Abstract

In any dynamic control plane architecture targeting connection-oriented networks, the path computation function can be defined as the one that deals with obtaining a route for a given request or, equivalently, with finding appropriate resources to be allocated to new incoming flows within the network, given the knowledge of the network status, its topology and resource availability, and the applicable constraints and policies. The path computation function can be located in a network management system or in one or more network elements. In the scope of a distributed control plane such as multiprotocol label switching (MPLS) and generalized MPLS, such a function is commonly located either in a process running on each node controller (referred to as source routing) or deployed using a dedicated entity. To this end, the Internet Engineering Task Force defines a path computation element (PCE) as a control plane functional component which is able to perform constrained path computation on a graph representing a network. This paper provides an overview of PCEs and elaborates on selected aspects regarding the deployment and use of PCEs as a functional element in the framework of control and management of optical networks, highlighting the motivations behind their adoption, common deployment models, and related testbed experimentation. The paper also briefly explores new trends such as the extensions for the so-called stateful PCEs and the role of PCEs in software defined networks.

© 2013 Optical Society of America

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2013 (2)

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “Design and experimental validation of a GMPLS/PCE control plane for elastic CO-OFDM optical networks,” IEEE J. Sel. Areas Commun., vol.  31, no. 1, pp. 49–61, Jan. 2013.

L. Liu, R. Casellas, T. Tsuritani, I. Morita, R. Martínez, and R. Muñoz, “Experimental demonstration of an OpenFlow/PCE integrated control plane for IP over translucent WSON with the assistance of a per-request-based dynamic topology server,” Opt. Express, vol.  21, no. 4, pp. 4183–4193, Feb. 2013.
[CrossRef]

2012 (3)

2011 (3)

2010 (1)

A. Giorgetti, F. Cugini, N. Sambo, F. Paolucci, N. Andriolli, and P. Castoldi, “Path state-based update of PCE traffic engineering database in wavelength switched optical networks,” IEEE Commun. Lett., vol.  14, no. 6, pp. 575–577, 2010.
[CrossRef]

2009 (1)

Ali, Z.

Q. Zhao, D. King, F. Verhaeghe, T. Takeda, Z. Ali, and J. Meuric, “Extensions to the path computation element communication protocol (PCEP) for point-to-multipoint traffic engineering label switched paths,” , Sept. 2010 [Online]. Available: http://www.ietf.org/rfc/rfc6006.txt .

Anderson, T.

L. Yang, R. Dantu, T. Anderson, and R. Gopal, “Forwarding and control element separation (ForCES) framework,” , Apr. 2004 [Online]. Available: http://www.ietf.org/rfc/rfc3746.txt .

Andriolli, N.

A. Giorgetti, F. Cugini, N. Sambo, F. Paolucci, N. Andriolli, and P. Castoldi, “Path state-based update of PCE traffic engineering database in wavelength switched optical networks,” IEEE Commun. Lett., vol.  14, no. 6, pp. 575–577, 2010.
[CrossRef]

Ash, J.

A. Farrel, J.-P. Vasseur, and J. Ash, “A path computation element (PCE)-based architecture,” , Aug. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4655.txt .

J. Ash and J. L. Roux, “Path computation element (PCE) communication protocol generic requirements,” , Sept. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4657.txt .

Ayyangar, A.

J. Vasseur, A. Ayyangar, and R. Zhang, “A per-domain path computation method for establishing inter-domain traffic engineering (TE) label switched paths (LSPs),” , Feb. 2008 [Online]. Available: http://www.ietf.org/rfc/rfc5152.txt .

A. Farrel, J.-P. Vasseur, and A. Ayyangar, “A framework for inter-domain multiprotocol label switching traffic engineering,” , Nov. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4726.txt .

Bitar, N.

J. Vasseur, R. Zhang, N. Bitar, and J. L. Roux, “A backward-recursive PCE-based computation (BRPC) procedure to compute shortest constrained inter-domain traffic engineering label switched paths,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5441.txt .

Bradford, R.

R. Bradford, J. Vasseur, and A. Farrel, “Preserving topology confidentiality in inter-domain path computation using a path-key-based mechanism,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5520.txt .

Burger, E.

J. Seedorf and E. Burger, “Application-layer traffic optimization (ALTO) problem statement,” , Oct. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5693.txt .

Casellas, R.

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “Design and experimental validation of a GMPLS/PCE control plane for elastic CO-OFDM optical networks,” IEEE J. Sel. Areas Commun., vol.  31, no. 1, pp. 49–61, Jan. 2013.

L. Liu, R. Casellas, T. Tsuritani, I. Morita, R. Martínez, and R. Muñoz, “Experimental demonstration of an OpenFlow/PCE integrated control plane for IP over translucent WSON with the assistance of a per-request-based dynamic topology server,” Opt. Express, vol.  21, no. 4, pp. 4183–4193, Feb. 2013.
[CrossRef]

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “GMPLS/PCE control of flexi-grid DWDM optical networks using CO-OFDM transmission [invited],” J. Opt. Commun. Netw., vol.  4, no. 11, pp. B1–B10, Nov. 2012.
[CrossRef]

R. Vilalta, R. Muñoz, R. Casellas, and R. Martínez, “Dynamic virtual GMPLS-controlled WSON using a resource broker with a VNT manager on the ADRENALINE testbed,” Opt. Express, vol.  20, no. 28, pp. 29149–29154, Dec. 2012.
[CrossRef]

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, I. Morita, and M. Tsurusawa, “Dynamic virtual link mesh topology aggregation in multi-domain translucent WSON with hierarchical-PCE,” Opt. Express, vol.  19, no. 26, pp. B611–B620, Dec. 2011.
[CrossRef]

R. Casellas, R. Martinez, R. Muñoz, and S. Gunreben, “Enhanced backwards recursive path computation for multi-area wavelength switched optical networks under wavelength continuity constraint,” J. Opt. Commun. Netw., vol.  1, no. 2, pp. A180–A193, July 2009.
[CrossRef]

R. Martinez, A. Castro, R. Casellas, R. Muñoz, L. Velasco, R. Vilalta, and J. Comellas, “Experimental validation of dynamic restoration in GMPLS-controlled multi-layer networks using PCE-based global concurrent optimization,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013, paper OWG4G.3.

