You do realize that anarchism is defined loosely enough to be quite inclusive of varying degrees of social control? The most anarchic anarchist society would end in mob rule, but few anarchists want that. Because of this you end up with a broad spectrum of people in the definition of 'anarchists'; those that want more municipal level communist elements to those who advocate strongly for primitivism, and also the "American" libertarians/AnCaps.
To my understanding, the policing model most compatible with "anarchism" would involve community selected individuals to be members of the police force. How practical of a model this might be is completely up for debate. The AnCaps would argue whoever has the money to pay for police deserve police...? Something like that.