Abstract
Optical networks are vulnerable to failures due to targeted attacks or large-scale disasters. The recoverability of optical networks refers to the ability of an optical network to return to a desired performance level after suffering topological perturbations such as link failures. This paper proposes a general topological approach and recoverability indicators to measure the network recoverability for optical networks for two recovery scenarios: 1) only the links which are damaged in the failure process can be recovered and 2) links can be established between any pair of nodes that have no link between them after the failure process. We use the robustness envelopes of realizations and the histograms of two recoverability indicators to illustrate the impact of the random failure and recovery processes on the network performance. By applying the average two-terminal reliability and the network efficiency as robustness metrics, we employ the proposed approach to assess 20 real-world optical networks. Numerical results validate that the network recoverability is coupled to the network topology, the robustness metric and the recovery strategy. We further show that a greedy recovery strategy could provide a near-optimal recovery performance for the robustness metrics. We investigate the sensitivity of network recoverability and find that the sensitivity of the recoverability indicators varies according to different robustness metrics and scenarios. We also find that assortativity has the strongest correlation with both recoverability indicators.
Highlights
High reliability and robustness in optical network backbones play an important role in successfully provisioning high service availability of the Internet and communication systems [1]
This paper proposes a general topological approach and recov erability indicators to measure the network recoverability for optical networks for two recovery scenarios: 1) only the links which are damaged in the failure process can be recovered and 2) links can be established between any pair of nodes that have no link between them after the failure process
We investigate the sensitivity of network recoverability and find that the sensitivity of the recoverability indicators varies according to different robustness metrics and scenarios
Summary
High reliability and robustness in optical network backbones play an important role in successfully provisioning high service availability of the Internet and communication systems [1]. Disaster-based failures and damages to optical fiber cables can partially overload data delivery, resulting in unavailability of communication services [2]. Recovery measures are taken in order to recover the function or performance of the optical network after the failure process, either by restoring the damaged links or by building new links. Our approach is tested on 20 real-world optical net works, and we verify that the proposed recoverability indicators allow us to compare the performance of different recovery strategies and assess the recoverability of different networks. The rest of this paper is organized as follows: Section 2 introduces the topological approach for measuring the network recoverability for the two considered recovery scenarios.
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