The Experts below are selected from a list of 1917 Experts worldwide ranked by ideXlab platform
Nick Mckeown - One of the best experts on this subject based on the ideXlab platform.
-
header space analysis static checking for networks
Networked Systems Design and Implementation, 2012Co-Authors: Peyman Kazemian, George Varghese, Nick MckeownAbstract:Today's networks typically carry or deploy dozens of protocols and mechanisms simultaneously such as MPLS, NAT, ACLs and Route Redistribution. Even when individual protocols function correctly, failures can arise from the complex interactions of their aggregate, requiring network administrators to be masters of detail. Our goal is to automatically find an important class of failures, regardless of the protocols running, for both operational and experimental networks. To this end we developed a general and protocol-agnostic framework, called Header Space Analysis (HSA). Our formalism allows us to statically check network specifications and configurations to identify an important class of failures such as Reachability Failures, Forwarding Loops and Traffic Isolation and Leakage problems. In HSA, protocol header fields are not first class entities; instead we look at the entire packet header as a concatenation of bits without any associated meaning. Each packet is a point in the {0,1}L space where L is the maximum length of a packet header, and networking boxes transform packets from one point in the space to another point or set of points (multicast). We created a library of tools, called Hassel, to implement our framework, and used it to analyze a variety of networks and protocols. Hassel was used to analyze the Stanford University backbone network, and found all the forwarding loops in less than 10 minutes, and verified reachability constraints between two subnets in 13 seconds. It also found a large and complex loop in an experimental loose source routing protocol in 4 minutes.
-
header space analysis static checking for networks
Networked Systems Design and Implementation, 2012Co-Authors: Peyman Kazemian, George Varghese, Nick MckeownAbstract:Today's networks typically carry or deploy dozens of protocols and mechanisms simultaneously such as MPLS, NAT, ACLs and Route Redistribution. Even when individual protocols function correctly, failures can arise from the complex interactions of their aggregate, requiring network administrators to be masters of detail. Our goal is to automatically find an important class of failures, regardless of the protocols running, for both operational and experimental networks. To this end we developed a general and protocol-agnostic framework, called Header Space Analysis (HSA). Our formalism allows us to statically check network specifications and configurations to identify an important class of failures such as Reachability Failures, Forwarding Loops and Traffic Isolation and Leakage problems. In HSA, protocol header fields are not first class entities; instead we look at the entire packet header as a concatenation of bits without any associated meaning. Each packet is a point in the {0,1}L space where L is the maximum length of a packet header, and networking boxes transform packets from one point in the space to another point or set of points (multicast). We created a library of tools, called Hassel, to implement our framework, and used it to analyze a variety of networks and protocols. Hassel was used to analyze the Stanford University backbone network, and found all the forwarding loops in less than 10 minutes, and verified reachability constraints between two subnets in 13 seconds. It also found a large and complex loop in an experimental loose source routing protocol in 4 minutes.
Peyman Kazemian - One of the best experts on this subject based on the ideXlab platform.
-
header space analysis static checking for networks
Networked Systems Design and Implementation, 2012Co-Authors: Peyman Kazemian, George Varghese, Nick MckeownAbstract:Today's networks typically carry or deploy dozens of protocols and mechanisms simultaneously such as MPLS, NAT, ACLs and Route Redistribution. Even when individual protocols function correctly, failures can arise from the complex interactions of their aggregate, requiring network administrators to be masters of detail. Our goal is to automatically find an important class of failures, regardless of the protocols running, for both operational and experimental networks. To this end we developed a general and protocol-agnostic framework, called Header Space Analysis (HSA). Our formalism allows us to statically check network specifications and configurations to identify an important class of failures such as Reachability Failures, Forwarding Loops and Traffic Isolation and Leakage problems. In HSA, protocol header fields are not first class entities; instead we look at the entire packet header as a concatenation of bits without any associated meaning. Each packet is a point in the {0,1}L space where L is the maximum length of a packet header, and networking boxes transform packets from one point in the space to another point or set of points (multicast). We created a library of tools, called Hassel, to implement our framework, and used it to analyze a variety of networks and protocols. Hassel was used to analyze the Stanford University backbone network, and found all the forwarding loops in less than 10 minutes, and verified reachability constraints between two subnets in 13 seconds. It also found a large and complex loop in an experimental loose source routing protocol in 4 minutes.
