{"id":38214,"date":"2019-10-31T22:22:20","date_gmt":"2019-10-31T19:22:20","guid":{"rendered":"https:\/\/prohoster.info\/blog\/trening-cisco-200-125-ccna-v3-0-den-43-protokoly-marshrutizatsii-distance-vector-i-link-state\/"},"modified":"2019-10-31T22:22:20","modified_gmt":"2019-10-31T19:22:20","slug":"trening-cisco-200-125-ccna-v3-0-den-43-protokoly-marshrutizatsii-distance-vector-i-link-state","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/trening-cisco-200-125-ccna-v3-0-den-43-protokoly-marshrutizatsii-distance-vector-i-link-state","title":{"rendered":"Treinamento Cisco 200-125 CCNA v3.0. Dia 43. Protocolos de roteamento Distance Vector e Link State","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A video lesson today on Distance Vector and Link State routing protocols precedes one of the most important topics of the CCNA course \u2013 OSPF and EIGRP routing protocols. This topic will take 4 or even 6 upcoming video lessons. Therefore, today I will briefly discuss a few concepts you need to know before starting to study OSPF and EIGRP.<\/p>\n<p><img decoding=\"async\" alt=\"Treinamento Cisco 200-125 CCNA v3.0. Dia 43. Protocolos de roteamento Distance Vector e Link State\" src=\"\/wp-content\/uploads\/2019\/09\/ea673b4bf02526ded8e854f6d1dfd80f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nIn the last lesson, we covered section 2.1 of the ICND2 topic, and today we will study sections 2.2 \"Similarities and Differences Between Distance Vector (DV) Routing Protocols and Link State (LS) Routing Protocols\" and 2.3 \"Similarities and Differences Between Internal and External Routing Protocols.\" <noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>As I mentioned, in the next 4 or 6 videos we will address the key issues of the entire course \u2013 OSPFv2 protocols for IPv4, OSPFv3 for IPv6, EIGRP for IPv4, and EIGRP for IPv6. Students often ask me what a routing protocol is and how it differs from a routed\/routable protocol. <\/p>\n<p>A routing protocol is used by a router, such as RIP, EIGRP, OSPF, BGP, and others. A routing protocol is a way for routers to communicate with each other, exchanging information about the network and populating their routing tables with this information. Based on these tables, they make routing decisions. <\/p>\n<p>Once routers have \"communicated\" with each other and populated their routing tables, all done using the routing protocol, they make decisions on sending traffic to other networks. This involves using a routed protocol, which allows routers to forward or route traffic. These protocols include IPv4 and IPv6. <\/p>\n<p><img decoding=\"async\" alt=\"Treinamento Cisco 200-125 CCNA v3.0. Dia 43. Protocolos de roteamento Distance Vector e Link State\" src=\"\/wp-content\/uploads\/2019\/09\/8a321ec62ba6f5c82934d8ba03091d2a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nThus, the routing protocol ensures that routing tables are populated with information, while the routed protocol ensures the routing of traffic according to the information in these tables. Thanks to IPv4 or IPv6, the data being transmitted is encapsulated and provided with IP headers, as indicated by the names of these protocols \u2013 IP. <\/p>\n<p>A pr\u00f3xima quest\u00e3o diz respeito \u00e0s diferen\u00e7as entre os protocolos de Gateway Interno (Interior Gateway Protocol) e os protocolos de Gateway Externo (Exterior Gateway Protocol). N\u00e3o se deixe enganar pela palavra \"gateway\". Normalmente, os roteadores s\u00e3o usados em um sistema aut\u00f4nomo. Suponha que voc\u00ea tenha 50 roteadores em sua empresa, utilizando qualquer protocolo IP. Todos eles formam um sistema aut\u00f4nomo, ou seja, s\u00e3o usados e administrados por uma \u00fanica empresa, uma \u00fanica organiza\u00e7\u00e3o. <\/p>\n<p><img decoding=\"async\" alt=\"Treinamento Cisco 200-125 CCNA v3.0. Dia 43. Protocolos de roteamento Distance Vector e Link State\" src=\"\/wp-content\/uploads\/2019\/09\/ce51162ae1a46ab695cd99240977486a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPortanto, os protocolos utilizados para garantir o roteamento dentro de um sistema aut\u00f4nomo s\u00e3o chamados de protocolos de gateway interno, enquanto os protocolos utilizados para roteamento fora do sistema s\u00e3o chamados de protocolos de gateway externo. O protocolo de gateway externo garante o roteamento entre diferentes sistemas aut\u00f4nomos. Um desses sistemas pode ser o seu provedor de ISP, e seu sistema pode ser composto por 200 roteadores. Para se comunicarem entre si, os sistemas aut\u00f4nomos utilizam o protocolo de gateway externo. <\/p>\n<p>Os protocolos de gateway interno incluem RIP, OSPF, EIGRP, e atualmente, para protocolo de gateway externo, apenas um protocolo \u00e9 utilizado: BGP. <\/p>\n<p>As pr\u00f3ximas duas defini\u00e7\u00f5es que voc\u00ea deve entender s\u00e3o Distance Vector e Link State. Estes s\u00e3o dois tipos de protocolos de roteamento de gateway interno. <\/p>\n<p><img decoding=\"async\" alt=\"Treinamento Cisco 200-125 CCNA v3.0. Dia 43. Protocolos de roteamento Distance Vector e Link State\" src=\"\/wp-content\/uploads\/2019\/09\/20560cb6502d5c49ed42800839bea86c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSuponha que temos 3 roteadores interconectados entre si e \u00e0 rede 192.168.10.0\/24. Vamos cham\u00e1-los de A, B e C. Do curso ICND1, sabemos o que acontece ao usar o RIP. <\/p>\n<p>Como o roteador B est\u00e1 mais pr\u00f3ximo da rede 192.168.10.0\/24, ele \u00e9 o primeiro a enviar um an\u00fancio sobre essa rede para o roteador A e o roteador C. O roteador C tamb\u00e9m repassa esse an\u00fancio para o roteador A. O roteador A recebe informa\u00e7\u00f5es sobre a rede 192.168.10.0\/24 atrav\u00e9s de suas duas interfaces \u2013 f0\/0 e f0\/1. Como o protocolo RIPv2 utiliza a m\u00e9trica Hop Count, ele informar\u00e1 ao roteador que a rota ideal para acessar essa rede \u00e9 atrav\u00e9s do roteador B, pois assim a rede pode ser alcan\u00e7ada em um salto. Se utilizar a interface f0\/1 para se conectar \u00e0 rede 192.168.10.0\/24, ser\u00e3o necess\u00e1rios 2 saltos. Assim, do ponto de vista do roteador A, o ideal ser\u00e1 usar a interface f0\/0. Essa decis\u00e3o \u00e9 tomada pelo A porque ele usa o RIP, que \u00e9 um protocolo de vetor de dist\u00e2ncia. <\/p>\n<p>De acordo com o esquema apresentado, vemos que esta \u00e9 a solu\u00e7\u00e3o correta, pois a dist\u00e2ncia entre A e B \u00e9 a mais curta. Mas o que acontecer\u00e1 se eu disser que entre A e B existe uma linha com capacidade de 64 kbit\/s, enquanto entre C e B h\u00e1 uma linha de 100 Mbit\/s, e uma linha id\u00eantica est\u00e1 situada entre C e A? <\/p>\n<p>Qual rota ser\u00e1 a mais otimizada nessas condi\u00e7\u00f5es? <\/p>\n<p><img decoding=\"async\" alt=\"Treinamento Cisco 200-125 CCNA v3.0. Dia 43. Protocolos de roteamento Distance Vector e Link State\" src=\"\/wp-content\/uploads\/2019\/09\/27c18f5a95e45b9dab7c851314102adb.