How does WLC prevent layer 2 loops between mesh and different wired networks

hi all,
i have a question in regards to layer 2 loops. in my network i have clients devices moving between 2 separated mesh networks. from WLC prespective, the mac addresses should've moved between multiple bridge group and wired network.
can someone please enlighten me how WLC prevent layer 2 loops?
i understand spanning tree in the wired network, but WLC is not using SPT in mesh
thank you

Thanks for your help! This really helps a lot! We actually only want to replace the autonmous access point with the controller solution and make one WLAN available at another site. From what I can see, this is possible with our current solution - we just need to switch from Layer 2 to Layer 3 and purchase the corresponding amount of supported Access Points (I think we should be able to get some refurbished ones).
Am I correct in assuming that the Access Points we want to replace (AIR-AP1230B-E-K9 with 802.11b radio only) cannot be upgraded to lightweight ones? Since if I understood document http://www.cisco.com/en/US/docs/wireless/access_point/conversion/lwapp/upgrade/guide/lwapnote.html correctly, this is not possible with access points that only have 802.11b radios.
Regarding the switch from Layer 2 to Layer 3: Do we really only need to perform the steps I described in my first post?
And one last question regarding REAP. As far as I understood this is only needed when local traffic needs to be maintained in case the connection to the WLC becomes unavailable. So we really don't need it if we want to access resources that are only available over the WLC?
Thanks again for your help!
Michael

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How does WLC prevent layer 2 loops between mesh and different wired networks

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