Abstract

Part 6: Quality through Routing, Naming and Control; International audience; The evolution of various wireless technologies has greatly increased the interest in heterogeneous networks, in which the mobile users can enjoy services while roaming between different networks. The current Internet architecture does not seem to cope with the modern networking trends and the growing application demands for performance, stability and efficiency, as the integration of different technologies faces many problems. In this paper, we focus on the issues raised when attempting to provide seamless mobility over a hybrid environment. We highlight the shortcomings of the current architecture, discuss some of the proposed solutions and try to identify the key choices that lead to failure. Finally, we introduce RINA (Recursive Inter-Network Architecture), a newly-proposed network architecture that achieves to integrate networks of different characteristics inherently and show a simple example that demonstrates this feature. Document type: Part of book or chapter of book

Abstract

Within GMPLS framework, the signaling protocol Resource reSerVation Protocol with Traffic Engineering extensions (RSVP-TE) is extended to support the requirements of an Automated Switched Optical Network architecture. This paper presents the extensions of the end-to-end connection services in an overlay network built on two control planes. RSVP-TE protocol extensions are first described between an IP/MPLS router and a SDH/GMPLS core optical cross-connect, defining GMPLS-UNI. Dimensioning of three scenarios proving the benefits of GMPLS-UNI is discussed. Document type: Part of book or chapter of book

Abstract

Large IP backbone networks today are mostly deployed directly over sequences of point-to-point DWDM systems or chains of newer ROADM-based ultra long haul systems, interconnected by OEO regenerators. The next generation core optical network is moving toward an all-optical network architecture that is based on multi-degree ROADMs to reduce OEO regeneration cost as well as enabling automatic reconfigurability and dynamic restoration. In this paper, we study the restoration design in this new IP over reconfigurable all-optical network architecture to satisfy the resilience requirements for both IP and wavelength services. We propose two novel restoration schemes: 2-Phase Fast Reroute mechanism with optimized Traffic Engineering algorithm for restoring IP services and shared mesh restoration with standbys for restoring wavelength services. They both meet the requirement of sub-second restoration time and also maximize sharing among different failures with the objective of minimizing either overall capacity or overall cost. To further reduce the required restoration capacity in both IP layer and optical layer and address failures in both layers efficiently, we also propose an integrated IP-over-optical layer restoration strategy that enables sharing of restoration capacity among non-simultaneous failures across both IP and optical layers. Simulation results demonstrate significant improvements using our proposed schemes comparing with existing ones. Document type: Part of book or chapter of book

Abstract

Date of Conference: 1-3 Oct. 2003 Conference name: Proceedings of the 3rd IEEE Workshop on IP Operations & Management (IPOM 2003) We propose a novel traffic engineering architecture for IP networks with multiprotocol label switching (MPLS) backbones. In this architecture, two (primary and secondary) label switched paths (LSPs) are established among every pair of IP routers located at the edge of an MPLS cloud. Traffic between a source-destination pair is then split between the primary and secondary LSPs using an ABR-like explicit-rate feedback gathered from the network. Taking into consideration the packet reordering effect of packet-based load balancing schemes, we propose a novel traffic splitting mechanism that operates on a per-flow basis. We show, using a variety of scenarios, that deploying flow-based multipath traffic engineering not only provides significantly and consistently better throughput than that of a single path, but is also void of any packet reordering. © 2003 IEEE.

Abstract

Conference of 10th IEEE International Symposium on Industrial Embedded Systems, SIES 2015 ; Conference Date: 8 June 2015 Through 10 June 2015; Conference Code:116797; International audience; Many-core architectures are promising hardware to design hard real-time systems as they are based on simpler and thus more predictable processors than multi-core systems. However, the worst-case behavior of the Network-on-Chip (NoC) for both inter-core and core to external memories or peripherals communications must be established. Several NoCs targeting hard real-time systems, made of specific hardware extensions, have been designed. However, none of these extensions are currently available in commercially existing NoC-based many-core architectures, that instead rely on wormhole switching with round-robin arbitration. In this paper, we thus demonstrate three properties of such NoC-based wormhole networks to identify worst-case scenarios and reduce the pessimism when modeling flows in contentions. We then describe and evaluate an algorithm to compute Worst-Case Traversal Time (WCTT) of flows that uses these properties. In particular, our results show that the pessimism can be reduced up to 50% compared to current state-of-the-art real-time packet schedulability analysis.

Abstract

The book presents mechanisms, protocols, and system architectures to achieve end-to-end Quality-of-Service (QoS) over heterogeneous wired/wireless networks in the Internet. Particular focus is on measurement techniques, traffic engineering mechanisms and protocols, signalling protocols as well as transport protocol extensions to support fairness and QoS. It shows how those mechanisms and protocols can be combined into a comprehensive end-to-end QoS architecture to support QoS in the Internet over heterogeneous wired/wireless access networks. Finally, techniques for evaluation of QoS mechanisms such as simulation and emulation are presented. The book is aimed at graduate and post-graduate students in Computer Science or Electrical Engineering with focus in data communications and networking as well as for professionals working in this area.

Abstract

International audience; This paper deals with Multi-Protocol Label Switching-Traffic Engineering Routing (MPLS-TE Routing) Systems which offer key Traffic Engineering features, such as optimization of resources utilization, Quality-of-Service (QoS) and Fast Recovery. Numerous MPLS-TE Routing systems have been defined in the past with their own advantages and drawbacks. This paper proposes a generic architecture for MPLS-TE Routing Systems, with the main objective of helping in classification, analysis and improvement of these systems or the design of new systems. This architecture includes main functions that may be required in an MPLS-TE Routing System. These functions and their interactions are described. Various approaches and options for the implementation and the distribution of these functions in network elements are qualitatively analyzed. A classification of some well known MPLS-TE routing systems is finally proposed.

Abstract

International audience; This paper deals with Multi-Protocol Label Switching-Traffic Engineering (MPLS-TE) routing systems which offer key traffic engineering features, including optimization of resources utilization, Quality-of-Service (QoS) and fast recovery. Numerous MPLS-TE routing systems have been defined in the past with their own advantages and drawbacks. This paper proposes a generic architecture for MPLS-TE routing system, with the main objective of helping in classification, analysis and improvement of these systems or the design of new systems. This architecture includes main functions that can be required in an MPLS-TE routing system. These functions and their interactions are described. Various approaches and options for the implementation and the distribution of these functions in network elements are qualitatively discussed.