R. Vilalta, R. Muñoz, R. Casellas, and R. Martínez, “Dynamic wavelength allocation algorithms for on-demand deployment of GMPLS-controlled virtual WSON using a VON resource broker,” in Proc. of the 17th European Conf. on Network and Optical Communications (NOC) and the 7th Conf. on Optical Cabling and Infrastructure (OC&I), Vilanova i la Geltrú, Spain, July 2012.

R. Casellas, R. Muñoz, and R. Martínez, “Path computation elements (PCEs): Applications and status (invited paper),” in Optical Fiber Communication Conf. and the Nat. Fiber Optic Engineers Conf., Anaheim, CA, Mar. 2013, paper NTu3F.3.

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, and I. Morita, “An integrated stateful PCE/OpenFlow controller for the control and management of flexi-grid optical networks,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013.

R. Muñoz, R. Casellas, and R. Martínez, “An open GMPLS-enabled control plane testbed for remote development and experimentation of PCE-based path computation algorithms,” in Proc. of Future Networks and Mobile Summit, Warsaw, Poland, June 2011.

Castoldi, P.

F. Cugini, G. Meloni, F. Paolucci, N. Sambo, M. Secondini, L. Gerardi, L. Poti, and P. Castoldi, “Demonstration of flexible optical network based on path computation element,” J. Lightwave Technol., vol.  30, no. 5, pp. 727–733, Mar. 2012.
[CrossRef]

F. Paolucci, N. Sambo, F. Cugini, A. Giorgetti, and P. Castoldi, “Experimental demonstration of impairment-aware PCE for multi-bit-rate WSONS,” J. Opt. Commun. Netw., vol.  3, no. 8, pp. 610–619, Aug. 2011.
[CrossRef]

A. Giorgetti, F. Cugini, N. Sambo, F. Paolucci, N. Andriolli, and P. Castoldi, “Path state-based update of PCE traffic engineering database in wavelength switched optical networks,” IEEE Commun. Lett., vol.  14, no. 6, pp. 575–577, 2010.
[CrossRef]

F. Paolucci, F. Cugini, A. Giorgetti, N. Sambo, and P. Castoldi, “A survey on the path computation element (PCE) architecture,” IEEE Commun. Surveys Tutorials, to be published.
[CrossRef]

Castro, A.

R. Martinez, A. Castro, R. Casellas, R. Muñoz, L. Velasco, R. Vilalta, and J. Comellas, “Experimental validation of dynamic restoration in GMPLS-controlled multi-layer networks using PCE-based global concurrent optimization,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013, paper OWG4G.3.

Comellas, J.

R. Martinez, A. Castro, R. Casellas, R. Muñoz, L. Velasco, R. Vilalta, and J. Comellas, “Experimental validation of dynamic restoration in GMPLS-controlled multi-layer networks using PCE-based global concurrent optimization,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013, paper OWG4G.3.

Cugini, F.

F. Cugini, G. Meloni, F. Paolucci, N. Sambo, M. Secondini, L. Gerardi, L. Poti, and P. Castoldi, “Demonstration of flexible optical network based on path computation element,” J. Lightwave Technol., vol.  30, no. 5, pp. 727–733, Mar. 2012.
[CrossRef]

F. Paolucci, N. Sambo, F. Cugini, A. Giorgetti, and P. Castoldi, “Experimental demonstration of impairment-aware PCE for multi-bit-rate WSONS,” J. Opt. Commun. Netw., vol.  3, no. 8, pp. 610–619, Aug. 2011.
[CrossRef]

A. Giorgetti, F. Cugini, N. Sambo, F. Paolucci, N. Andriolli, and P. Castoldi, “Path state-based update of PCE traffic engineering database in wavelength switched optical networks,” IEEE Commun. Lett., vol.  14, no. 6, pp. 575–577, 2010.
[CrossRef]

F. Paolucci, F. Cugini, A. Giorgetti, N. Sambo, and P. Castoldi, “A survey on the path computation element (PCE) architecture,” IEEE Commun. Surveys Tutorials, to be published.
[CrossRef]

Dantu, R.

L. Yang, R. Dantu, T. Anderson, and R. Gopal, “Forwarding and control element separation (ForCES) framework,” , Apr. 2004 [Online]. Available: http://www.ietf.org/rfc/rfc3746.txt .

Escalona, E.

R. Nejabati, E. Escalona, S. Peng, and D. Simeonidou, “Optical network virtualization,” in Int. Conf. of Optical Network Design and Modeling (ONDM), 8–10 Feb. 2011.

Fabrega, J. M.

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “Design and experimental validation of a GMPLS/PCE control plane for elastic CO-OFDM optical networks,” IEEE J. Sel. Areas Commun., vol.  31, no. 1, pp. 49–61, Jan. 2013.

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “GMPLS/PCE control of flexi-grid DWDM optical networks using CO-OFDM transmission [invited],” J. Opt. Commun. Netw., vol.  4, no. 11, pp. B1–B10, Nov. 2012.
[CrossRef]

Farrel, A.

A. Farrel, J.-P. Vasseur, and J. Ash, “A path computation element (PCE)-based architecture,” , Aug. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4655.txt .

A. Farrel, J.-P. Vasseur, and A. Ayyangar, “A framework for inter-domain multiprotocol label switching traffic engineering,” , Nov. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4726.txt .

