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Proceedings Paper

Quality-of-service-based protection in MPLS control WDM mesh networks
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Paper Abstract

Intelligent methods for automatic protection and restoration are critical in optical transport mesh networks. This paper discusses the problem of quality of service (QoS)-based protection in term of the protection-switching time and availability for end-to-end lightpaths in a WDM mesh network. We analyze the backup lightpath-sharing problem in such networks and study the correlation of the working lightpaths and its impact to the sharing of their backup lightpaths. We present a multi-protocol-label-switching (MPLS) control-based fully distributed algorithm to solve the protection problem. The proposed algorithm includes intelligent and fully automatic procedures to set up, take down, activate, restore, and manage backup lightpaths. It greatly reduces the required resources for protection by allowing the sharing of network resources by multiple backup lightpaths. At the same time, it guarantees, if possible, to satisfy the availability requirement even with resource sharing by taking the correlation of working lightpaths into consideration when deciding backup lightpaths. A simple analysis of the proposed algorithm in terms of computation, time, and message complexity indicates that the implementation of the algorithm is practical. The illustrative studies that compare the performance of 1:1, unlimited sharing, and QoS-based sharing backup algorithms indicates that QoS-based sharing achieves comparable performance as unlimited sharing, which is much better than the 1:1 backup scheme in terms of connection blocking probability, average number of connections in the network for a given offered load, and network-resource utilization.

Paper Details

Date Published: 17 October 2001
PDF: 11 pages
Proc. SPIE 4585, Optical Networking, (17 October 2001); doi: 10.1117/12.445179
Show Author Affiliations
Wushao Wen, Univ. of California/Davis (United States)
Biswanath Mukherjee, Univ. of California/Davis (United States)
S. J. Ben Yoo, Univ. of California/Davis (United States)

Published in SPIE Proceedings Vol. 4585:
Optical Networking
Chunming Qiao; Shizhong Xie, Editor(s)

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