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Signaling Extensions for Wavelength Switched Optical Networks

Signaling Extensions for Wavelength Switched Optical Networks. draft-bernstein-ccamp-wson-signaling-03.txt. Greg Bernstein Grotto Networking Young Lee Huawei Sugang Xu NICT Hiroaki Harai NICT Daniel King Old Dog Consulting. WSON Signaling Extensions.

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Signaling Extensions for Wavelength Switched Optical Networks

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  1. Signaling Extensions for Wavelength Switched Optical Networks draft-bernstein-ccamp-wson-signaling-03.txt Greg Bernstein Grotto Networking Young Lee Huawei Sugang Xu NICT Hiroaki Harai NICT Daniel King Old Dog Consulting

  2. WSON Signaling Extensions • Provide extensions to Generalized Multi-Protocol Label Switching (GMPLS) signaling for control of Wavelength Switched Optical Networks (WSON). Changes from 02: • Added requirements for support of distributed wavelength assignment applications/optimizations. • Generalized Wavelength Set Metric TLV for additional use scenarios/applications. • Added explanatory text on three new applications/optimizations.

  3. New WSON Signaling Requirements • Distributed Wavelength Assignment Support: • Backward Blocking Reduction In WSON without wavelength converters, backward blocking due to resource contentions is the predominant blocking contribution, when traffic load is low or highly-dynamic as when lightpath restoration takes place [Giorgetti08]. • Efficient Wavelength Converter Assignment When a WSON has some nodes with wavelength converters the efficient use of these scarce resources is desired [Andriolli06]. • Shared Mesh Wavelength Assignment The reuse of protection bandwidth is desirable in some applications. In WSONs we need to consider wavelength selection in this process [Ji].

  4. New Contributors and References • Contributors • Nicola Andriolli (Scuola Superiore Sant’Anna, Pisa, Italy) • Aessio Giorgetti (Scuola Superiore Sant’Anna, Pisa, Italy) • Lin Guo (Beijing University of Posts and Telecommunications) • References • [Andriolli06] N. Andriolli et al., "Label preference schemes in GMPLS controlled networks," Communications Letters, IEEE, vol. 10, 2006, pp. 849-851. • [Giorgetti08] Alessio Giorgetti, Nicola Sambo, Isabella Cerutti, Nicola Andriolli, and Piero Castoldi, "Label Preference Schemes for Lightpath Provisioning and Restoration in Distributed GMPLS Networks", to appear IEEE Journal of Lightwave Technology. • [Ji] Yuefeng Ji and Lin Guo, "MSWS Method to Support Shared-Mesh Restoration for Wavelength Switched Optical Networks", work in progress: draft-ji-ccamp-wson-msws-00.txt, July 2008.

  5. New Wavelength Set Metric 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Strct | MSize | Num Metrics | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Wavelength Metric Info | | From lowest to highest frequency if more that one value | | ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ • Type • 0 - Backward blocking reduction [Giorgetti08] • 1 - Wavelength converter assignment [Andriolli06] • 2 - Most Sharable Wavelength per Segment mesh restoration wavelength assignment method [Ji] • 3 - Least Loaded Wavelength Assignment • Strct (0 → Single Value, 1 → List) • MSize (0 → 8 bits, 1 → 16 bits, 2 → 32 bits)

  6. Next Steps • Adopt as a WG document  • Work to finalize signal characterization • (working with ITU-T on this) • Assess demand for distributed bidirectional lightpath assignment using different wavelengths on different directions. • Revise encodings as necessary

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