Impairment-Aware (IA) Routing and Wavelength Assignment (RWA)
function might be required in Wavelength Switched Optical Networks
(WSON) that already support RWA. This document defines proper
encoding to support this operation. It goes in addition to the
available impairment-free WSON encoding and it is fully compatible
As the information model, the encoding is independent from control
plane architectures and protocol implementations. Its definitions
can be used in related protocol extensions.