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Label Switching (label + switching)

Distribution by Scientific Domains

Engineering	50%

Selected Abstracts

Effect of load distribution in path protection of MPLS

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 4 2003
Sook-Yeon Kim
Abstract We analyse and compare a protection mechanism based on load distribution with a typical protection mechanism in an multiprotocol label switching (MPLS) network. The protection mechanism based on load distribution is modelled as a fully shared mechanism (FSM) and the typical protection mechanism is a partially shared mechanism (PSM). By comparing the FSM and the PSM, we numerically analyse the effect of load distribution in path protection of MPLS. The comparison is based on numerical equations representing the relationship between service reliability and resource utilization. From the equations, we show that both the FSM and the PSM have a tradeoff between service reliability and resource utilization. In addition, we provide solutions for the FSM and the PSM to determine the amount of bandwidth occupied according to the requested service reliability. The comparison of the FSM and the PSM shows that the PSM cannot provide greater service reliability than the FSM under the same utilization. In addition, the PSM is not capable of accommodating greater resource utilization than the FSM for the same level of service reliability. However, an appropriate choice of the number of protection paths allows the PSM to provide the same level of service reliability as the FSM. The choice is the maximum among the possible numbers of protection paths of the PSM. In short, the typical protection mechanism is as good as the FSM in terms of service reliability and resource utilization even though the FSM is an attractive alternative to the typical protection mechanism. Copyright © 2003 John Wiley & Sons, Ltd. [source]

Providing IP QoS over GEO satellite systems using MPLS

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING, Issue 5 2001
Tolga Ors
Abstract Multi-protocol label switching (MPLS) is a promising technology that is quickly gathering momentum as a solution for delivering quality of service (QoS) on IP-based terrestrial networks. It is then appropriate to wonder how this technology could affect the next generation satellite networks (from at least an interoperability standpoint) and if satellite network designers should implement MPLS on their space segment (and if yes, how?). These are the main questions that this paper is addressing. We will show how MPLS can be used on top of any layer 2 technology on the space segment, to provide IP QoS. In particular we will discuss MPLS over ATM over satellite where MPLS is essentially used to control and manage an on-board ATM switch fabric. Problems with MPLS and solutions will be presented. As the digital video broadcast (DVB) standard is becoming popular to be used on both the forward and return link, the different methods to carry IP over DVB will also be discussed. Copyright © 2001 John Wiley & Sons, Ltd. [source]

Next-generation transport systems: 4th generation MSPPS

BELL LABS TECHNICAL JOURNAL, Issue 2 2006
James A. Kraeutler
Demand for Ethernet services is increasing exponentially worldwide. Improvements such as generic framing procedure (GFP) and virtual concatenation (VCAT) have been introduced, increasing the efficiency of synchronous optical network/synchronous digital hierarchy (SONET/SDH) transport for packet traffic. The growing volume of packet traffic necessitates further refinement of transport networking techniques toward a more packet-centric model that incorporates increased efficiency in handling packet traffic, and more packet-friendly optical networks; for example, multiprotocol label switching (MPLS) and generalized multiprotocol label switching (GMPLS) enabled networks. The most effective next-generation of multi-service provisioning platforms (MSPPs) must account for these realities and provide a solution for both bandwidth utilization and management capabilities while constituting a platform that can scale from last-mile access to metro core networks. These platforms should incorporate packet-based technologies including MPLS to provide a flexible and cost-effective mix of multi-service traffic engineering and encapsulation techniques, quality of service (QoS), security, and resiliency to providers competing in an increasingly packet-centric market. This paper explains how new transport systems are using novel architectures and exploiting new technologies to support emerging applications with network architectures best suited to the changing characteristics of the traffic they are required to carry. © 2006 Lucent Technologies Inc. [source]

Generalized MPLS-based distributed control architecture for automatically switched transport networks

BELL LABS TECHNICAL JOURNAL, Issue 1 2001
Yangguang Xu
Current circuit-switched transport networks, such as plesiochronous digital hierarchy (PDH) and synchronous optical network/synchronous digital hierarchy (SONET/SDH), have traditionally used centralized network management for connection control. To facilitate the value-added capabilities of today's networks,such as the rapid provisioning of services, dynamic setup of bandwidth requests, and fast mesh-based restoration,distributed connection control using signaling protocols has quickly gained industry momentum. Efforts have been initiated in various standards bodies to define the automatically switched transport network (ASTN). Although many architectural choices are now available, this paper describes a distributed control plane architecture that can be applied to various circuit-switching technologies and different network applications. This architecture adopts the concept of a generalized version of multiprotocol label switching (MPLS), which extends and modifies MPLS and other protocols on the Internet to make them applicable to various transport networks and also facilitates optical data networking. Four major functional components are incorporated in this architecture: element-level resource discovery, state information dissemination, path selection, and path control modules. Using these concepts, the transport network can be viewed as a virtual nonblocking, reconfigurable backplane of different network clients. This view represents a radical departure from the traditional data networking view of transport networks as providing fixed pipes and will have a dramatic impact on future network interworking and end-to-end traffic engineering (TE). [source]