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Proceedings Paper

Hybrid centralized pre-computing/local distributed optimization of shared disjoint-backup path approach to GMPLS optical mesh network intelligent restoration
Author(s): Qian Gong; Rong Xu; Jintong Lin
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Paper Abstract

Wavelength Division Multiplexed (WDM) networks that route optical connections using intelligent optical cross-connects (OXCs) is firmly established as the core constituent of next generation networks. Rapid failure recovery is fundamental to building reliable transport networks. Mesh restoration promises cost effective failure recovery compared with legacy ring networks, and is now seeing large-scale deployment. Many carriers are migrating away from SONET ring restoration for their core transport networks and replacing it with mesh restoration through “intelligent” O-E-O cross-connects (XC). The mesh restoration is typically provided via two fiber-disjoint paths: a service path and a restoration path. this scheme can restore any single link failure or node failure. And by used shared mesh restoration, although every service route is assigned a restoration route, no dedicated capacity needs to be reserved for the restoration route, resulting in capacity savings. The restoration approach we propose is Centralized Pre-computing, Local Distributed Optimization, and Shared Disjoint-backup Path. This approach combines the merits of centralized and distributed solutions. It avoids the scalability issues of centralized solutions by using a distributed control plane for disjoint service path computation and restoration path provisioning. Moreover, if the service routes of two demands are disjoint, no single failure will affect both demands simultaneously. This means that the restoration routes of these two demands can share link capacities, because these two routes will not be activated at the same time. So we can say, this restoration capacity sharing approach achieves low restoration capacity and fast restoration speed, while requiring few control plane changes.

Paper Details

Date Published: 15 April 2004
PDF: 8 pages
Proc. SPIE 5282, Network Architectures, Management, and Applications, (15 April 2004); doi: 10.1117/12.523680
Show Author Affiliations
Qian Gong, Beijing Univ. of Posts and Telecommunications (China)
Rong Xu, Beijing Univ. of Posts and Telecommunications (China)
Jintong Lin, Beijing Univ. of Posts and Telecommunications (China)

Published in SPIE Proceedings Vol. 5282:
Network Architectures, Management, and Applications
S. J. Ben Yoo; Kwok-wai Cheung; Yun-Chur Chung; Guangcheng Li, Editor(s)

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