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Routing and Wavelength Assignment Information for Wavelength Switched Optical Networks

Routing and Wavelength Assignment Information for Wavelength Switched Optical Networks. draft-bernstein-ccamp-wson-info-01.txt. Greg Bernstein gregb@grotto-networking.com Grotto Networking. Authors/Contributors. Greg Bernstein (Grotto Networking) Young Lee (Huawei) Dan Li (Huawei)

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Routing and Wavelength Assignment Information for Wavelength Switched Optical Networks

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  1. Routing and Wavelength Assignment Information for Wavelength Switched Optical Networks draft-bernstein-ccamp-wson-info-01.txt Greg Bernstein gregb@grotto-networking.com Grotto Networking 70th IETF – Vancouver, December 2007

  2. Authors/Contributors • Greg Bernstein (Grotto Networking) • Young Lee (Huawei) • Dan Li (Huawei) • Wataru Imajuku (NTT) • Itaru Nishioka (NEC Corp.) • Diego Caviglia (Ericsson) 70th IETF – Vancouver, December 2007

  3. Information for RWA in WSON • Provides compact encodings for information needed for path computation and wavelength assignment in wavelength switched optical networks. Such encodings can be used in extensions to GMPLS routing for control of wavelength switched optical networks. • From WSON Framework: different RWA computational architectures have different info needs. 70th IETF – Vancouver, December 2007

  4. RWA Info Information Static/Dynamic Node/Link ------------------------------------------------------ Connectivity matrix Static Node Per port wavelength restrictions Static Node WDM link (fiber) lambda ranges Static Link WDM link channel spacing Static Link Laser Transmitter range Static Link Wavelength Conversion Static Node Wavelength Availability Dynamic Link • Key concepts for compact representations: • Wavelength encoding (Otani’s Label) • Wavelength Sets, Port Sets • Sparse matrix representation of asymmetric connectivity matrix 70th IETF – Vancouver, December 2007

  5. Example: Connectivity for a ROADM Ports #3-42 drop • 82 Port ROADM • 164 uni-directional ports  Amn is 82 x 82 matrix, i.e., 6724 entries • Can represent with only 30 32 bit words. See example in section 4.1 of draft. add … … line line 2-Degree ROADM Port #1 Port #2 … … add drop Ports #43-82 70th IETF – Vancouver, December 2007

  6. Example: Wavelength Availability Info • 40 Channel C-Band WDM subsystem • with 100GHz spacing with lowest frequency 192.0THz (1561.4nm) and highest frequency 195.9THz (1530.3nm). Now suppose the following channels are available (THz):192.0, 192.5, 193.1, 193.9, 194.0, 195.2, 195.8 • Compactly represented by four 32 bit words (regardless of number of available channels). See section 3.3.3 of draft. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action = 4 | Reserved | Num Wavelengths = 40 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S. |S| Reserved | n for lowest frequency = -11 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1 0 0 0 0 0 1 0| Not used in 40 Channel system (all zeros) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 70th IETF – Vancouver, December 2007

  7. Motivation/Next Steps • Motivation • To show WSON info for RWA can be compactly represented • To be used in more realistic assessments of routing protocol scalability • To understand information requirement for PCE independent of routing protocol enhancement • Potentially to be used in other protocols such as signaling (RSVP-TE) and PCEP • Next Steps • Adopt as a working group document as a repository of encodings of information used for WSON 70th IETF – Vancouver, December 2007

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