Even if there were many main stream options, Level 3 would not likely deploy much more than two in each level of it's network because of the complexity of manag

Even if there were many main stream options, Level 3 would not likely deploy much more than two in each level of it's network because of the complexity of managing and maintaining them. It might even be worse with OpenFlow if the majority of hardware vendors deployed the same open-source derived software, all with the same bug.