Chinese Internet AS-level Topology

We present the first complete measurement of the Chinese Internet topology at the autonomous systems (AS) level based on traceroute data probed from servers of major ISPs in mainland China. We show that both the Chinese Internet AS graph and the global Internet AS graph can be accurately reproduced by the Positive-Feedback Preference (PFP) model with the same parameters. This result suggests that the Chinese Internet preserves well the topological characteristics of the global Internet. This is the first demonstration of the Internet's topological fractality, or self-similarity, performed at the level of topology evolution modeling.Comment: This paper is a preprint of a paper submitted to IEE Proceedings on Communications and is subject to Institution of Engineering and Technology Copyright. If accepted, the copy of record will be available at IET Digital Librar

On the challenges of establishing disjoint QoS IP/MPLS paths across multiple domains

MPLS is being actively adopted as the core switching infrastructure at the intradomain level. This trend is mainly attributable to the undeniable potential of MPLS in terms of virtual private networks (VPNs) management, traffic engineering (TE), QoS delivery, path protection, and fast recovery from network failures. However, little progress has been made to attain the expected extension of MPLS label-switched paths (LSPs) across domain boundaries. Among the problems that remain unsolved is how to efficiently find and establish primary and protection interdomain LSPs for mission-critical services subject to QoS constraints. This article explores the major limitations hindering the deployment of these kinds of LSPs across multiple domains, in the context of the current interdomain network model. We describe the critical problems faced by the research community, and present our vision on how to rationally overcome some of the problems exposed. Our perspective is that we should be prepared for rather coarse-grained solutions as long as we need to coexist with the current interdomain network modelPostprint (published version

A critical look at power law modelling of the Internet

This paper takes a critical look at the usefulness of power law models of the Internet. The twin focuses of the paper are Internet traffic and topology generation. The aim of the paper is twofold. Firstly it summarises the state of the art in power law modelling particularly giving attention to existing open research questions. Secondly it provides insight into the failings of such models and where progress needs to be made for power law research to feed through to actual improvements in network performance.Comment: To appear Computer Communication

Encaminamiento interdominio con calidad de servicio basado en Overlay Entities distribuidas y QBGP

Este documento propone un nuevo enfoque al tema de encaminamiento inter-domino con Calidad de Servicio(QoS). Nuestro enfoque consiste en proporcionar una arquitectura overlay completamente distribuida así como una nueva capa de encaminamiento para el aprovisionamiento dinámico de QoS, pero haciendo uso de las extensiones de QoS y las capacidades de Ingeniería de Tráfico (TE) de la subyacente capa BGP para el aprovisionamiento estático de QoS. Nuestro objetivo radica principalmente en influenciar como se intercambia el tráfico entre Sistemas Autónomos(Ases) remotos y con múltiples conexiones a Internet, basados en parámetros específicos y preestablecidos de QoS. Proporcionamos un conjunto de resultados obtenidos mediante simulación los cuales avalan la factibilidad de nuestra propuesta.Postprint (published version

Inteligencia Computacional Aplicada a la Evaluación de Calidad de Servicio

The quality of service QoS evaluation specifically in the packet routing satisfies requirements of performance and maximizes the resources utilization of the network by means of paths selection based on the resources that are needed. More in the investigations about the quality of service support in the routing are focused in the one-domain routing, BGP, the standart for the inter-domain routing does not provide mechanism to evaluate the quality the service and taking in consideration that the quality of service experienced by the users, it is influenced by all domains through the end-to-end path, it is necessary the development of schemes of inter-domain routing that evaluate efficiently the quality of service. The proposed research is focused in the computational intelligence application in a prototypeof interdomain routing based in policies. We present a fuzzy logic approach to evaluate the quality of service, in this way selectpaths depending multiple heterogeneous criteria.La evaluación de calidad de servicio especificamente en el encaminamiento de paquetes satisface requerimientos de desempeño y maximiza la utilización de los recursos de la red por medio de la selección de caminos con base en los recursos que se requieran. Muchas de las investigaciones acerca del soporte de la calidad de servicio en el encaminamiento se enfocan en el encaminamientode un solo dominio. BGP, el estandar de facto para el encaminamiento inter-domio no provee mecanismo para sopotar la calidad del servicio y tomando en consideración que la calidad de servicio experimentada por los usuarios esta influenciada por todos los dominios a través del camino, es necesario el desarrollo de esquemas de encaminamiento inter-dominio que evalúen eficientemente la calidad del servicio. La investigación propuesta busca la aplicación de la inteligencia computacional en la evaluación de la calidad de servicio en un prototipo de encaminamiento inte-dominio con base en políticas de encaminamiento inter-dominio. Se presenta un acercamiento basado en lógica difusa para la evaluación de la calidad de servicio, a fin de seleccionar caminos en función de múltiples criterios heterogéneos