The continuous increase of flexibility and bit rate in optical
networks has higher and higher impacts on inter-channel effects (e.g.
Cross-phase modulations). This effect leads to the introduction of
Guard Bands between adjacent light paths in order to reduce the
inter-channel detrimental effects.
This document provides requirements for the devolpment of protocol
extensions to support Generalized Multi-Protocol Label Switching
(GMPLS) and Path Computation Element (PCE) management of Guard Bands.