H. Gredler, J. Medved, S. Previdi, A. Farrel, and S. Ray are preparing a manuscript to be called “North-bound distribution of link-state and TE information using BGP.”

R. Bradford, J. Vasseur, and A. Farrel, “Preserving topology confidentiality in inter-domain path computation using a path-key-based mechanism,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5520.txt .

E. Oki, T. Takeda, and A. Farrel, “Extensions to the path computation element communication protocol (PCEP) for route exclusions,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5521.txt .

D. King and A. Farrel, “The application of the path computation element architecture to the determination of a sequence of domains in MPLS and GMPLS,” , Nov. 2012 [Online]. Available: http://www.ietf.org/rfc/rfc6805.txt .

Gerardi, L.

Giorgetti, A.

F. Paolucci, N. Sambo, F. Cugini, A. Giorgetti, and P. Castoldi, “Experimental demonstration of impairment-aware PCE for multi-bit-rate WSONS,” J. Opt. Commun. Netw., vol.  3, no. 8, pp. 610–619, Aug. 2011.
[CrossRef]

A. Giorgetti, F. Cugini, N. Sambo, F. Paolucci, N. Andriolli, and P. Castoldi, “Path state-based update of PCE traffic engineering database in wavelength switched optical networks,” IEEE Commun. Lett., vol.  14, no. 6, pp. 575–577, 2010.
[CrossRef]

F. Paolucci, F. Cugini, A. Giorgetti, N. Sambo, and P. Castoldi, “A survey on the path computation element (PCE) architecture,” IEEE Commun. Surveys Tutorials, to be published.
[CrossRef]

Gopal, R.

L. Yang, R. Dantu, T. Anderson, and R. Gopal, “Forwarding and control element separation (ForCES) framework,” , Apr. 2004 [Online]. Available: http://www.ietf.org/rfc/rfc3746.txt .

Gredler, H.

H. Gredler, J. Medved, S. Previdi, A. Farrel, and S. Ray are preparing a manuscript to be called “North-bound distribution of link-state and TE information using BGP.”

Gunreben, S.

Guo, W.

Y. Wang, Y. Jin, W. Guo, W. Sun, and W. Hu, “Virtualized optical network services across multiple domains for grid applications,” IEEE Commun. Mag., vol.  49, no. 5, pp. 92–101, May 2011.
[CrossRef]

Hu, W.

Y. Wang, Y. Jin, W. Guo, W. Sun, and W. Hu, “Virtualized optical network services across multiple domains for grid applications,” IEEE Commun. Mag., vol.  49, no. 5, pp. 92–101, May 2011.
[CrossRef]

Ikejiri, Y.

J. Vasseur, J. L. Roux, and Y. Ikejiri, “A set of monitoring tools for path computation element (PCE)-based architecture,” , June 2010 [Online]. Available: http://www.ietf.org/rfc/rfc5886.txt .

Jin, Y.

Y. Wang, Y. Jin, W. Guo, W. Sun, and W. Hu, “Virtualized optical network services across multiple domains for grid applications,” IEEE Commun. Mag., vol.  49, no. 5, pp. 92–101, May 2011.
[CrossRef]

King, D.

D. King and A. Farrel, “The application of the path computation element architecture to the determination of a sequence of domains in MPLS and GMPLS,” , Nov. 2012 [Online]. Available: http://www.ietf.org/rfc/rfc6805.txt .

Q. Zhao, D. King, F. Verhaeghe, T. Takeda, Z. Ali, and J. Meuric, “Extensions to the path computation element communication protocol (PCEP) for point-to-multipoint traffic engineering label switched paths,” , Sept. 2010 [Online]. Available: http://www.ietf.org/rfc/rfc6006.txt .

Y. Lee, J. L. Roux, D. King, and E. Oki, “Path computation element communication protocol (PCEP) requirements and protocol extensions in support of global concurrent optimization,” , July 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5557.txt .

Lee, Y.

J. L. Roux, J. Vasseur, and Y. Lee, “Encoding of objective functions in the path computation element communication protocol (PCEP),” , June 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5541.txt .

Y. Lee, J. L. Roux, D. King, and E. Oki, “Path computation element communication protocol (PCEP) requirements and protocol extensions in support of global concurrent optimization,” , July 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5557.txt .

Liu, L.

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “Design and experimental validation of a GMPLS/PCE control plane for elastic CO-OFDM optical networks,” IEEE J. Sel. Areas Commun., vol.  31, no. 1, pp. 49–61, Jan. 2013.

L. Liu, R. Casellas, T. Tsuritani, I. Morita, R. Martínez, and R. Muñoz, “Experimental demonstration of an OpenFlow/PCE integrated control plane for IP over translucent WSON with the assistance of a per-request-based dynamic topology server,” Opt. Express, vol.  21, no. 4, pp. 4183–4193, Feb. 2013.
[CrossRef]

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “GMPLS/PCE control of flexi-grid DWDM optical networks using CO-OFDM transmission [invited],” J. Opt. Commun. Netw., vol.  4, no. 11, pp. B1–B10, Nov. 2012.
[CrossRef]

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, I. Morita, and M. Tsurusawa, “Dynamic virtual link mesh topology aggregation in multi-domain translucent WSON with hierarchical-PCE,” Opt. Express, vol.  19, no. 26, pp. B611–B620, Dec. 2011.
[CrossRef]

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, and I. Morita, “An integrated stateful PCE/OpenFlow controller for the control and management of flexi-grid optical networks,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013.

Martinez, R.

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “Design and experimental validation of a GMPLS/PCE control plane for elastic CO-OFDM optical networks,” IEEE J. Sel. Areas Commun., vol.  31, no. 1, pp. 49–61, Jan. 2013.

