Abstract
Feature Issue on
Availability
Protection of communication against network failures is
becoming increasingly important, and here we present what we believe to be the most
capacity-efficient protection method possible, the complete rerouting protection method,
when we require that all communication should be restored in the case of a single link
network failure. We present a linear programming model of the protection method and a
column-generation algorithm. For six real-world networks, the minimal restoration
overbuild network capacity is between 13% and 78%. We further study the importance of
the density of the network, derive analytical bounds, and study methods to speed up the
column-generation algorithm. We expect that the suggested protection method will be used
for calculating lower bounds required for protection, but not as a functioning
protection method.
© 2006 Optical Society of America
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