Broadband

Cross-Layer Survivability in WDM-Based Networks

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Executive Summary

In layered networks, a single failure at a lower layer may cause multiple failures in the upper layers. As a result, traditional schemes that protect against single failures may not be effective in cross-layer networks. In this paper, the authors introduce the problem of maximizing the connectivity of layered networks. They show that connectivity metrics in layered networks have significantly different meaning than their single-layer counterparts. Results that are fundamental to survivable single-layer network design, such as the Max-Flow Min-Cut theorem, are no longer applicable to the layered setting. They propose new metrics to measure connectivity in layered networks and analyze their properties.

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