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “GMPLS/PCE control of flexi-grid DWDM optical networks using CO-OFDM transmission [invited],” J. Opt. Commun. Netw., vol.  4, no. 11, pp. B1–B10, Nov. 2012.
[CrossRef]

R. Casellas, R. Martinez, R. Muñoz, and S. Gunreben, “Enhanced backwards recursive path computation for multi-area wavelength switched optical networks under wavelength continuity constraint,” J. Opt. Commun. Netw., vol.  1, no. 2, pp. A180–A193, July 2009.
[CrossRef]

R. Martinez, A. Castro, R. Casellas, R. Muñoz, L. Velasco, R. Vilalta, and J. Comellas, “Experimental validation of dynamic restoration in GMPLS-controlled multi-layer networks using PCE-based global concurrent optimization,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013, paper OWG4G.3.

Martínez, R.

L. Liu, R. Casellas, T. Tsuritani, I. Morita, R. Martínez, and R. Muñoz, “Experimental demonstration of an OpenFlow/PCE integrated control plane for IP over translucent WSON with the assistance of a per-request-based dynamic topology server,” Opt. Express, vol.  21, no. 4, pp. 4183–4193, Feb. 2013.
[CrossRef]

R. Vilalta, R. Muñoz, R. Casellas, and R. Martínez, “Dynamic virtual GMPLS-controlled WSON using a resource broker with a VNT manager on the ADRENALINE testbed,” Opt. Express, vol.  20, no. 28, pp. 29149–29154, Dec. 2012.
[CrossRef]

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, I. Morita, and M. Tsurusawa, “Dynamic virtual link mesh topology aggregation in multi-domain translucent WSON with hierarchical-PCE,” Opt. Express, vol.  19, no. 26, pp. B611–B620, Dec. 2011.
[CrossRef]

R. Vilalta, R. Muñoz, R. Casellas, and R. Martínez, “Dynamic wavelength allocation algorithms for on-demand deployment of GMPLS-controlled virtual WSON using a VON resource broker,” in Proc. of the 17th European Conf. on Network and Optical Communications (NOC) and the 7th Conf. on Optical Cabling and Infrastructure (OC&I), Vilanova i la Geltrú, Spain, July 2012.

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, and I. Morita, “An integrated stateful PCE/OpenFlow controller for the control and management of flexi-grid optical networks,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013.

R. Casellas, R. Muñoz, and R. Martínez, “Path computation elements (PCEs): Applications and status (invited paper),” in Optical Fiber Communication Conf. and the Nat. Fiber Optic Engineers Conf., Anaheim, CA, Mar. 2013, paper NTu3F.3.

R. Muñoz, R. Casellas, and R. Martínez, “An open GMPLS-enabled control plane testbed for remote development and experimentation of PCE-based path computation algorithms,” in Proc. of Future Networks and Mobile Summit, Warsaw, Poland, June 2011.

Medved, J.

H. Gredler, J. Medved, S. Previdi, A. Farrel, and S. Ray are preparing a manuscript to be called “North-bound distribution of link-state and TE information using BGP.”

Meloni, G.

Meuric, J.

Q. Zhao, D. King, F. Verhaeghe, T. Takeda, Z. Ali, and J. Meuric, “Extensions to the path computation element communication protocol (PCEP) for point-to-multipoint traffic engineering label switched paths,” , Sept. 2010 [Online]. Available: http://www.ietf.org/rfc/rfc6006.txt .

Moreolo, M. S.

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “Design and experimental validation of a GMPLS/PCE control plane for elastic CO-OFDM optical networks,” IEEE J. Sel. Areas Commun., vol.  31, no. 1, pp. 49–61, Jan. 2013.

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “GMPLS/PCE control of flexi-grid DWDM optical networks using CO-OFDM transmission [invited],” J. Opt. Commun. Netw., vol.  4, no. 11, pp. B1–B10, Nov. 2012.
[CrossRef]

Morita, I.

L. Liu, R. Casellas, T. Tsuritani, I. Morita, R. Martínez, and R. Muñoz, “Experimental demonstration of an OpenFlow/PCE integrated control plane for IP over translucent WSON with the assistance of a per-request-based dynamic topology server,” Opt. Express, vol.  21, no. 4, pp. 4183–4193, Feb. 2013.
[CrossRef]

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “Design and experimental validation of a GMPLS/PCE control plane for elastic CO-OFDM optical networks,” IEEE J. Sel. Areas Commun., vol.  31, no. 1, pp. 49–61, Jan. 2013.

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “GMPLS/PCE control of flexi-grid DWDM optical networks using CO-OFDM transmission [invited],” J. Opt. Commun. Netw., vol.  4, no. 11, pp. B1–B10, Nov. 2012.
[CrossRef]

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, I. Morita, and M. Tsurusawa, “Dynamic virtual link mesh topology aggregation in multi-domain translucent WSON with hierarchical-PCE,” Opt. Express, vol.  19, no. 26, pp. B611–B620, Dec. 2011.
[CrossRef]

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, and I. Morita, “An integrated stateful PCE/OpenFlow controller for the control and management of flexi-grid optical networks,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013.

Muñoz, R.

L. Liu, R. Casellas, T. Tsuritani, I. Morita, R. Martínez, and R. Muñoz, “Experimental demonstration of an OpenFlow/PCE integrated control plane for IP over translucent WSON with the assistance of a per-request-based dynamic topology server,” Opt. Express, vol.  21, no. 4, pp. 4183–4193, Feb. 2013.
[CrossRef]

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “Design and experimental validation of a GMPLS/PCE control plane for elastic CO-OFDM optical networks,” IEEE J. Sel. Areas Commun., vol.  31, no. 1, pp. 49–61, Jan. 2013.

