Iirc it's on the roadmap for thier next generation of switches. bummer, as performance and per-port cost are certainly tasty. Afaik low latency is due to the fact that Arista boxes are doing cut through.
no shock there
Pricewise they are very attractive. And Arista EOS actually is more or less a full blown Linux which allows you to do _really_ tricky things.
and they expose, not hide it. so you can do management in python, which i think is damned cool. shame it wasn't unix. i have street gossip that basic mac security may be testable quite soon, but more serious port security is some months off. at that point, it should be an interesting device to try in a small exchange. billo dropped one into the ietf network, it looked to be a bitchin' device for datacenter deployment, which i gather is the intended market. randy