Multi-scheme recovery in MPLS networks: preliminary results for a multischeme approach

MultiProtocol Label Switching (MPLS) networks have been proposed as a solution to offer reliable, efficient and differentiated telecommunication services. Nowadays several applications require high quality service and cannot recover from traffic loss using retransmissions. Routing protocols can be robust and survivable but take a long time to recover from faults, which will not be acceptable for many applications. Therefore several schemes and frameworks for MPLS recovery have been proposed to handle failures quickly [3]. The authors proposed [2] a multi-scheme recovery approach, which intends to increase overall network resilience, while using network resources efficiently by taking into account resilience requirements of different class types. This approach tries to offer protection to a set of services by choosing the most appropriate recovery scheme, taking into account the service class, the network state, and the characteristics of available recovery schemes. The appropriate recovery scheme [3] will therefore be chosen based on a combination of quantitative measures and qualitative classification. The proposed recovery multi-scheme tries to ensure support for strict QoS guarantees, for different DiffServ classes [1], including in failure conditions. Bandwidth reservation (including, if required, pre-reservation) is carried out on a per-Diffserv class basis not just to the normal case but also in failure situations while trying to optimize the use of network resources. This work presents preliminary performance results from a study of the proposed multi-scheme. References [1] Faucheur, F. L. & Lai, W., 2003. Requirements for support of differentiated services aware MPLS traffic engineering. IETF RFC 3564. [2] Jorge, L. M. G.& Gomes, T. M., "Multi-scheme recovery in MPLS networks", C.Guedes Soares & E. Zio (editores), Safety and Reliability for Managing Risk, Volume 3, Taylor & Francis (Balkema), Actas do congresso ESREL 2006, Estoril, 18-22 de Setembro de 2006, pág. 2263-2271, 2006. [3] Jorge, L. M. G.& Gomes, T. M., Luísa Maria Garcia Jorge, Teresa Martinez Gomes, "Survey of Recovery Schemes in MPLS Networks", W. Zamojski, J. Mazurkiewicz, J. Sugier e T. Walkowiak (editores), DepCoS - RELCOMEX 2006, Dependability of Computer Systems, 25-27 de Maio de 2006, Szklarska Poreba, Polónia. pág. 110-118, 200

E3MS: A traffic engineering prototype for autoprovisioning services in IP/DiffServ/MPLS networks

This paper presents the testbed definition, implementation and trials of a new strategy for traffic autoprovisioning for MPLS and IP/DiffServ. This is the proof of concept of a new scenario for traffic engineering, for selfconfiguring control and end-to-end quality of service management by means of a tool based on Web Services. The system is structured in 3 layers: A Graphical User Interface, a Network Elements layer (an interface to physical devices) and, in the middle, a Network Management System layer, where decisions about admission, load balancing, path selection, rerouting and bandwidth allocation per class are taken. The system includes Dynamic Resource Allocation (DRA) and Background Monitoring System (BMS) modules to globally manage network resources. The so-called Squatter and Legalization mechanisms are introduced as novelties added to traffic engineering. Those strategies permit the use of part of the available resources from other classes only while unused by the class owning them. The trials hav validated the management system, using Cisco routers.Postprint (published version

Multiclass data plane recovery using different recovery schemes in SDN: a simulation analysis

To provide dependable services SDN networks need to be resilient to link or switching node failures. This entails, when faults occur, ensuring differentiated types of recovery, according to carried traffic, to routing paths. However, the choice of the recovery scheme best suited to each traffic class is not direct, nor is obvious the impact of the combination of various recovery schemes, according to traffic classes. We explore the usage of different recovery schemes for traffic with distinct requirements Simulation analysis confirms that using different recovery schemes for distinct types of traffic does create differentiated effects in terms of traffic carried and bandwidth usage.info:eu-repo/semantics/publishedVersio

Bandwidth constraint models: a performance study

Paper presented at IEEE GLOBECOM 2006 - 2006 Global Telecommunications Conference. San Francisco, CA: pp. 4150664.Bandwidth constraint models have been a topic of intense discussions at the IETF meetings. Three conventional methods have been described in informational IETF RFCs and their performance on a single link has been analyzed and discussed in the literature. In this article, we take a further step into analyzing their performance and optimal bandwidth constraint setting for a real network scenario. A new model is proposed and compared to existing ones when failure events may cause preemption of traffic trunks in a network. Our simulations results provide great insight on the benefits of the methods

The Squatting and Kicking strategies for self-provisioned, bandwidth resource sharing in multiclass networks

