9 research outputs found
Performance Analysis of Different Open Flow Based Controller Over Software Defined Networking
Software Defined Networking (SDN) is a new networking paradigm where control plane is separated from data plane. Over the past several years, SDN has emerged as a compelling paradigm for developing and deploying new network capabilities and services. OpenFlow is the most commonly deployed Software Defined Networking architecture. Multiple networking switches can be controlled by a single centralized controlled OpenFlow controller. Different Python and Java based OpenFlow controller are available for Software Defined Networking. This paper implements Ryu, POX and Pyretic OpenFlow based Python controller in tree networking topology over Software Defined Networking. The result of this paper shows that these Python based OpenFlow controller performs well over SDN. All the implementation of different controller has been done using Mininet Emulator. The result of this paper also shows Pyretic controller has an excellent performance over Software Defined Networking compare to POX and Ryu Controller
Challenges to support edge-as-a-service
A new era in telecommunications is emerging. Virtualized networking functions and resources will offer network operators a way to shift the balance of expenditure from capital to operational, opening up networks to new and innovative services. This article introduces the concept of edge as a service (EaaS), a means of harnessing the flexibility of virtualized network functions and resources to enable network operators to break the tightly coupled relationship they have with their infrastructure and enable more effective ways of generating revenue. To achieve this vision, we envisage a virtualized service access interface that can be used to programmatically alter access network functions and resources available to service providers in an elastic fashion. EaaS has many technically and economically difficult challenges that must be addressed before it can become a reality; the main challenges are summarized in this article
Software-Defined Networking in Datacenter Network Virtualization
Työn aiheena on tutustua SDN-arkkitehtuuriin ja selvittää, miten se soveltuu osaksi konesaliverkkojen virtualisointia. Työssä käydään läpi verkkoarkkitehtuurien historiaa, sekä tarpeita, joista SDN-arkkitehtuuri on syntynyt. Työssä käydään läpi muutamia avoimen ja suljetun lähdekoodin SDN-sovelluksia, sekä esitellään verkkojen virtualisoinnin perusteet. Tarkempaan käsittelyyn valitaan avoimen ja suljetun lähdekoodin sovellukset, jotka yhdistävät sekä SDN-arkkitehtuurin, että verkkojen virtualisoinnin. Tutkimustulokseksi saadaan, että SDN-arkkitehtuurista on konkreettista hyötyä konesaliverkkojen virtualisoinnista. Saavutettava hyöty riippuu kuitenkin lähtökohdista. Olemassa olevassa konesalissa SDN-sovellus on riippuvainen kytkinlaitteistosta. Uudessa konesalissa SDN-sovellus voidaan valita vapaammin
Coretic : nouvelle écriture des règles pour améliorer l'isolation et la composition en SDN
SDN (Software Defined Networking) est une nouvelle architecture réseau qui permet d’apporter une solution à la complexité des tâches des équipements réseaux. Cette architecture permet de séparer le plan de données, chargé d’acheminer les données, du plan de contrôle qui fournit les règles de gestion des flux. Au-dessus du plan de contrôle, s’ajoute le plan de gestion qui permet d’envoyer des instructions au plan de données en utilisant un langage évolué. Les travaux de recherche apportent des solutions pour permettre l’isolation des trafics, la composition des plans de contrôle et pour la gestion des flux au niveau du plan de gestion en SDN. Les solutions actuelles d’isolation et de composition présentent des techniques de gestion des entrées de flux ayant des faiblesses. Certaines utilisent des informations de la couche 2 du modèle OSI (Open System Interconnection) (Ahmed, Mohamed Fekih. 2015). Effectuer l’isolation en se servant des informations de la couche 2 entraîne une génération de plusieurs entrées dans les tables de flux, ce qui affecte les performances. D’autres solutions utilisent une seule table de flux pour insérer les règles de plusieurs contrôleurs (Jin, Xin. 2015). Ceci entraîne une cohésion faible des tables concernées. Un couplage élevé est aussi constaté par l’utilisation de plusieurs tables reliées entre elles (Dixit, A. 2014). Quant aux solutions au niveau du plan de gestion, elles ne permettent pas à plusieurs plateformes de programmation de haut niveau d’utiliser un contrôleur commun.
Dans ce travail de maîtrise, il est proposé Coretic qui vise à améliorer l’écriture des règles dans le plan de données pour l’isolation et la composition. Étant donné que le rôle du plan de contrôle est confié au plan de gestion utilisant les plateformes de programmation de haut niveau, ce travail propose une solution permettant d’isoler le trafic des plans de gestion en utilisant un contrôleur commun. Coretic pour atteindre ses objectifs se sert des informations de la couche 3 du modèle OSI et de plusieurs tables de flux. Des tests de performance ont permis de montrer que Coretic offre de meilleures performances dans l’isolation et la composition. La solution d’hypervision des plans de gestions ne crée pas une degradation importante des performances. Coretic à la suite des tests effectués apporte les contributions suivantes :
• Apport d’une nouvelle approche d’isolation et de composition de plans de contrôles basée sur l’utilisation de tables multiples et de l’utilisation d’adresses IP de la couche 3.
• Apport d’une solution d’hypervision des plans de gestion.
