Abstract
A resource-efficient provisioning framework (RPF) is proposed in this
paper for optical networks providing dedicated path protection (DPP) and shared
path protection (SPP) services. The framework reduces resource consumption
by considering spare capacity reservation of DPP and SPP cooperatively while
provides 100% survivability guarantee and maintains the recovery time for
both protection types against the predominant single link failures. To tackle
the service provisioning problem under the framework, an integer linear programming
(ILP) formulation is presented to find the optimal routing solution for a
given set of traffic demands. The objective is to minimize total capacities
consumed by working and backup paths of all demands. Then, heuristics are
developed for on-line routing under dynamic change of traffic. Numerical results
show that compared with traditional provisioning framework (TPF), the RPF
has the following advantages: 1) Over 10% capacity savings are achieved for
static service provisioning; 2) blocking probability of both protection types
is greatly reduced; 3) lower resource overbuild is achieved; and 4) average
backup-path hop distance of shared-path-protected flows is reduced. Finally,
network survivability in face of double link failures is discussed under the
framework.
© 2008 IEEE
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