WSON Information Model for Path Computation

Routing and Wavelength Assignment Information Model for Wavelength Switched Optical Networks

Abstract

This document provides a model of information needed by the routing and wavelength assignment (RWA) process in wavelength switched optical networks (WSONs). The purpose of the information described in this model is to facilitate constrained lightpath computation in WSONs. This model takes into account compatibility constraints between WSON signal attributes and network elements but does not include constraints due to optical impairments. Aspects of this information that may be of use to other technologies utilizing a GMPLS control plane are discussed.

Status and Background

This is a CCAMP working group document and is ready for last call. The official version can be found at http://datatracker.ietf.org/doc/draft-ietf-ccamp-rwa-info/

For extended discussion and examples of WDM switch modeling be sure to read the paper "Modeling WDM Wavelength Switching Systems for use in Automated Path Computation" attached below. Note that drawing detailed diagrams of various WDM switching devices is nearly impossible with ASCII line art as required in Internet Drafts so we've relegated the examples and figures to a separate paper.

We have introduced a representation for wavelength converter pools that may exist in WSON switches. This is a minimal state approximate model. Similar in spirit to the general WSON switch model that is already in the document.  A preliminary draft of a tutorial paper with examples can be found in the list of paper at the bottom of this page.