This document specifies the protocol extensions for support of Diffserv-aware MPLS Traffic Engineering (DS-TE). This includes generalization of the semantics of a number of Interior Gateway Protocol (IGP) extensions already defined for existing MPLS Traffic Engineering in RFC 3630@ RFC 3784@ and additional IGP extensions beyond those. This also includes extensions to RSVP-TE signaling beyond those already specified in RFC 3209 for existing MPLS Traffic Engineering. These extensions address the requirements for DS-TE spelled out in RFC 3564.