Multidomain Optical Networks: Issues and Challenges
نویسنده
چکیده
Carriers usually deploy traffic engineering (TE) technologies such as generalized multi-protocol label switching (GMPLS)-TE to offer valueadded services. Nevertheless, these technologies are restricted to intra-domain networks, narrowing the scope of potential service offers. Currently, there is a clear demand to extend guaranteed service offers beyond domain boundaries. To support inter-domain services, one must rely on inter-provider quality of service (QoS) mechanisms, usually referred to as interautonomous system (inter-AS) QoS mechanisms. The Internet Engineering Task Force (IETF) has defined an extension to the GMPLS-TE technology, called inter-AS GMPLS-TE, which enables the establishment of inter-provider, explicitly routed, connections with stringent QoS and availability constraints. In this article, we propose to enrich the current inter-AS GMPLS-TE technology to enable automatic provisioning of inter-domain TE services. We define the basis of a global architecture that enables an automatic provisioning of multidomain TE network services, defined within the French “Agence Nationale pour la Recherche — Approche Combinée de Technologies Réseaux Inter-domaine sous Contraintes Economiques” (ANR ACTRICE) project. In the following section, we describe the inter-AS GMPLS-TE building blocks involved in our solution, and we indicate their current limitations in achieving our goal. We then propose to introduce a service plane coupled with the path computation element (PCE)-based architecture, and we show how this service plane allows for negotiations of provider service elements through successive phases of selection, instantiation, and activation. Finally, we define the required extensions to existing protocols and management elements, and we illustrate how they can be applied to offer automatic provisioning of inter-AS TE services.
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تاریخ انتشار 2008