Survivability: Wavelength Recovery for Node and Link Failure in All Optical Networks

Abstract

Survivability is a critical network design issue in today's all optical networks. Its objective is to restore the traffic affected by a failure at the network level with little or minimal loss and delay. In a multilayer network environment, this problem becomes more complex since a physical failure may generate multiple failures in different network layers. Optical networks (e.g. SDH) have been studied for several years and protection technique standards for such networks have been developed. Multi-layer survivability techniques promise to overcome this problem by integrating the survivability techniques provided in the different network layers. This article takes a look at the techniques used to achieve survivability in traditional optical networks, and to a certain extent how those techniques are extendable to present day optical burst switching (OBS). It further proposes a survivability implementation strategy for a mesh topology network .

Managing resilience in carrier grade networks: Survey, open issues and trends

“…4b. In this scenario a failure on the optical link c − d pops up, affecting both virtual links B − D and C − D, since the optical link c − d is the server link for both virtual links -the traffic on the links B − D and C − D is sent along the optical link c − d. In this scenario, the SLR recovery strategy implemented at [62], [67], [68], [69], [64], [70], [71], [72] the IP layer cannot correctly restore the affected traffic since, nowadays, the IP layer cannot trigger the provisioning of an optical circuit due to cross-layer coordination issues (even though there are recent advances for addressing this issue Let's now assume that the recovery strategy is deployed at the optical layer. This scenario is depicted in Fig.…”