Abstract

We quantify the value-added proposition of the generalized multiprotocol label switching (GMPLS) distributed control plane vis à vis the centralized network management (CNM) plane. Our main objective is not to propose new protocols or algorithms, but rather to provide guidance to network operators on how to maximize the benefits of deploying a GMPLS control plane. We identify two main goals for maximizing these benefits: (1) decreasing operations costs and (2) increasing revenues through enhancing the efficiency of existing network assets as well as through enabling new services. Control plane functionalities such as dynamic routing, user-initiated end-to-end connection setup, and distributed fault management in IP optical networks are analyzed to determine optimal operating regions where their values are maximized. Extensive simulations using NSFNET topology have been carried out from which we have found that there are certain operating regions where (1) the distributed routing can improve the efficiency of network assets by saving 15% of the number of wavelengths per link, or increasing traffic loads by 20%. However, if the call interarrival time is shorter than 1 min, the efficiency (in terms of call blocking ratio) of distributed dynamic routing is reduced due to the OSPF convergence delay. (2) Enabling bandwidth on demand (BoD) services at finer bandwidth granularities connections is more cost-effective to the operator than doing the same at coarse bandwidth granularities. (3) The connection setup delay is the limiting factor in determining the types of BoD services a carrier offers. The call blocking ratio will increase quickly if the average call interarrival time is less than tens of seconds. (4) Assuming only single link failure, M:N shared protection can achieve 100% recovery at the expense of 10% increase in the number of wavelengths compared with nonprotection schemes, while saving are as high as 48% wavelengths compared with 1:1 dedicated protection.

© 2005 Optical Society of America

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References

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  1. E. Mannie, "Generalized multi-protocol label switching (GMPLS) architecture, " IETF RFC 3945, Oct. 2004.
  2. E. Mannie and D. Papadimitriou, "Generalized multi-protocol label switching (GMPLS) extensions for synchronous optical network (SONET) and synchronous digital hierarchy (SDH) control, " IETF RFC 3946, Oct. 2004.
  3. W. Alanqar and A. Jukan, "Extending end-to-end optical service provisioning and restoration in carrier networks: opportunities, issues, and challenges, " IEEE Commun. Mag. 42(1), 52-60 (2004).
  4. A. Jajszczyk, "Automatically switched optical networks: benefits and requirements, " IEEE Commun. Mag. 43(2), S10-S15 (2005).
  5. P. Iovanna, M. Settembre, R. Sabella, G. Conte, and L. Valentini, "Performance analysis of a traffic engineering solution for multilayer networks based on the GMPLS paradigm, " IEEE J. Sel. Areas Commun. 22, 1731-1740 (2004).
  6. N. Ghani, S. Dixit, and T. S. Wang, "On IP-WDM integration: a retrospective, " IEEE Commun. Mag. , Vol. 41, Iss. 9, (Sept. 2003) pp.42-45.
  7. Y. Luo and N. Ansari, "A computational model for estimating blocking probabilities of multifiber WDM optical networks, " IEEE Commun. Lett. 8, 60-62(2004).
  8. R. B. Cooper, Introduction to Queuing Theory, 2nd ed. (North Holland, New York, 1981).
  9. J. Zheng and H. T. Mouftah, "Dynamic lightpath restoration based on bidirectional initiation for wavelength-routed WDM networks," IEE Proc. Commun. 150, 409-413 (2003).

IEE Proc. Commun. (1)

J. Zheng and H. T. Mouftah, "Dynamic lightpath restoration based on bidirectional initiation for wavelength-routed WDM networks," IEE Proc. Commun. 150, 409-413 (2003).

IEEE Commun. Lett. (1)

Y. Luo and N. Ansari, "A computational model for estimating blocking probabilities of multifiber WDM optical networks, " IEEE Commun. Lett. 8, 60-62(2004).

IEEE Commun. Mag. (3)

N. Ghani, S. Dixit, and T. S. Wang, "On IP-WDM integration: a retrospective, " IEEE Commun. Mag. , Vol. 41, Iss. 9, (Sept. 2003) pp.42-45.

W. Alanqar and A. Jukan, "Extending end-to-end optical service provisioning and restoration in carrier networks: opportunities, issues, and challenges, " IEEE Commun. Mag. 42(1), 52-60 (2004).

A. Jajszczyk, "Automatically switched optical networks: benefits and requirements, " IEEE Commun. Mag. 43(2), S10-S15 (2005).

IEEE J. Sel. Areas Commun. (1)

P. Iovanna, M. Settembre, R. Sabella, G. Conte, and L. Valentini, "Performance analysis of a traffic engineering solution for multilayer networks based on the GMPLS paradigm, " IEEE J. Sel. Areas Commun. 22, 1731-1740 (2004).

Other (3)

E. Mannie, "Generalized multi-protocol label switching (GMPLS) architecture, " IETF RFC 3945, Oct. 2004.

E. Mannie and D. Papadimitriou, "Generalized multi-protocol label switching (GMPLS) extensions for synchronous optical network (SONET) and synchronous digital hierarchy (SDH) control, " IETF RFC 3946, Oct. 2004.

R. B. Cooper, Introduction to Queuing Theory, 2nd ed. (North Holland, New York, 1981).

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