How do I set up a multi-hop mesh?

A multi-hop mesh is a special case of the single-hop and is configured by configuring a pair of single hop networks.

As seen in the diagram below, SSID1 and SSID2 will be the two SSIDs we would need, one for each hop. The first SSID is setup as a base-client on the first hop set of APs. the second SSID is setup as a base on the middle APs, and as a client on the 2nd hop of access points: