These early academic research work mainly focus on the specified metrics which can not satisfy the network operator's requirements.
Besides,it also lacks of a general rule to model and evaluate the impact of most disaster events.
The industry has achieved widespread awareness of disaster recovery and other business continuity issues after the terrorist attacks of Sept.
11 2001 and the communication loss during recent earthquakes.
Disaster plans of communication and computer network are made for the worst situations to ensure network continuity and minimize the interruption of business process.
The disaster plan includes how to improve fault tolerance by investing more in network and power infrastructure and how to respond to various disaster scenarios.
Many factors need to be considered such as facilities,data copy,custom experience,and even emergency communication.
However,since it is hard for the network operators to quantify the network survivability due to the lack of unified norms and methods to reflect the disaster's impact on physical network,such actions can be performed only at a slow time-scale and lack of Service Level Agreement (SLA) guarantees for both ISP operators,network maintainers and customers.