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The interface between IP and WDM and its effect on the cost of survivability

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2 Author(s)
Sasaki, G.H. ; Dept. of Electr. Eng., Hawaii Univ., Honolulu, HI, USA ; Ching-Fong Su

A summary of research on survivable IP networks overlaid over WDM networks is presented. The WDM networks are part of optical transport service providers, who lease lightpath services to institutions with IP networks. The lightpath services realize IP links for IP networks, and they have different protection grades such as unprotected and protected. The research included considering new network survivability requirements and incorporating them into network design problems. The cost of survivable IP over WDM networks is compared over three scenarios. Each succeeding scenario has the WDM network provide more flexible services, and the IP and WDM networks become more integrated. We consider the problem of setting up lightpaths for an IP network so that the network will remain connected after a fiber link fault. Algorithms to find the lightpaths and minimize cost are given. The network costs under the three scenarios are compared by simulations.

Published in:

Communications Magazine, IEEE  (Volume:41 ,  Issue: 1 )

Date of Publication:

Jan 2003

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