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Signaling Extensions for Wavelength Switched Optical Networks

Signaling Extensions for Wavelength Switched Optical Networks. draft-bernstein-ccamp-wson-signaling-00.txt. Greg Bernstein gregb@grotto-networking.com Grotto Networking Young Lee ylee@huawei.com Huawei. Signaling Extensions for WSON.

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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-00.txt Greg Bernstein gregb@grotto-networking.com Grotto Networking Young Lee ylee@huawei.com Huawei 70th IETF – Vancouver, December 2007

  2. Signaling Extensions for WSON • Provides extensions to Generalized Multi-Protocol Label Switching (GMPLS) signaling for control of wavelength switched optical networks (WSON). These extensions build on previous work for the control of G.709 based networks. • Based on Routing with Distributed WA via Signaling (RWA computational architectures defined in WSON Framework) • Key extension areas: • Traffic parameters for optical signals • Wavelength Sets • Distributed Wavelength Assignment control 70th IETF – Vancouver, December 2007

  3. Optical Signal Parameters • Modulation Type (spectral characteristics) • General type such as NRZ, RZ, etc… • Any modulation specific parameters such as duty cycle for RZ, etc… • FEC Info • Note that more than one type of FEC maybe available. • Analog Bandwidth • In case of analog modulation • Spectral width/stability • Characteristic of the source laser (to be added in next revision) 70th IETF – Vancouver, December 2007

  4. Optical Signal Parameters • Chose to encode these as Traffic Parameters • RSVP-TE Sender-TSPEC and FlowSpec objects. • Similar to what was done in SONET/SDH, G.709 cases. • However some of these “parameters” may represent “choices” • Such as FEC or even bit rate and these may depend on path impairments (see Giovani’s draft) 70th IETF – Vancouver, December 2007

  5. Wavelength Sets • General notions that comes up when: • describing wavelength constraints on ports • describing laser transmitter range • describing WDM link wavelength availability • Most sensitive to space consumed • performing distributed wavelength assignment via signaling • Can be sensitive to space consumed 70th IETF – Vancouver, December 2007

  6. Wavelength Sets • Use label set concept • Take advantage of structure of wavelength label • 50% space reduction for ranges and lists can be helpful. • Introduce wavelength bit map • big space savings possible for current and future DWDM systems 70th IETF – Vancouver, December 2007

  7. Bit map Wavelength Set • Makes use of explicit channel spacing in lambda label • Takes advantage of relatively low count of lambda labels in existing and future systems (current systems well under 1000 lambdas, typically 40-100 lambdas) 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 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S. |S| Reserved | n for lowest frequency | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Bit Map Word #1 (Lowest frequency channels) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Bit Map Word #N (Highest frequency channels) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 70th IETF – Vancouver, December 2007

  8. Distributed Wavelength Assignment • Choice of Assignment Algorithm • E.g., Random, First Fit, Least Loaded, etc… • Directionality • Uni- or bi- directional assignment. Solves same problem as presented by Sugang Xu and uses same recommended mechanism. • Wavelength Set Metrics (supplemental) • Allows for the association of a metric with each lambda in a wavelength set for use by distributed assignment algorithm. • Example: multi-fiber assignment with least loaded lambda algorithm. 70th IETF – Vancouver, December 2007

  9. Relation to other Drafts • Giovani - GMPLS Signaling Extensions for Optical Impairment Aware Lightpath Setup • Includes FEC, Modulation Type but also has these as options that could be negotiated • Additionally: addresses linear impairments and OSNR • Focuses on signaling based approach to optical impairments, we are also interested in a PCE based approach so would consider some of this optional. • Xu - Extensions to GMPLS RSVP-TE for Bidirectional Lightpath with the Same Wavelength • Addresses bi-directional distributed wavelength assignment, proposes solution. We included this solution in our draft. 70th IETF – Vancouver, December 2007

  10. Next Steps • Determine how to move forward with various signaling drafts • Use a single general signaling draft or more focused “point” solutions and summarize these in the framework draft. • Wavelength sets – extend general label set to include a bit map or come up with a separate wavelength set that includes the bit map set option. 70th IETF – Vancouver, December 2007

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