Abstract
Ethernet Ring Protection (ERP) has recently emerged to provide protection
switching for Ethernet ring topologies with sub-50 ms failover capabilities.
ERP's promise to provide protection in mesh packet transport networks positions
Ethernet as a prominent competitor to conventional SONET/SDH and as the technology
of choice for carrier networks. Higher service availability, however, in ERP
has been challenged by the issue of network partitioning and contention for
shared capacity caused by concurrent failures. In this paper, we show that
in a network designed to withstand single-link failure, the service availability,
in the presence of double link failures, depends on the designed ERP scheme,
i.e., the RPL placement as well as the selection of ring hierarchy. Therefore,
we present a study for characterizing service outages and propose a design
method which strikes a balance between capacity requirement and service availability
(i.e., the number of service outages resulting from concurrent failures).
We observe that through effective design, remarkable reduction in service
outages is obtained at a modest increase in capacity deployment.
© 2012 IEEE
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