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “GMPLS/PCE control of flexi-grid DWDM optical networks using CO-OFDM transmission [invited],” J. Opt. Commun. Netw., vol.  4, no. 11, pp. B1–B10, Nov. 2012.
[CrossRef]

R. Vilalta, R. Muñoz, R. Casellas, and R. Martínez, “Dynamic virtual GMPLS-controlled WSON using a resource broker with a VNT manager on the ADRENALINE testbed,” Opt. Express, vol.  20, no. 28, pp. 29149–29154, Dec. 2012.
[CrossRef]

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, I. Morita, and M. Tsurusawa, “Dynamic virtual link mesh topology aggregation in multi-domain translucent WSON with hierarchical-PCE,” Opt. Express, vol.  19, no. 26, pp. B611–B620, Dec. 2011.
[CrossRef]

R. Casellas, R. Martinez, R. Muñoz, and S. Gunreben, “Enhanced backwards recursive path computation for multi-area wavelength switched optical networks under wavelength continuity constraint,” J. Opt. Commun. Netw., vol.  1, no. 2, pp. A180–A193, July 2009.
[CrossRef]

R. Martinez, A. Castro, R. Casellas, R. Muñoz, L. Velasco, R. Vilalta, and J. Comellas, “Experimental validation of dynamic restoration in GMPLS-controlled multi-layer networks using PCE-based global concurrent optimization,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013, paper OWG4G.3.

R. Vilalta, R. Muñoz, R. Casellas, and R. Martínez, “Dynamic wavelength allocation algorithms for on-demand deployment of GMPLS-controlled virtual WSON using a VON resource broker,” in Proc. of the 17th European Conf. on Network and Optical Communications (NOC) and the 7th Conf. on Optical Cabling and Infrastructure (OC&I), Vilanova i la Geltrú, Spain, July 2012.

R. Muñoz, R. Casellas, and R. Martínez, “An open GMPLS-enabled control plane testbed for remote development and experimentation of PCE-based path computation algorithms,” in Proc. of Future Networks and Mobile Summit, Warsaw, Poland, June 2011.

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, and I. Morita, “An integrated stateful PCE/OpenFlow controller for the control and management of flexi-grid optical networks,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013.

R. Casellas, R. Muñoz, and R. Martínez, “Path computation elements (PCEs): Applications and status (invited paper),” in Optical Fiber Communication Conf. and the Nat. Fiber Optic Engineers Conf., Anaheim, CA, Mar. 2013, paper NTu3F.3.

Nejabati, R.

R. Nejabati, E. Escalona, S. Peng, and D. Simeonidou, “Optical network virtualization,” in Int. Conf. of Optical Network Design and Modeling (ONDM), 8–10 Feb. 2011.

Oki, E.

E. Oki, T. Takeda, and A. Farrel, “Extensions to the path computation element communication protocol (PCEP) for route exclusions,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5521.txt .

Y. Lee, J. L. Roux, D. King, and E. Oki, “Path computation element communication protocol (PCEP) requirements and protocol extensions in support of global concurrent optimization,” , July 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5557.txt .

Paolucci, F.

F. Cugini, G. Meloni, F. Paolucci, N. Sambo, M. Secondini, L. Gerardi, L. Poti, and P. Castoldi, “Demonstration of flexible optical network based on path computation element,” J. Lightwave Technol., vol.  30, no. 5, pp. 727–733, Mar. 2012.
[CrossRef]

F. Paolucci, N. Sambo, F. Cugini, A. Giorgetti, and P. Castoldi, “Experimental demonstration of impairment-aware PCE for multi-bit-rate WSONS,” J. Opt. Commun. Netw., vol.  3, no. 8, pp. 610–619, Aug. 2011.
[CrossRef]

A. Giorgetti, F. Cugini, N. Sambo, F. Paolucci, N. Andriolli, and P. Castoldi, “Path state-based update of PCE traffic engineering database in wavelength switched optical networks,” IEEE Commun. Lett., vol.  14, no. 6, pp. 575–577, 2010.
[CrossRef]

F. Paolucci, F. Cugini, A. Giorgetti, N. Sambo, and P. Castoldi, “A survey on the path computation element (PCE) architecture,” IEEE Commun. Surveys Tutorials, to be published.
[CrossRef]

Peng, S.

R. Nejabati, E. Escalona, S. Peng, and D. Simeonidou, “Optical network virtualization,” in Int. Conf. of Optical Network Design and Modeling (ONDM), 8–10 Feb. 2011.

Poti, L.

Previdi, S.

H. Gredler, J. Medved, S. Previdi, A. Farrel, and S. Ray are preparing a manuscript to be called “North-bound distribution of link-state and TE information using BGP.”

Ray, S.

H. Gredler, J. Medved, S. Previdi, A. Farrel, and S. Ray are preparing a manuscript to be called “North-bound distribution of link-state and TE information using BGP.”

Roux, J. L.

J. Vasseur, J. L. Roux, and Y. Ikejiri, “A set of monitoring tools for path computation element (PCE)-based architecture,” , June 2010 [Online]. Available: http://www.ietf.org/rfc/rfc5886.txt .

J. Ash and J. L. Roux, “Path computation element (PCE) communication protocol generic requirements,” , Sept. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4657.txt .

Y. Lee, J. L. Roux, D. King, and E. Oki, “Path computation element communication protocol (PCEP) requirements and protocol extensions in support of global concurrent optimization,” , July 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5557.txt .

J. L. Roux, J. Vasseur, and Y. Lee, “Encoding of objective functions in the path computation element communication protocol (PCEP),” , June 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5541.txt .

J. Vasseur and J. L. Roux, “Path computation element (PCE) communication protocol (PCEP),” , Mar. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5440.txt .

J. L. Roux, “Requirements for path computation element (PCE) discovery,” , Oct. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4674.txt .

J. Vasseur, R. Zhang, N. Bitar, and J. L. Roux, “A backward-recursive PCE-based computation (BRPC) procedure to compute shortest constrained inter-domain traffic engineering label switched paths,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5441.txt .

Sambo, N.

