Modeling and Calculation for Network System Survivability

Survivability is the ability of a system to continue operating despite the presence of abnormal events such as failures and intrusions. This paper presents a quantitative model of spare resource limited survivability (SRLSQM), based on the definition and four characteristic attributes of network survivability. The executing process of SRLSQM is also illustrated and then the calculating formulas are proposed which include the calculation of restoration rate and system state transition matrixes. The formulas reflect the survivability requirements in network spare resources. At last, a simulation testing is carried through, which demonstrates the feasibility and reliability of our model.