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The Username and Password defined on the WDS AP and the infrastructure APs is the same?? and this username and password must be defined on the ACS Server.
each infra autenticates itself on the ACS. WDS doesn't. If you want the WDS AP to connect clients then it will play both the roles. It will autenticate itself through itself on the ACS. Infra AP has a config line started "wlccp ap username ..."