English: This article proposes a self-provisioned, Squatting and Kicking bandwidth resource sharing strategy for multiclass networks where differentiated services are not natively built. Moreover, this article provides a summary of the bandwidth constraints models and shows how the squatting and kicking strategies can be adapted to be the basis for a new bandwidth constraint model, which widens the range of techniques available to operators for bandwidth resource management in multiclass networks.Castellano: Este artículo propone unas estrategias para compartir ancho de banda en redes multi-clase de manera auto-gestionada, donde los servicios diferenciados no se soportan de manera nativa. Además, se provee una comparación de los modelos de ancho de banda limitado y cómo las estrategias "squat" y "kick" se pueden constituir como nuevo modelo. Dicho model ampliará el número de técnicas que los operadores tienen disponibles para la gestión de tráfico en redes multi-clase.Català: Aquest article proposa unes estratègies per a compartir l'amplada de banda en xarxes multi-classe de manera auto-gestionada, a on els serveis diferenciats no se suporten de manera nadiua. A més a més, se proveeix una comparació dels models d'amplada de banda limitat i com les estratègies "squat" i "kick" es poden constituir com a nou model. Aquest nou model ampliarà el nombre de tècniques de que disposen els operadors de xarxes multi-classe per a la gestió del tràfic

Network emulation focusing on QoS-Oriented satellite communication

This chapter proposes network emulation basics and a complete case study of QoS-oriented Satellite Communication

UMA VISÃO TUTORIAL DOS MODELOS DE ALOCAÇÃO DE BANDA (BAM – BANDWIDHT ALLOCATION MODELS) COMO MECANISMO DE PROVISIONAMENTO DE RECURSOS EM REDES IP/MPLS/DS-TE

Bandwidth Allocation Models (BAMs) were initially conceived as a support element defining rules and limits for resource allocation (bandwidth) for Traffic Classes (TCs) in IP/MPLS/DS-TE networks. BAMs evolved on its basic purpose to deploy rules and limits for TC resources focusing on IP networks. As such, distinct BAM models and solutions were developed such as MAM (Maximum Allocation Model), RDM (Russian Dolls Model), AllocTCSharing e GBAM (Generalized BAM). Another important, relevant and interesting aspect of BAM evolution is its ability to be applied on new contexts like optical networks resource allocation, cloud computing resource provisioning and support to neutrality evaluation in telephony networks. Beyond that, BAMs have been applied and researched as a basic tool and support to optimization, reconfiguration and deployment of management systems with autonomic characteristics. Considering then this large scope and research interest involved, this paper presents a tutorial vision of the BAMs focusing specifically on resource provisioning for IP/MPLS/DS-TE networks. The paper presents sequentially the concepts around BAM, starting from basic IP needs and following with MPLS, DS-TE and Traffic Engineering related aspects.  Following that, the most relevant BAMs are introduced and discussed. Finally, a simulation is presented exploring the dynamic switching of BAM models towards parameters reconfiguration and optimization like utilization, preemption and blocking among others.Os Modelos de Alocação de Banda (BAM – Bandwidth Allocation Models) foram concebidos inicialmente de forma a suportar a implantação de regras e limites de utilização de recursos como banda para Classes de Tráfego (TCs) em Redes IP/MPLS/DS-TE. Os BAM evoluíram inicialmente na sua proposta básica de implantar regras e limites de utilização de banda focando exclusivamente no contexto de Redes IP. Em efeito, entre os BAM mais citados e pesquisados na literatura, destacam-se as opções MAM (Maximum Allocation Model), RDM (Russian Dolls Model), AllocTCSharing e GBAM (Generalized BAM). Outro aspecto relevante, evolutivo e interessante dos BAM demonstrado na literatura é a sua aplicabilidade em outros contextos como na alocação de recursos para redes ópticas, provisionamento de recursos em nuvem e suporte à avaliação de neutralidade em redes de telefonia. Além disso, os BAM também tem sido pesquisados como mecanismo de suporte para a otimização, reconfiguração e implantação de soluções com características autonômicas em redes IP. Diante desta abrangência e possibilidades de aplicações, este artigo propõe uma visão tutorial dos Modelos de Alocação de Banda com um foco específico no provisionamento de recursos em Redes IP. Isso de forma a apoiar não somente a pesquisa como também a curva de aprendizado de pesquisadores e desenvolvedores interessados na temática. O artigo apresenta de forma sequencial e tutorial os conceitos envolvidos com os BAM. Apresenta-se desde os conceitos mais básicos do IP, passando pelo MPLS, DS-TE e Engenharia de Tráfego. Em seguida, os BAM mais relevantes são apresentados e discutidos, complementando com uma simulação onde se explora a utilização dinâmica dos BAM de forma a configurar e/ou otimizar parâmetros de operação de rede tais como utilização, bloqueio e preempção, dentre outros

Real-time bandwidth encapsulation for IP/MPLS Protection Switching

Bandwidth reservation and bandwidth allocation are needed to guarantee the protection of voice traffic during network failure. Since voice calls have a time constraint of 50 ms within which the traffic must be recovered, a real-time bandwidth management scheme is required. Such bandwidth allocation scheme that prioritizes voice traffic will ensure that the voice traffic is guaranteed the necessary bandwidth during the network failure. Additionally, a mechanism is also required to provide the bandwidth to voice traffic when the reserved bandwidth is insufficient to accommodate voice traffic. This mechanism must be able to utilise the working bandwidth or bandwidth reserved for lower priority applications and allocate it to the voice traffic when a network failure occurs