Multiprotocol Lambda Switching: Combining MPLS Traffic Engineering Control with Optical Crossconnects

This article describes an approach to the design of control planes for optical crossconnects which leverages existing control plane techniques developed for MPLS traffic engineering. The proposed approach combines recent advances in MPLS traffic engineering control plane constructs with OXC technology to provide a framework for real-time provisioning of optical channels, foster development and deployment of a new class of OXCs, and allow the use of uniform semantics for network management and operations control in hybrid networks consisting of OXCs and label switching routers. The proposed approach is particularly advantageous for OXCs intended for data-centric optical internetworking systems

Optimal Traffic Partitioning in MPLS Networks

Multiprotocol Label Switching (MPLS) is an emerging Internet technology that facilitates traffic engineering in service provider networks. This paper considers a network performance optimization problem related to traffic engineering over MPLS. We investigate the issue of dynamic partitioning of MPLS ingress traffic into several parallel Label Switched Paths (LSP). Specifically, we present a stochastic framework for the traffic partitioning problem. Within this framework, a set of parallel edge disjoint LSPs is modeled by parallel queues and a partitioning algorithm is devised for different service classes that is adaptive to the prevailing state of the network. The performance of this approach is illustrated by numerical examples. Document type: Part of book or chapter of boo

On Resource Discovery in Distributed Systems with Mobile Hosts

Future distributed systems are expected to support mo-bile computing through wireless extensions. In such environments, the spatial location of system resources, such as servers, can change dynamically as a result of host mobility. Consequently, a search or discovery cost is incurred when-ever a client requests use of a mobile resource whose location is unknown. In addition, because of the acute dependence of radio link performance on the characteristics of indoor operating environments, the Quality of Service experienced by a client that utilizes a mobile resource can depend on the resource’s specific location. The work reported in this paper proposes and evaluates a statistical framework for resource discovery in distributed computing environments with mo-bile hosts. Specifically, taking the peculiar attributes of wireless segments of the distributed system into account, we investigate the interplay between the cost of search for po-tentially mobile resources and the utility or benefit accrued to clients that require such resources. This interplay has im-portant ramifications for resource allocation in distributed mobile computing environments