Signaling Extensions for Wavelength Switched Optical Networks

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
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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 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.

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New Contributors and References

• Contributors
• Nicola Andriolli (Scuola Superiore SantAnna,
  Pisa, Italy)
• Aessio Giorgetti (Scuola Superiore SantAnna,
  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
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)

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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