As others have mentioned, it is indeed Arista: https://twitter.com/markimbriaco/status/276416483939213312

I think they should be more forward about naming and shaming, but I understand why they'd rather not. Personally I have horrible experience with Nortel/Avaya and would recommend anyone against using their equipment for core switching. The least worst, again in my experience, seem to be Cisco and Juniper.