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Much effort has been spent on the definition of control plane protocols for automatically switched optical networks (ASON). Most of the proposals brought into the standardization for an International Telecommunications Union-Telecommunication Sector, Internet Engineering Task Force, and Optical Internetworking Forum are based on Internet protocol concepts. One such proposal is the generalized multi-protocol label switching (GMPLS), an extension of the MPLS traffic engineering control plane model that includes nonpacket switched technologies (time, wavelength, and fiber switching). Recently, the potential use of private network-network interface (PNNI) in ASONs has been discussed as an alternative proposal by the standardization bodies. The goal of this paper is to appropriately adapt asynchronous transfer mode into an optical PNNI (O-PNNI) protocol that can be used as the control plane of ASONs. The paper also provides a critical viewpoint on the potential usage of either O-PNNI or GMPLS control plane and analyzes the pros and cons of each. The methodology adopted toward devising O-PNNI hinges on reviewing PNNI along with ASON recommendations in order to determine the set of PNNI features that require adaptation. Having identified these features we engineer and present appropriate solutions relating to routing, signaling and addressing aspects Index Terms-Automatically switched optical networks (ASONs), control plane, optical networks, private networknetwork interface (PNNI). I. INTRODUCTION T HE exponential growth of data traffic is driving the evolution toward optical network infrastructures that enable the provisioning of high-bandwidth optical connections for Internet protocol (IP) centric data, video and voice applications. Although data traffic is growing exponentially, voice traffic, almost stable, is still representing the major source of revenues for network operators; as such to remain competitive. Network operators should be able to provide optical switched transport Manuscript

The purpose of this paper is to describe the activities and the preliminary results ofthe IST Project LION, whose main objective is to design and fest a robust und nianuged transport network bused on an ASON