Fault/Attack Tolerant Recovery Mechanism Under SRLG Constraint in the Next Generation Optical VPN

A “Virtual Private Network (VPN) over Internet” has the benefits of being cost-effective and flexible. However, given the increasing demands for high bandwidth Internet and for reliable services in a “VPN over Internet,” an IP/GMPLS over DWDM backbone network is regarded as a very favorable approach for the future “Optical VPN (OVPN)” due to the benefits of transparency and high data rate. Nevertheless, OVPN still has survivability issues such that a temporary fault can lose a large amount of data in seconds, moreover unauthorized physical attack can also be made on purpose to eavesdrop the network through physical components. Therefore fault/attack tolerant recovery mechanism that considers physical components is needed because optical network has vulnerabilities involved in the intrinsic characteristics, and these characteristics possibly menace reliable services in OVPN. Thus in this paper, with considering fault/attack in the next generation OVPN, we propose a recovery mechanism under shared risk link group (SRLG) constraint for network survivability by means of the classification of optical components and shared risk levels.

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