An 802.11s mesh backhaul can be rapidly deployed by taking advantage of the OpenWrt Firmware Selector (or the Image Builder) and the Mesh11sd package.
Rapid Deployment involves a few simple steps to create a flash image that contains all that is required to deploy a mesh network. The core of the mesh network is the mesh backhaul as it is the virtual wireless infrastructure that carries user data from one point to another in the background.
Full details including a working configuration can be found in the Mesh11sd Project documentation.