F. Cugini, G. Meloni, F. Paolucci, N. Sambo, M. Secondini, L. Gerardi, L. Poti, and P. Castoldi, “Demonstration of flexible optical network based on path computation element,” J. Lightwave Technol., vol.  30, no. 5, pp. 727–733, Mar. 2012.
[CrossRef]

F. Paolucci, N. Sambo, F. Cugini, A. Giorgetti, and P. Castoldi, “Experimental demonstration of impairment-aware PCE for multi-bit-rate WSONS,” J. Opt. Commun. Netw., vol.  3, no. 8, pp. 610–619, Aug. 2011.
[CrossRef]

A. Giorgetti, F. Cugini, N. Sambo, F. Paolucci, N. Andriolli, and P. Castoldi, “Path state-based update of PCE traffic engineering database in wavelength switched optical networks,” IEEE Commun. Lett., vol.  14, no. 6, pp. 575–577, 2010.
[CrossRef]

F. Paolucci, F. Cugini, A. Giorgetti, N. Sambo, and P. Castoldi, “A survey on the path computation element (PCE) architecture,” IEEE Commun. Surveys Tutorials, to be published.
[CrossRef]

Secondini, M.

Seedorf, J.

J. Seedorf and E. Burger, “Application-layer traffic optimization (ALTO) problem statement,” , Oct. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5693.txt .

Simeonidou, D.

R. Nejabati, E. Escalona, S. Peng, and D. Simeonidou, “Optical network virtualization,” in Int. Conf. of Optical Network Design and Modeling (ONDM), 8–10 Feb. 2011.

Sun, W.

Y. Wang, Y. Jin, W. Guo, W. Sun, and W. Hu, “Virtualized optical network services across multiple domains for grid applications,” IEEE Commun. Mag., vol.  49, no. 5, pp. 92–101, May 2011.
[CrossRef]

Takeda, T.

E. Oki, T. Takeda, and A. Farrel, “Extensions to the path computation element communication protocol (PCEP) for route exclusions,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5521.txt .

Q. Zhao, D. King, F. Verhaeghe, T. Takeda, Z. Ali, and J. Meuric, “Extensions to the path computation element communication protocol (PCEP) for point-to-multipoint traffic engineering label switched paths,” , Sept. 2010 [Online]. Available: http://www.ietf.org/rfc/rfc6006.txt .

Tsuritani, T.

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “Design and experimental validation of a GMPLS/PCE control plane for elastic CO-OFDM optical networks,” IEEE J. Sel. Areas Commun., vol.  31, no. 1, pp. 49–61, Jan. 2013.

L. Liu, R. Casellas, T. Tsuritani, I. Morita, R. Martínez, and R. Muñoz, “Experimental demonstration of an OpenFlow/PCE integrated control plane for IP over translucent WSON with the assistance of a per-request-based dynamic topology server,” Opt. Express, vol.  21, no. 4, pp. 4183–4193, Feb. 2013.
[CrossRef]

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “GMPLS/PCE control of flexi-grid DWDM optical networks using CO-OFDM transmission [invited],” J. Opt. Commun. Netw., vol.  4, no. 11, pp. B1–B10, Nov. 2012.
[CrossRef]

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, I. Morita, and M. Tsurusawa, “Dynamic virtual link mesh topology aggregation in multi-domain translucent WSON with hierarchical-PCE,” Opt. Express, vol.  19, no. 26, pp. B611–B620, Dec. 2011.
[CrossRef]

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, and I. Morita, “An integrated stateful PCE/OpenFlow controller for the control and management of flexi-grid optical networks,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013.

Tsurusawa, M.

Vasseur, J.

J. Vasseur, R. Zhang, N. Bitar, and J. L. Roux, “A backward-recursive PCE-based computation (BRPC) procedure to compute shortest constrained inter-domain traffic engineering label switched paths,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5441.txt .

J. Vasseur and J. L. Roux, “Path computation element (PCE) communication protocol (PCEP),” , Mar. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5440.txt .

J. Vasseur, A. Ayyangar, and R. Zhang, “A per-domain path computation method for establishing inter-domain traffic engineering (TE) label switched paths (LSPs),” , Feb. 2008 [Online]. Available: http://www.ietf.org/rfc/rfc5152.txt .

R. Bradford, J. Vasseur, and A. Farrel, “Preserving topology confidentiality in inter-domain path computation using a path-key-based mechanism,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5520.txt .

J. Vasseur, J. L. Roux, and Y. Ikejiri, “A set of monitoring tools for path computation element (PCE)-based architecture,” , June 2010 [Online]. Available: http://www.ietf.org/rfc/rfc5886.txt .

J. L. Roux, J. Vasseur, and Y. Lee, “Encoding of objective functions in the path computation element communication protocol (PCEP),” , June 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5541.txt .

Vasseur, J.-P.

A. Farrel, J.-P. Vasseur, and J. Ash, “A path computation element (PCE)-based architecture,” , Aug. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4655.txt .

A. Farrel, J.-P. Vasseur, and A. Ayyangar, “A framework for inter-domain multiprotocol label switching traffic engineering,” , Nov. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4726.txt .

Velasco, L.

R. Martinez, A. Castro, R. Casellas, R. Muñoz, L. Velasco, R. Vilalta, and J. Comellas, “Experimental validation of dynamic restoration in GMPLS-controlled multi-layer networks using PCE-based global concurrent optimization,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013, paper OWG4G.3.

Verhaeghe, F.

Q. Zhao, D. King, F. Verhaeghe, T. Takeda, Z. Ali, and J. Meuric, “Extensions to the path computation element communication protocol (PCEP) for point-to-multipoint traffic engineering label switched paths,” , Sept. 2010 [Online]. Available: http://www.ietf.org/rfc/rfc6006.txt .

Vilalta, R.

