The notion of service level agreement (SLA) has been proposed to capture qualitatively and quantitatively defined performance contract between the service provider and the customers.Connection reliability and restoration time are two important SLA-parameters of the customers' main concerns and should be carefully considered in survivable WDM networks.A sound scheme should carefully guarantee the two SLA-requirements simultaneously and benefit a network operator in resource efficiency and service scalability.Under the two SLA-parameter constraints

a novel dynamic constraint shared path-protection algorithm (DCSP) in WDM mesh networks is proposed.Based on the basic ideas of the K-shortest path and partial link-disjoint protection

DCSP can provide differentiated services for customers according to their SLA-parameters.Simulation results show that DCSP not only can efficiently guarantee the specific SLA requirements of customers

but also can achieve significant performance gain and lead to remarkable reduction in blocking probability.