-
header space analysis static checking for networks
Networked Systems Design and Implementation, 2012Co-Authors: Peyman Kazemian, George Varghese, Nick MckeownAbstract:Today's networks typically carry or deploy dozens of protocols and mechanisms simultaneously such as MPLS, NAT, ACLs and Route Redistribution. Even when individual protocols function correctly, failures can arise from the complex interactions of their aggregate, requiring network administrators to be masters of detail. Our goal is to automatically find an important class of failures, regardless of the protocols running, for both operational and experimental networks. To this end we developed a general and protocol-agnostic framework, called Header Space Analysis (HSA). Our formalism allows us to statically check network specifications and configurations to identify an important class of failures such as Reachability Failures, Forwarding Loops and Traffic Isolation and Leakage problems. In HSA, protocol header fields are not first class entities; instead we look at the entire packet header as a concatenation of bits without any associated meaning. Each packet is a point in the {0,1}L space where L is the maximum length of a packet header, and networking boxes transform packets from one point in the space to another point or set of points (multicast). We created a library of tools, called Hassel, to implement our framework, and used it to analyze a variety of networks and protocols. Hassel was used to analyze the Stanford University backbone network, and found all the forwarding loops in less than 10 minutes, and verified reachability constraints between two subnets in 13 seconds. It also found a large and complex loop in an experimental loose source routing protocol in 4 minutes.
George Varghese - One of the best experts on this subject based on the ideXlab platform.
-
header space analysis static checking for networks
Networked Systems Design and Implementation, 2012Co-Authors: Peyman Kazemian, George Varghese, Nick MckeownAbstract:Today's networks typically carry or deploy dozens of protocols and mechanisms simultaneously such as MPLS, NAT, ACLs and Route Redistribution. Even when individual protocols function correctly, failures can arise from the complex interactions of their aggregate, requiring network administrators to be masters of detail. Our goal is to automatically find an important class of failures, regardless of the protocols running, for both operational and experimental networks. To this end we developed a general and protocol-agnostic framework, called Header Space Analysis (HSA). Our formalism allows us to statically check network specifications and configurations to identify an important class of failures such as Reachability Failures, Forwarding Loops and Traffic Isolation and Leakage problems. In HSA, protocol header fields are not first class entities; instead we look at the entire packet header as a concatenation of bits without any associated meaning. Each packet is a point in the {0,1}L space where L is the maximum length of a packet header, and networking boxes transform packets from one point in the space to another point or set of points (multicast). We created a library of tools, called Hassel, to implement our framework, and used it to analyze a variety of networks and protocols. Hassel was used to analyze the Stanford University backbone network, and found all the forwarding loops in less than 10 minutes, and verified reachability constraints between two subnets in 13 seconds. It also found a large and complex loop in an experimental loose source routing protocol in 4 minutes.
-
header space analysis static checking for networks
Networked Systems Design and Implementation, 2012Co-Authors: Peyman Kazemian, George Varghese, Nick MckeownAbstract:Today's networks typically carry or deploy dozens of protocols and mechanisms simultaneously such as MPLS, NAT, ACLs and Route Redistribution. Even when individual protocols function correctly, failures can arise from the complex interactions of their aggregate, requiring network administrators to be masters of detail. Our goal is to automatically find an important class of failures, regardless of the protocols running, for both operational and experimental networks. To this end we developed a general and protocol-agnostic framework, called Header Space Analysis (HSA). Our formalism allows us to statically check network specifications and configurations to identify an important class of failures such as Reachability Failures, Forwarding Loops and Traffic Isolation and Leakage problems. In HSA, protocol header fields are not first class entities; instead we look at the entire packet header as a concatenation of bits without any associated meaning. Each packet is a point in the {0,1}L space where L is the maximum length of a packet header, and networking boxes transform packets from one point in the space to another point or set of points (multicast). We created a library of tools, called Hassel, to implement our framework, and used it to analyze a variety of networks and protocols. Hassel was used to analyze the Stanford University backbone network, and found all the forwarding loops in less than 10 minutes, and verified reachability constraints between two subnets in 13 seconds. It also found a large and complex loop in an experimental loose source routing protocol in 4 minutes.
Okoli, Emmanuel Chukwuebuka - One of the best experts on this subject based on the ideXlab platform.
