[patrickg_zill]

You can do some of it via BGP, which is a standard method for handling routing once you become any sort of server provider with multiple bandwidth providers. It is builtin to some Juniper devices already, for instance: http://njetwork.wordpress.com/2013/04/30/mitigating-ddos-att...

There are other ways to do it via BGP also. Plus there is null-routing, bandwidth limiting, etc.

[devicenull]

juniper is the only one that provides that and flowspec is not going to be able to block everything. Other then that BGP is not really going to help with attacks.