Selecting a managed switch with Linux, for use in mesh network project (batman-adv)

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http://unix.stackexchange.com – I am interested in trying out batman-adv to manage a mesh network comprised of point-to-point radios (mesh links) and cellular modems (gateways). Each node would have one p2p radio, and some nodes would also have one cell modem. All nodes would also have a device that uses the network (small embedded device with ethernet interface), so in total there are three ethernet devices. In order to keep the power and size foot print small, I want to stay away from using a computer with three nics, and I was wondering if there are routers (no need to be wireless, 802.11 won't be used) that would be su (HowTos)