The multi-granularity concept in optical networks is the ability to simultaneously switch different levels of granularity inside a given optical network. Optical multi-granularity and particularly waveband switching raises some issues for GMPLS. These have been partially addressed in [GMPLS-ARCH] and [GMPLS-SIG] from the CCAMP Working Group. However, enabling multi-granularity in optical networks demands the definition of a more complete set of requirements considering the management, control, routing and signaling issues and their impacts in the GMPLS protocols suite. In this framework document we propose to extend GMPLS previous set of switching capabilities in the optical domain. This by identifying uncovered characteristics of the optical transport, taking into account interest for optical components working at the band level and its impact on the control of the optical networks.