Also note Spotify published their own stuff also on Arista hardware

https://labs.spotify.com/2016/01/26/sdn-internet-router-part...

Podcast where David Barroso talks about it:

http://blog.ipspace.net/2015/01/sdn-router-spotify-on-softwa...

Arista blog post:

https://eos.arista.com/spotifys-sdn-internet-router/

Disclaimer I work at Arista