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ap1240 and BR1310 Bridge loop detected between WGB 0012.XXXX and device 0018.XXX

Hi,

We have the follow situation :

Host -- ethernet  --> AP1 (with wirelessClients)         < --- >  BR1 (BR1310) (with wirelessClients)  -- ethernet-- AP5  with wirelessClients

                                                                             < --- > BR2 (BR1310)    -- ethernet-- AP6  with wirelessClients

AP1 was untill may 2010  a AP1200(with VXworks OperatingSystem )

Till then, there were no problems.

Then  we changed AP1  with a AP1240G  ( autonomous, newest IOS).

Configured it as Root Brigde with clients.

When a client is working between AP1 and BR1310 we get the following error on AP1

        Bridge loop detected between WGB 0012.xxxx.yyyy and device 0018.bbbb.aaaa

and the clients connected to AP5 haven't connection to the Host.

But the BR2 -side  is working without problem.

Thank's for help.

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