On a similar note, I just recently became aware of Cumulus[1] Debian based switches (but the good bits are closed source) from among others edge-core[2] (via a presentation by PaaS-provider http://zetta.io) -- eg:

http://whiteboxswitch.com/products/edge-core-as4600-54t

[1] http://cumulusnetworks.com/support/faq/

[2] http://www.edge-core.com/

thanks, good to know!