Abstract
In shared mesh restoration, a distributed signaling protocol is used to
reroute connections from failed service paths to restoration paths upon failure
events. However, even when the network contains sufficient capacity, the restoration
paths could be blocked for two different reasons: (1) with distributed
restoration-path selection schemes, multiple restoration paths may compete for the
capacity of the same logical links, even when other logical links have sufficient
capacity; (2) multiple restoration-path setup attempts may compete for the same
channels within the logical link (the glare problem), even when sufficient capacity
is available within the logical link. We propose a hybrid distributed-centralized
restoration mechanism for restoration-path selection and a channel-selection scheme
that eliminates almost all glares. As shown from simulation in a typical intercity
backbone network, our proposed hybrid mechanism improves the first restoration
attempt success ratio by 40% compared with a pure distributed restoration approach.
In addition, the proposed restoration-path selection algorithm saves up to 50% of
restoration capacity compared with the disjoint shortest-path algorithm and 15%
compared with a previously published greedy algorithm.
© 2003 Optical Society of America
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