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nCertamente, a linha de 100 megabits por segundo \u00e9 muito melhor do que a linha de 64 kilobits por segundo, mesmo que a rota atrav\u00e9s dela leve 2 saltos em vez de um. No entanto, o protocolo de vetor de dist\u00e2ncia RIP n\u00e3o considera a velocidade de transfer\u00eancia de tr\u00e1fego, pois ao escolher a rota otimizada, \u00e9 guiado pelo n\u00famero m\u00ednimo de saltos. Nesse caso, \u00e9 melhor utilizar um protocolo de estado de enlace, como o OSPF. Este protocolo verifica o custo das rotas e, ao encontrar a mais \"barata\", encaminha o tr\u00e1fego pelo caminho roteador A \u2013 roteador C \u2013 roteador B. <\/p>\n<p>Em compara\u00e7\u00e3o com o RIP, o protocolo OSPF \u00e9 muito mais complexo, pois leva em conta diversos fatores ao determinar a rota otimizada e encontra o caminho mais curto em termos de m\u00e9trica. <br \/>\nO EIGRP foi outrora um protocolo de roteamento propriet\u00e1rio da Cisco, mas agora \u00e9 um padr\u00e3o aberto. \u00c9 uma combina\u00e7\u00e3o das melhores propriedades do protocolo de vetor de dist\u00e2ncia e do protocolo de estado de enlace. Ele considera tanto a largura de banda quanto as lat\u00eancias da rede. Como sabemos, quanto mais longo for o caminho, ou seja, quanto mais saltos, maiores ser\u00e3o as lat\u00eancias. Portanto, o protocolo EIGRP escolhe a rota com a maior largura de banda e a menor lat\u00eancia total, comparando as m\u00e9tricas das rotas. A largura de banda e as lat\u00eancias mostradas s\u00e3o partes da f\u00f3rmula na qual a decis\u00e3o de roteamento \u00e9 baseada. <br \/>\nEssa \u00e9 a diferen\u00e7a entre os protocolos de vetor de dist\u00e2ncia e os de estado de enlace. Os protocolos de vetor de dist\u00e2ncia consideram apenas a dist\u00e2ncia da rota, enquanto os protocolos de estado de enlace analisam o estado da rede ao longo do caminho da rota, como a velocidade e a largura de banda. <br \/>\nO EIGRP \u00e9 um protocolo de roteamento h\u00edbrido, pois combina caracter\u00edsticas de ambos os protocolos mencionados. Do ponto de vista da Cisco, este \u00e9 o melhor protocolo de roteamento, por isso \u00e9 o preferido por todos os engenheiros da empresa; no entanto, o protocolo mais amplamente utilizado no mundo \u00e9 o OSPF. A raz\u00e3o para isso \u00e9 que o EIGRP se tornou um padr\u00e3o aberto apenas recentemente, ent\u00e3o os fabricantes de terceiros n\u00e3o t\u00eam certeza sobre sua compatibilidade com seu equipamento de rede. <\/p>\n<p>Vamos considerar o que \u00e9 o grau de confian\u00e7a em um protocolo. Quando o roteador A recebe informa\u00e7\u00f5es de rota de duas fontes diferentes, ele usa uma f\u00f3rmula para decidir qual dos dois caminhos incluir na tabela de roteamento. Isso \u00e9 simples, pois ele analisa os par\u00e2metros do caminho B-A e A-C-B, compara-os e toma a decis\u00e3o \u00f3tima. Claro que o OSPF tamb\u00e9m faz balanceamento de carga, ou seja, se duas rotas tiverem o mesmo custo, ele realiza o balanceamento de carga. Vamos abordar esse assunto em detalhes nos pr\u00f3ximos v\u00eddeos; hoje, s\u00f3 quero que voc\u00eas tenham conhecimento sobre isso. <\/p>\n<p>Vamos analisar a tabela a seguir. Abaixo, desenharei novamente os roteadores A, B e C, que formam um sistema aut\u00f4nomo de rede em sua empresa. Suponha que sua empresa adquiriu outra empresa, que possui um sistema com os roteadores A1, B1 e C1. Agora, voc\u00ea tem duas empresas, cada uma com sua rede. Suponha que a primeira utilize o protocolo EIGRP, enquanto a segunda utilize o OSPF. <\/p>\n<p><img decoding=\"async\" alt=\"Treinamento Cisco 200-125 CCNA v3.0. Dia 43. Protocolos de roteamento Distance Vector e Link State\" src=\"\/wp-content\/uploads\/2019\/09\/53e0cbe644dd095f1f4d33561fdae127.