Abstract
Link recovery in high-speed four-fiber networks can be achieved using
dynamic searches, covers of rings, or generalized loopback. We present a
method to provide link recovery for all links in a network without using all
links for backup traffic transmission. The method extends generalized loopback
to operate on a subgraph of the full backup graph. The backup capacity on such
links can then be used to carry unprotected traffic, i.e., traffic that is not
recovered in case of a failure, while primary fibers on the links retain
failure protection. Although all primary fibers remain fully robust to
single-link failures, reserving links for unprotected traffic reduces a
network's ability to recover from multiple failures. We explore the tradeoff
between capacity and robustness to two-link failures for several typical
high-speed optical fiber networks, comparing the properties of three
fink-restoration algorithms based on generalized loopback with the properties
of covers of rings. Our results demonstrate robustness comparable or superior
to that available with covers of rings while providing an additional
unprotected traffic capacity of roughly 20% of the network's primary
capacity.
© 2000 IEEE
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