R. Vilalta, R. Muñoz, R. Casellas, and R. Martínez, “Dynamic virtual GMPLS-controlled WSON using a resource broker with a VNT manager on the ADRENALINE testbed,” Opt. Express, vol.  20, no. 28, pp. 29149–29154, Dec. 2012.
[CrossRef]

R. Martinez, A. Castro, R. Casellas, R. Muñoz, L. Velasco, R. Vilalta, and J. Comellas, “Experimental validation of dynamic restoration in GMPLS-controlled multi-layer networks using PCE-based global concurrent optimization,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013, paper OWG4G.3.

R. Vilalta, R. Muñoz, R. Casellas, and R. Martínez, “Dynamic wavelength allocation algorithms for on-demand deployment of GMPLS-controlled virtual WSON using a VON resource broker,” in Proc. of the 17th European Conf. on Network and Optical Communications (NOC) and the 7th Conf. on Optical Cabling and Infrastructure (OC&I), Vilanova i la Geltrú, Spain, July 2012.

Wang, Y.

Y. Wang, Y. Jin, W. Guo, W. Sun, and W. Hu, “Virtualized optical network services across multiple domains for grid applications,” IEEE Commun. Mag., vol.  49, no. 5, pp. 92–101, May 2011.
[CrossRef]

Yang, L.

L. Yang, R. Dantu, T. Anderson, and R. Gopal, “Forwarding and control element separation (ForCES) framework,” , Apr. 2004 [Online]. Available: http://www.ietf.org/rfc/rfc3746.txt .

Zhang, R.

J. Vasseur, A. Ayyangar, and R. Zhang, “A per-domain path computation method for establishing inter-domain traffic engineering (TE) label switched paths (LSPs),” , Feb. 2008 [Online]. Available: http://www.ietf.org/rfc/rfc5152.txt .

J. Vasseur, R. Zhang, N. Bitar, and J. L. Roux, “A backward-recursive PCE-based computation (BRPC) procedure to compute shortest constrained inter-domain traffic engineering label switched paths,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5441.txt .

Zhao, Q.

Q. Zhao, D. King, F. Verhaeghe, T. Takeda, Z. Ali, and J. Meuric, “Extensions to the path computation element communication protocol (PCEP) for point-to-multipoint traffic engineering label switched paths,” , Sept. 2010 [Online]. Available: http://www.ietf.org/rfc/rfc6006.txt .

IEEE Commun. Lett. (1)

A. Giorgetti, F. Cugini, N. Sambo, F. Paolucci, N. Andriolli, and P. Castoldi, “Path state-based update of PCE traffic engineering database in wavelength switched optical networks,” IEEE Commun. Lett., vol.  14, no. 6, pp. 575–577, 2010.
[CrossRef]

IEEE Commun. Mag. (1)

Y. Wang, Y. Jin, W. Guo, W. Sun, and W. Hu, “Virtualized optical network services across multiple domains for grid applications,” IEEE Commun. Mag., vol.  49, no. 5, pp. 92–101, May 2011.
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IEEE J. Sel. Areas Commun. (1)

R. Casellas, R. Muñoz, J. M. Fabrega, M. S. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, “Design and experimental validation of a GMPLS/PCE control plane for elastic CO-OFDM optical networks,” IEEE J. Sel. Areas Commun., vol.  31, no. 1, pp. 49–61, Jan. 2013.

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J. Opt. Commun. Netw. (3)

Opt. Express (3)

Other (36)

A. Farrel, J.-P. Vasseur, and A. Ayyangar, “A framework for inter-domain multiprotocol label switching traffic engineering,” , Nov. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4726.txt .

D. King, J. Meuric, O. Dugeon, Q. Zhao, and O. Gonzalez de Dios, “Applicability of the path computation element to inter-area and inter-AS MPLS and GMPLS traffic engineering,” IETF Internet Draft, Feb. 2013 [Online]. Available: http://tools.ietf.org/html/draft-ietf-pce-inter-area-as-applicability-03 .

J. Vasseur, A. Ayyangar, and R. Zhang, “A per-domain path computation method for establishing inter-domain traffic engineering (TE) label switched paths (LSPs),” , Feb. 2008 [Online]. Available: http://www.ietf.org/rfc/rfc5152.txt .

J. Vasseur, R. Zhang, N. Bitar, and J. L. Roux, “A backward-recursive PCE-based computation (BRPC) procedure to compute shortest constrained inter-domain traffic engineering label switched paths,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5441.txt .

A. Farrel, J.-P. Vasseur, and J. Ash, “A path computation element (PCE)-based architecture,” , Aug. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4655.txt .

R. Vilalta, R. Muñoz, R. Casellas, and R. Martínez, “Dynamic wavelength allocation algorithms for on-demand deployment of GMPLS-controlled virtual WSON using a VON resource broker,” in Proc. of the 17th European Conf. on Network and Optical Communications (NOC) and the 7th Conf. on Optical Cabling and Infrastructure (OC&I), Vilanova i la Geltrú, Spain, July 2012.

“OpenFlow protocol specification v1.0,” Open Networking Foundation, 2009 [Online]. Available: http://www.opennetworking.org .

D. King and A. Farrel, “A PCE-based architecture for application-based network operations,” IETF Internet Draft, Feb. 2013, [Online]. Available: http://tools.ietf.org/html/draft-farrkingel-pce-abno-architecture-03 .

R. Muñoz, R. Casellas, and R. Martínez, “An open GMPLS-enabled control plane testbed for remote development and experimentation of PCE-based path computation algorithms,” in Proc. of Future Networks and Mobile Summit, Warsaw, Poland, June 2011.

“OFELIA: Openflow in Europe Linking Infrastructure and Applications,” 2012 [Online]. Available: http://www.fp7-ofelia.eu/ .

R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, and I. Morita, “An integrated stateful PCE/OpenFlow controller for the control and management of flexi-grid optical networks,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013.

J. Ash and J. L. Roux, “Path computation element (PCE) communication protocol generic requirements,” , Sept. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4657.txt .

