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Signaling Extensions for Wavelength Switched Optical Networks

draft-bernstein-ccamp-wson-signaling-03.txt

Greg Bernstein Grotto NetworkingYoung Lee HuaweiSugang Xu NICTHiroaki Harai NICTDaniel King Old Dog Consulting

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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.

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New WSON Signaling Requirements

• Distributed Wavelength Assignment Support:

– Backward Blocking ReductionIn 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 AssignmentWhen a WSON has some nodes with wavelength converters the efficient use of these scarce resources is desired [Andriolli06].

– Shared Mesh Wavelength AssignmentThe reuse of protection bandwidth is desirable in some

applications. In WSONs we need to consider wavelength selection in this process [Ji].

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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.

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New Wavelength Set Metric

– 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)

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 | | ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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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