DocumentCode :
2961653
Title :
Utilization of temporary reservation of path computed resources for multi-domain path computation element protocols in WDM networks
Author :
Álvarez, Diego ; López, Víctor ; Namuro, José Luis A ; De Vergara, Jorge López ; De Dios, Óscar González ; Aracil, Javier
Author_Institution :
High Performance Comput. & Networking Group, Univ. Autonoma de Madrid, Madrid, Spain
fYear :
2011
fDate :
28-30 Nov. 2011
Firstpage :
102
Lastpage :
106
Abstract :
In recent years, Path Computation Element (PCE) architecture has been standardized as a suitable solution for path computation in multi-domain network scenarios. The Traffic Engineering Database (TED) of the PCE is updated with the information of the control plane. However, there is a delay from the PCE replies to a request, until the TED is updated with the network status information. This delay includes not only the control plane delay, but also Path Computation Element Protocol (PCEP) information exchange. This desynchronization in the TED and the real status information leads to an extra blocking situation when the Label Switch Router (LSR) tries to reserve a path, but it has been previously reserved by other LSR. To solve such problem, a recent draft is submitted to the IETF proposing new PCEP extensions for a pre-reservation of the computed path resources for a certain period. This work implements in C three multi-domain algorithms: Per-domain Path Computation, Backward-Recursive PCE-based Computation and Hierarchical Path Computation Element and it assesses their performance with and without mechanisms to reduce this extra blocking probability due to the uncertainty of the TED information.
Keywords :
protocols; telecommunication traffic; telephony; wavelength division multiplexing; D3TF; TED information; WDM network; backward-recursive PCE-based computation; control plane; extra blocking probability; hierarchical path computation element; label switch router; multidomain network scenario; multidomain path computation element protocol; network status information; path computation element protocol information exchange; path computed resource; per-domain path computation; real status information; temporary reservation; three multidomain algorithm; traffic engineering database; Computer architecture; Delay; Optical fiber networks; Optical noise; Optical switches; Protocols; Signal to noise ratio;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Network of the Future (NOF), 2011 International Conference on the
Conference_Location :
Paris
Print_ISBN :
978-1-4577-1605-8
Type :
conf
DOI :
10.1109/NOF.2011.6126666
Filename :
6126666
Link To Document :
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