In this paper, the definition of the degree of network damage is subjective due to the lack of a large amount of data related to the disaster damage on the network.
Since the communication network are very complex, it is hard to design an ideal criterion suitable for all kinds of network.
A five-scale degree of network damage is developed to indicate the impact of disaster events on network.
We combine two network metrics to determine the degree of network damage from the perspective of an ISP.
The degree of network damage provide a general framework for the network operators to assess many network failure scenarios, ranging from the single-link failures to catastrophic events.
In this paper, we focus on a practical problem of providing an uniform criterion for accessing the impact of disasters on the networks.
These early academic research works 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.