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nClaro, \u00e9 poss\u00edvel reconfigurar sua rede para usar OSPF ou transferir a rede da empresa que voc\u00ea adquiriu para o protocolo EIGRP, mas isso envolve muito trabalho administrativo. Para uma empresa pequena, isso pode ser gerenci\u00e1vel, mas se a empresa for grande, ser\u00e1 uma quantidade enorme de trabalho. Nesse caso, pode-se fazer uma redistribui\u00e7\u00e3o, ou seja, pegar as rotas EIGRP e distribu\u00ed-las pelo OSPF, enquanto as rotas OSPF s\u00e3o redistribu\u00eddas pelo EIGRP. Isso \u00e9 totalmente vi\u00e1vel. Para isso, um dos roteadores da sua empresa deve operar com os dois protocolos \u2013 EIGRP e OSPF, suponha que seja o roteador B. Ele conter\u00e1 uma tabela de roteamento, onde parte das rotas \u00e9 obtida do EIGRP e parte do OSPF. Suponhamos que temos outra rede \u00e0 qual ambas as empresas est\u00e3o conectadas. Nesse caso, a primeira empresa usar\u00e1 as rotas da tabela EIGRP para se comunicar com ela, enquanto a segunda usar\u00e1 as rotas do protocolo OSPF, e ser\u00e1 muito dif\u00edcil alinhar essas rotas obtidas de diferentes fontes, porque cada uma escolhe a rota otimizada com base em suas pr\u00f3prias m\u00e9tricas. <\/p>\n<p><img decoding=\"async\" alt=\"Treinamento Cisco 200-125 CCNA v3.0. Dia 43. Protocolos de roteamento Distance Vector e Link State\" src=\"\/wp-content\/uploads\/2019\/09\/1f31399dd5f1b3e7eba9792e08a0eb0b.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNesse caso, utiliza-se o conceito de Dist\u00e2ncia Administrativa. Ela ajuda o roteador a escolher a rota mais otimizada entre v\u00e1rias rotas obtidas de diferentes protocolos de roteamento. Por exemplo, se o roteador B est\u00e1 diretamente conectado ao roteador C, a dist\u00e2ncia administrativa ser\u00e1 igual a 0, e essa \u00e9 a rota mais confi\u00e1vel. Suponha que o A informe ao B que tamb\u00e9m tem acesso ao C, nesse caso, o roteador B responder\u00e1: \u201cobrigado pela sua informa\u00e7\u00e3o, mas o roteador C est\u00e1 conectado a mim diretamente, ent\u00e3o escolho a op\u00e7\u00e3o com menor dist\u00e2ncia administrativa, e n\u00e3o a op\u00e7\u00e3o de conex\u00e3o atrav\u00e9s de voc\u00ea.\u201d <\/p>\n<p>A dist\u00e2ncia administrativa indica o grau de confian\u00e7a no protocolo. Quanto menor o valor da dist\u00e2ncia administrativa, maior a confian\u00e7a. A pr\u00f3xima op\u00e7\u00e3o mais confi\u00e1vel ap\u00f3s a conex\u00e3o direta \u00e9 a conex\u00e3o est\u00e1tica com uma dist\u00e2ncia administrativa igual a 1. O n\u00edvel de confian\u00e7a no protocolo EIGRP \u00e9 caracterizado pelo valor de dist\u00e2ncia administrativa de 90, no protocolo OSPF \u00e9 110 e no protocolo RIP \u00e9 120. <\/p>\n<p>Portanto, se tanto o EIGRP quanto o OSPF representarem a mesma rede, o roteador confiar\u00e1 nas informa\u00e7\u00f5es de rotas recebidas do EIGRP, uma vez que este protocolo possui uma dist\u00e2ncia administrativa de 90, que \u00e9 menor do que a do OSPF.