Signaling Extensions for Wavelength Switched Optical Networks draftbernsteinccampwsonsignaling03
Signaling Extensions for Wavelength Switched Optical Networks draft-bernstein-ccamp-wson-signaling-03. txt Greg Bernstein Young Lee Sugang Xu Hiroaki Harai Daniel King Page - 1 Grotto Networking Huawei NICT Old Dog Consulting
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. Page - 2
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 [Giorgetti 08]. – Efficient Wavelength Converter Assignment When a WSON has some nodes with wavelength converters the efficient use of these scarce resources is desired [Andriolli 06]. – 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]. Page - 3
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 – [Andriolli 06] N. Andriolli et al. , "Label preference schemes in GMPLS controlled networks, " Communications Letters, IEEE, vol. 10, 2006, pp. 849 -851. – [Giorgetti 08] 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. Page - 4
New Wavelength Set Metric 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 [Giorgetti 08] • 1 - Wavelength converter assignment [Andriolli 06] • 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) Page - 5
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 Page - 6
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