They claim that they're developing routers since 1995 and they're used widely in domestic Japan (SME and SOHO).

Looks like switches came in 2011 and there's some secret sauce which makes them autoconfigure each-other to reduce networking setup.

It might not be a standard OEM stuff.

Citing the page:

> Yamaha entered the router business in 1995, and has grown to hold a significant share of Japan’s small to medium enterprise and SOHO network market. Yamaha gigabit L2 switches that could be linked to Yamaha routers/firewalls were introduced in 2011, with features that significantly reduced the network setup, maintenance, and management workload.