protocol, everything works correctly (but of course, no roaming under this scenario
Sorry, you have me confused on this one. When the AirPorts are all configured to "create a wireless network", use the same SSID, security and password, and all AirPorts are in Bridge Mode........that is the exact definition of a "roaming" network.
Not sure what you mean when you say "no roaming" in this configuration.
Also, if I have the main "create wireless network" configured and have the 2 other airports "extend the network" and _not_ have them connected via the ethernet cable, everything works correctly (wireless airport interconnection)
That is correct.
However, if I plug the 2 other "extend the network" airports into the switch via ethernet, all connectivity shuts down.
This is not a correct setup. The "extend" setting on the AirPort assumes that they will connect using wireless.  If you then try to connect an Ethernet cable to an AirPort that is expecting a wireless connection, that will result in a big feedback loop and effectively crash the network.

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