Ces contributions permettent d’améliorer les performances dans le plan de données. La cohésion des tables de flux est renforcée, car ces tables reçoivent chacune des politiques bien précises. Le couplage devient faible aussi, car Coretic laisse les tables traiter les flux en toute indépendance. Avec Coretic, il est possible d’utiliser qu’un seul contrôleur pour isoler le traffic de plusieurs plans de gestion
Integração do paradigma de cloud computing com a infraestrutura de rede do operador
Doutoramento em Engenharia InformáticaThe proliferation of Internet access allows that users have the possibility to use
services available directly through the Internet, which translates in a change of
the paradigm of using applications and in the way of communicating,
popularizing in this way the so-called cloud computing paradigm. Cloud
computing brings with it requirements at two different levels: at the cloud level,
usually relying in centralized data centers, where information technology and
network resources must be able to guarantee the demand of such services;
and at the access level, i.e., depending on the service being consumed,
different quality of service is required in the access network, which is a Network
Operator (NO) domain. In summary, there is an obvious network dependency.
However, the network has been playing a relatively minor role, mostly as a
provider of (best-effort) connectivity within the cloud and in the access network.
The work developed in this Thesis enables for the effective integration of cloud
and NO domains, allowing the required network support for cloud. We propose
a framework and a set of associated mechanisms for the integrated
management and control of cloud computing and NO domains to provide endto-
end services. Moreover, we elaborate a thorough study on the embedding of
virtual resources in this integrated environment. The study focuses on
maximizing the host of virtual resources on the physical infrastructure through
optimal embedding strategies (considering the initial allocation of resources as
well as adaptations through time), while at the same time minimizing the costs
associated to energy consumption, in single and multiple domains.
Furthermore, we explore how the NO can take advantage of the integrated
environment to host traditional network functions. In this sense, we study how
virtual network Service Functions (SFs) should be modelled and managed in a
cloud environment and enhance the framework accordingly.
A thorough evaluation of the proposed solutions was performed in the scope of
this Thesis, assessing their benefits. We implemented proof of concepts to
prove the added value, feasibility and easy deployment characteristics of the
proposed framework. Furthermore, the embedding strategies evaluation has
been performed through simulation and Integer Linear Programming (ILP)
solving tools, and it showed that it is possible to reduce the physical
infrastructure energy consumption without jeopardizing the virtual resources
acceptance. This fact can be further increased by allowing virtual resource
adaptation through time. However, one should have in mind the costs
associated to adaptation processes. The costs can be minimized, but the virtual
resource acceptance can be also reduced. This tradeoff has also been subject
of the work in this Thesis.A proliferação do acesso à Internet permite aos utilizadores usar serviços
disponibilizados diretamente através da Internet, o que se traduz numa
mudança de paradigma na forma de usar aplicações e na forma de comunicar,
popularizando desta forma o conceito denominado de cloud computing. Cloud
computing traz consigo requisitos a dois nĂveis: ao nĂvel da prĂłpria cloud,
geralmente dependente de centros de dados centralizados, onde as
tecnologias de informação e recursos de rede têm que ser capazes de garantir
as exigĂŞncias destes serviços; e ao nĂvel do acesso, ou seja, dependendo do
serviço que esteja a ser consumido, sĂŁo necessários diferentes nĂveis de
qualidade de serviço na rede de acesso, um domĂnio do operador de rede. Em
sĂntese, existe uma clara dependĂŞncia da cloud na rede. No entanto, o papel
que a rede tem vindo a desempenhar neste âmbito é reduzido, sendo
principalmente um fornecedor de conectividade (best-effort) tanto no dominio
da cloud como no da rede de acesso.
O trabalho desenvolvido nesta Tese permite uma integração efetiva dos
domĂnios de cloud e operador de rede, dando assim Ă cloud o efetivo suporte
da rede. Para tal, apresentamos uma plataforma e um conjunto de
mecanismos associados para gestĂŁo e controlo integrado de domĂnios cloud
computing e operador de rede por forma a fornecer serviços fim-a-fim. Além
disso, elaboramos um estudo aprofundado sobre o mapeamento de recursos
virtuais neste ambiente integrado. O estudo centra-se na maximização da
incorporação de recursos virtuais na infraestrutura fĂsica por meio de
estratégias de mapeamento ótimas (considerando a alocação inicial de
recursos, bem como adaptações ao longo do tempo), enquanto que se
minimizam os custos associados ao consumo de energia. Este estudo Ă© feito
para cenários de apenas um domĂnio e para cenários com mĂşltiplos domĂnios.
Além disso, exploramos como o operador de rede pode aproveitar o referido
ambiente integrado para suportar funções de rede tradicionais. Neste sentido,
estudamos como as funções de rede virtualizadas devem ser modeladas e
geridas num ambiente cloud e estendemos a plataforma de acordo com este
conceito.
No âmbito desta Tese foi feita uma avaliação extensa das soluções propostas,
avaliando os seus benefĂcios. Implementámos provas de conceito por forma a
demonstrar as mais-valias, viabilidade e fácil implantação das soluções
propostas. Além disso, a avaliação das estratégias de mapeamento foi
realizada através de ferramentas de simulação e de programação linear inteira,
mostrando que Ă© possĂvel reduzir o consumo de energia da infraestrutura
fĂsica, sem comprometer a aceitação de recursos virtuais. Este aspeto pode
ser melhorado através da adaptação de recursos virtuais ao longo do tempo.
No entanto, deve-se ter em mente os custos associados aos processos de
adaptação. Os custos podem ser minimizados, mas isso implica uma redução
na aceitação de recursos virtuais. Esta compensação foi também um tema
abordado nesta Tese