Routing and Wavelength Assignment Information Model for Wavelength

Routing and Wavelength Assignment Information Model for Wavelength Switched Optical Networks draft-ietf-ccamp-wson-info-02. txt Greg Bernstein Young Lee Page - 1 gregb@grotto-networking. com Grotto Networking ylee@huawei. com Huawei 74 th IETF – San Francisco, CA, March 2009

Authors/Contributors • • Greg Bernstein (Grotto Networking) Diego Caviglia (Ericsson) Ander Gavler (Acreo AB) Young Lee (Huawei) Dan Li (Huawei) Wataru Imajuku (NTT) Jonas Martensson (Acreo AB) Itaru Nishioka (NEC Corp. ) Page - 2 74 th IETF – San Francisco, CA, March 2009

Information for RWA in WSON • Contains high level path computation info model for WSONs – Not a management info model, but a path computation information model • Changes from 01. txt – Added text on multiple fixed and switched connectivity matrices. – Added text on the relationship between SRNG and SRLG and encoding considerations. – Added clarifying text on the meaning and use of port/wavelength restrictions. – Added clarifying text on wavelength availability information and how to derive wavelengths currently in use. Page - 3 74 th IETF – San Francisco, CA, March 2009

Connectivity Matrices and Port Constraints • Modeling issue – Port-Wavelength constraints need to be associated with a connectivity matrix – Currently support up to one fixed and one switched matrix – Most general is allow multiple matrices of each type and corresponding port-wavelength constraints. – Recommend unifying approach: (a) matrix number, (b) matrix type, (c) matrix content. General model with multiple matrices and port-wavelength constraints associated with each matrix Page - 4 74 th IETF – San Francisco, CA, March 2009

Clarification on Wavelength in Use • Port-Wavelength Constraints – Tells us both wavelength restrictions from ROADM (or switch) and link. • Wavelengths Available – Just what it claims • Wavelengths in Use – The “difference” between the port-wavelength constraints and wavelengths available. • Still to be considered: Shared Wavelengths for protection Page - 5 74 th IETF – San Francisco, CA, March 2009

Next Steps • Solicit input for shared protection wavelength modeling • Finalize switch model – Current model in draft allows up to one fixed and one switched connectivity matrix with corresponding port/wavelength constraints. Recommend generalizing this since we need association between port-wavelength constraints and matrices for encoding. Page - 6 74 th IETF – San Francisco, CA, March 2009