J. L. Roux, “Requirements for path computation element (PCE) discovery,” , Oct. 2006 [Online]. Available: http://www.ietf.org/rfc/rfc4674.txt .

E. Oki, T. Takeda, and A. Farrel, “Extensions to the path computation element communication protocol (PCEP) for route exclusions,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5521.txt .

J. L. Roux, J. Vasseur, and Y. Lee, “Encoding of objective functions in the path computation element communication protocol (PCEP),” , June 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5541.txt .

Q. Zhao, D. King, F. Verhaeghe, T. Takeda, Z. Ali, and J. Meuric, “Extensions to the path computation element communication protocol (PCEP) for point-to-multipoint traffic engineering label switched paths,” , Sept. 2010 [Online]. Available: http://www.ietf.org/rfc/rfc6006.txt .

J. Seedorf and E. Burger, “Application-layer traffic optimization (ALTO) problem statement,” , Oct. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5693.txt .

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J. Vasseur and J. L. Roux, “Path computation element (PCE) communication protocol (PCEP),” , Mar. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5440.txt .

R. Casellas, R. Muñoz, and R. Martínez, “Path computation elements (PCEs): Applications and status (invited paper),” in Optical Fiber Communication Conf. and the Nat. Fiber Optic Engineers Conf., Anaheim, CA, Mar. 2013, paper NTu3F.3.

F. Paolucci, F. Cugini, A. Giorgetti, N. Sambo, and P. Castoldi, “A survey on the path computation element (PCE) architecture,” IEEE Commun. Surveys Tutorials, to be published.
[CrossRef]

“Spectral grids for WDM applications: DWDM frequency grid,” , Feb.2012.

“Architecture of optical transport networks,” , Oct. 2012.

“Unified functional architecture of transport networks,” , Oct. 2012.

D. King and A. Farrel, “The application of the path computation element architecture to the determination of a sequence of domains in MPLS and GMPLS,” , Nov. 2012 [Online]. Available: http://www.ietf.org/rfc/rfc6805.txt .

R. Bradford, J. Vasseur, and A. Farrel, “Preserving topology confidentiality in inter-domain path computation using a path-key-based mechanism,” , Apr. 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5520.txt .

“The STRONGEST Project (Scalable, Tunable and Resilient Optical Networks Guaranteeing Extremely-high Speed Transport),” 2012. [Online]. Available: http://www.ict-strongest.eu/ .

“Interworking between MAINS and STRONGEST,” demo presented at the Workshop on Control Plane Architectures, European Conference on Optical Communications (ECOC), 2012.

“Experimental validation of STRONGEST network prototypes: Results and analysis,” , Jan. 2013 [Online]. Available: http://www.ict-strongest.eu/upload-files/deliverables-2/deliverable-d44-53/download .

Y. Lee, J. L. Roux, D. King, and E. Oki, “Path computation element communication protocol (PCEP) requirements and protocol extensions in support of global concurrent optimization,” , July 2009 [Online]. Available: http://www.ietf.org/rfc/rfc5557.txt .

R. Martinez, A. Castro, R. Casellas, R. Muñoz, L. Velasco, R. Vilalta, and J. Comellas, “Experimental validation of dynamic restoration in GMPLS-controlled multi-layer networks using PCE-based global concurrent optimization,” in Optical Fiber Communication Conf. and Expo. and the Nat. Fiber Optic Engineers Conf. (OFC/NFOEC), Anaheim, CA, Mar. 2013, paper OWG4G.3.

“Final report on WP3 activity and performance analysis,” , Dec. 2012 [Online]. Available: http://www.ict-strongest.eu/upload-files/deliverables-2/deliverable-d3-4-48 .

J. Vasseur, J. L. Roux, and Y. Ikejiri, “A set of monitoring tools for path computation element (PCE)-based architecture,” , June 2010 [Online]. Available: http://www.ietf.org/rfc/rfc5886.txt .

E. Crabbe, J. Medved, I. Minei, and R. Varga, “PCEP extensions for stateful PCE,” IETF Internet Draft, Mar. 2013 [Online]. Available: http://tools.ietf.org/html/draft-ietf-pce-stateful-pce-03 .

R. Nejabati, E. Escalona, S. Peng, and D. Simeonidou, “Optical network virtualization,” in Int. Conf. of Optical Network Design and Modeling (ONDM), 8–10 Feb. 2011.

H. Gredler, J. Medved, S. Previdi, A. Farrel, and S. Ray are preparing a manuscript to be called “North-bound distribution of link-state and TE information using BGP.”

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Figures (8)

Fig. 1.
Fig. 1.

Example of multidomain path computation in which a PCE requests a neighboring PCE to perform a path computation for a given segment. The leftmost PCE requests the segment C–D to the rightmost PCE to return the full path A–D to the PCC.

Fig. 2.
Fig. 2.

Hierarchical PCE (H-PCE) as proposed architecture for multidomain path computation.

Fig. 3.
Fig. 3.

STRONGEST-MAINS demo showing the application of H-PCE to a multidomain and multitechnology setup in a multipartner testbed composed of WSON domains and optical burst switching (OBS) domains. Testbed interconnection of TID, CTTC (Spain), NSN-DE (Germany), Nextworks, and CNIT (Italy).

Fig. 4.
Fig. 4.

Example of the FBA showing the role of the front-end PCE (f-PCE) in the selection of the back-end PCEs (b-PCEs) and the final response.

Fig. 5.
Fig. 5.

VON resource broker system architecture.

Fig. 6.
Fig. 6.

Implemented PCE appliance block diagram with main components.

Fig. 7.
Fig. 7.

System with web-based interface for the remote uploading of PCE algorithms and testbed management.

Fig. 8.
Fig. 8.

Block diagram of the integrated stateful PCE and OpenFlow controller.