A new flexible grid of DWDM has been developed within the ITU-T
Study Group 15 to allow a more efficient spectrum allocation. In
such environment a data plane connection is switched based on the
allocated variable width optical spectrum frequency slot. This new
switching capability is referred to as Spectrum Switched Optical
Networks (SSON). This draft describes the framework for the
application of a GMPLS control plane to a SSON.