-
Risk Governance of a Complex system using Route Redistribution as a case study
University of Stavanger Norway, 2020Co-Authors: Okoli, Emmanuel ChukwuebukaAbstract:Route Redistribution is a communication networking system that allows different routing protocols within a network to communicate with each other. These protocols offer different benefits to the network and network equipment; thus, companies can harness the benefits of the different protocols within their local area network using Route Redistribution. The benefits offered using Route Redistribution comes at the cost of systemic risk, which is a risk of breakdown of the entire system. This thesis aims to improve the risk governance of the complex system by using the risk governance framework beyond the normal traffic light model to the six-risk classification developed by the German Scientific Advisory Council for Global Environment Change and the use of FRAM and TRAM methods to model uncertainties
-
Risk Governance of a Complex system using Route Redistribution as a case study
University of Stavanger Norway, 2020Co-Authors: Okoli, Emmanuel ChukwuebukaAbstract:Master's thesis in Risk ManagementRoute Redistribution is a communication networking system that allows different routing protocols within a network to communicate with each other. These protocols offer different benefits to the network and network equipment; thus, companies can harness the benefits of the different protocols within their local area network using Route Redistribution. The benefits offered using Route Redistribution comes at the cost of systemic risk, which is a risk of breakdown of the entire system. This thesis aims to improve the risk governance of the complex system by using the risk governance framework beyond the normal traffic light model to the six-risk classification developed by the German Scientific Advisory Council for Global Environment Change and the use of FRAM and TRAM methods to model uncertainties
Arenas Mejia Bonel - One of the best experts on this subject based on the ideXlab platform.
-
Diplomado de profundización cisco CCNP solución de dos escenarios presentes en entornos corporativos bajo el uso de tecnología cisco
2020Co-Authors: Arenas Mejia BonelAbstract:Imágenes, tablas y diagramasDentro del presente documento se encuentran diferentes actividades realizadas sobre dos escenarios planteados en donde se plasman las habilidades aprendidas durante el diplomado de CCNP, que es de gran importancia en las telecomunicaciones, que como se sabe se basa en diferentes campos como la electrónica, comunicación y telemática, en donde se pondrá en práctica el uso de diferentes comandos de configuración de dispositivos CISCO para poder llegar a obtener una convergencia en cada una de las Redes planteadas, permitiendo de esta manera realizar configuraciones tanto para entornos de enrutamiento donde se requiere tener alcanzabilidad a diferentes redes, haciendo uso de equipos de capa 3 denominados Routers, configurando parámetros de enrutamiento dinámico con el uso de protocolos como EIGRP y OSPF, como lo propone el escenario 1, que cuenta con varios Routers que estarán interconectados y que contaran con los dominios correspondientes para cada uno de los protocolos de enrutamiento dinámico, pero que a su vez se hará uso de la redistribución de ruta para de esta manera llegar a tener una red totalmente convergente y con una conectividad extremo a extremo. En adición también se contara con configuraciones sobre entornos de conmutación en donde se verá el uso de enlaces redundantes y agregados, que serán controlados por diferentes protocolos, haciendo uso de dispositivos de capa 2 que a su vez pueden contar con funcionalidades de capa 3 denominados Switches, como lo propone el escenario 2, en donde se tienen diferentes Switches interconectados con enlaces agregados y redundantes, configurados por medio de la características EtherChannel con la que cuenta los dispositivos cisco, haciendo uso de protocolo como LACP (Link Aggregation Control Protocol) y PAgP (Port Aggregation Protocol) y evitando bucles de datos en la red por medio del protocolo STP (Spanning Tree Protocol). Todo esto contando con comandos de verificación para tener una completa claridad del funcionamiento correcto de los escenarios planteadosWithin this document there are different activities carried out on two scenarios outlined where the skills learned during the CCNP diplomat are reflected, which is of great importance in telecommunications, which, as is known, is based on different fields such as electronics, communication and telematics. where the use of different CISCO device configuration commands will be put into practice in order to achieve convergence in each of the proposed Networks, thus allowing configurations for both routing environments where it is required to have reachability to different networks, making use of layer 3 equipment called Routers, configuring dynamic routing parameters with the use of protocols such as EIGRP and OSPF, as proposed in scenario 1, which has several Routers that will be interconnected and that will have the corresponding domains for each of the routing protocols dynamic, but which in turn will make use of Route Redistribution in order to achieve a fully converged network with end-to-end connectivity. In addition, there will also be configurations on switching environments where the use of redundant and aggregated links will be seen, which will be controlled by different protocols, making use of layer 2 devices that in turn can have layer 3 functionalities called Switches , as proposed by scenario 2, where there are different Switches interconnected with aggregated and redundant links, configured through the EtherChannel characteristics that Cisco devices have, making use of protocols such as LACP (Link Aggregation Control Protocol) and PAgP (Port Aggregation Protocol) and avoiding data loops in the network by means of the STP (Spanning Tree Protocol) protocol. All this with verification commands to have complete clarity of the correct operation of the proposed scenarios
