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Flex+Bridge, vWLC, and DHCP problems

I have a vWLC and some 3702i's, all running the latest code.  This is a small, simplified lab/branch-office type deployment with only a couple of AP's.

On the LAN, there is DHCP provided by a Windows host.  Everything works fine in FlexConnect mode with local switching.  However, if I switch an AP over to Flex+Bridge mode, making no other changes but that, the clients can initially connect and communicate with LAN hosts, but after about 3-5 minutes, they'll drop off and not be able to ping anything except the controller.  However, the interface still indicates that it has a valid IP.  If I renew the DHCP lease though, it immediately starts working again, for another 3-5 minutes.  If I switch the AP back to FlexConnect mode, everything goes back to working correctly.

I thought the purpose of Flex+Bridge was that everything would work exactly the same as FlexConnect, but with the ability to connect mesh AP's as well.  Has anyone encountered this behavior before, and/or have any idea what I might be missing?

 

Thanks in advance!

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