<\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"Sg2_Zq4Ngck\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/Sg2_Zq4Ngck\/hqdefault.jpg\" alt=\"Por que no hosting comum a administra\u00e7\u00e3o do PrestaShop \u00e9 lenta, e no seu n\u00e3o \u00e9?\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><br \/>\nObrigado por estar conosco. Voc\u00ea gosta dos nossos artigos? 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Apoie-nos fazendo um pedido ou recomendando a amigos, <b>30% de desconto para usu\u00e1rios do Habra em um an\u00e1logo \u00fanico de servidores de entrada, que foi desenvolvido para voc\u00ea:<\/b> <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/ua-hosting\/blog\/347386\/\">Toda a verdade sobre VPS (KVM) E5-2650 v4 (6 Cores) 10GB DDR4 240GB SSD 1Gbps a partir de $20 ou como dividir o servidor corretamente?<\/a><\/noindex> (dispon\u00edveis op\u00e7\u00f5es com RAID1 e RAID10, at\u00e9 24 n\u00facleos e at\u00e9 40GB DDR4).<\/p>\n<p><b>Dell R730xd pela metade do pre\u00e7o?<\/b> Somente conosco <b><noindex><a rel=\"nofollow\" href=\"https:\/\/ua-hosting.company\/serversnl\">2 x Intel TetraDeca-Core Xeon 2x E5-2697v3 2.6GHz 14C 64GB DDR4 4x960GB SSD 1Gbps 100TB a partir de $199<\/a><\/noindex> na Holanda! <b>Dell R420 \u2014 2x E5-2430 2.2Ghz 6C 128GB DDR3 2x960GB SSD 1Gbps 100TB \u2014 a partir de $99!<\/b><\/b> Leia sobre <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/ua-hosting\/blog\/329618\/\">Como construir uma infraestrutura de classe corporativa utilizando servidores Dell R730xd E5-2650 v4 com custo de 9000 euros por centavos?<\/a><\/noindex><br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ua-hosting\/blog\/466437\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0435\u0433\u043e\u0434\u043d\u044f\u0448\u043d\u0438\u0439 \u0432\u0438\u0434\u0435\u043e\u0443\u0440\u043e\u043a \u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u0445 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u0438 Distance Vector \u0438 Link State \u043f\u0440\u0435\u0434\u0432\u0430\u0440\u044f\u0435\u0442 \u043e\u0434\u043d\u0443 \u0438\u0437 \u0441\u0430\u043c\u044b\u0445 \u0432\u0430\u0436\u043d\u044b\u0445 \u0442\u0435\u043c \u043a\u0443\u0440\u0441\u0430 CCNA \u2013 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u044b \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u0438 OSPF \u0438 EIGRP. \u042d\u0442\u0430 \u0442\u0435\u043c\u0430 \u0437\u0430\u0439\u043c\u0435\u0442 4 \u0438\u043b\u0438 \u0434\u0430\u0436\u0435 6 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0445 \u0432\u0438\u0434\u0435\u043e\u0443\u0440\u043e\u043a\u043e\u0432. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0441\u0435\u0433\u043e\u0434\u043d\u044f \u044f \u043a\u0440\u0430\u0442\u043a\u043e \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0443 \u043e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u043a\u043e\u043d\u0446\u0435\u043f\u0446\u0438\u044f\u0445, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043d\u0443\u0436\u043d\u043e \u0437\u043d\u0430\u0442\u044c, \u043f\u0440\u0435\u0436\u0434\u0435 \u0447\u0435\u043c \u043d\u0430\u0447\u0430\u0442\u044c \u0438\u0437\u0443\u0447\u0430\u0442\u044c OSPF \u0438 EIGRP. \u041d\u0430 \u043f\u0440\u043e\u0448\u043b\u043e\u043c \u0443\u0440\u043e\u043a\u0435 \u043c\u044b [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":28685,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-38214","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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