{"id":12025,"date":"2023-09-04T07:44:31","date_gmt":"2023-09-03T23:44:31","guid":{"rendered":"https:\/\/www.inhand.com\/?p=12025"},"modified":"2024-08-06T02:17:23","modified_gmt":"2024-08-06T02:17:23","slug":"what-is-ospf","status":"publish","type":"post","link":"https:\/\/www.inhand.com\/fr\/support\/blogs\/what-is-ospf\/","title":{"rendered":"Qu'est-ce que l'Open Shortest Path First (OSPF) ?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"12025\" class=\"elementor elementor-12025\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-302c3ff4 e-flex e-con-boxed e-con e-parent\" data-id=\"302c3ff4\" data-element_type=\"container\" data-settings=\"{&quot;container_type&quot;:&quot;flex&quot;,&quot;content_width&quot;:&quot;boxed&quot;}\" data-core-v316-plus=\"true\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-6bf0ec05 e-con-full e-flex e-con e-child\" data-id=\"6bf0ec05\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;full&quot;,&quot;container_type&quot;:&quot;flex&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-15f15aa5 elementor-widget elementor-widget-heading\" data-id=\"15f15aa5\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.17.0 - 01-11-2023 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h1 class=\"elementor-heading-title elementor-size-default\">Qu'est-ce que l'Open Shortest Path First (OSPF) ?<\/h1>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6cffbfdb e-con-full e-flex e-con e-child\" data-id=\"6cffbfdb\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;full&quot;,&quot;container_type&quot;:&quot;flex&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-61f94e5d elementor-widget elementor-widget-text-editor\" data-id=\"61f94e5d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.17.0 - 01-11-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p><strong>Qu'est-ce que l'OSPF ?<\/strong><\/p><p>OSPF est un protocole de routage \u00e0 \u00e9tat de liaison typique, qui est g\u00e9n\u00e9ralement utilis\u00e9 dans le m\u00eame domaine de routage. Ici, le domaine de routage fait r\u00e9f\u00e9rence \u00e0 un syst\u00e8me autonome (AS), c'est-\u00e0-dire \u00e0 un groupe de r\u00e9seaux qui \u00e9changent des informations de routage par le biais d'une politique ou d'un protocole de routage unifi\u00e9. Dans ce AS, tous les routeurs OSPF maintiennent la m\u00eame base de donn\u00e9es d\u00e9crivant la structure de cet AS, qui stocke les informations sur l'\u00e9tat des liens correspondants dans le domaine de routage. C'est \u00e0 travers cette base de donn\u00e9es que les routeurs OSPF calculent leurs tables de routage OSPF.<\/p><p>En tant que protocole de routage \u00e0 \u00e9tat de liens, OSPF transmet les donn\u00e9es de multidiffusion \u00e0 \u00e9tat de liens LSA ( lien status advertisement) \u00e0 tous les routeurs d'une certaine zone, ce qui est diff\u00e9rent du protocole de routage \u00e0 vecteur de distance. Les routeurs utilisant le protocole de routage \u00e0 vecteur de distance transmettent une partie ou la totalit\u00e9 des tables de routage \u00e0 leurs voisins.<\/p><p>En ce qui concerne la s\u00e9curit\u00e9 de l'\u00e9change d'informations, l'OSPF stipule que tout \u00e9change d'informations entre les routeurs peut \u00eatre authentifi\u00e9 si n\u00e9cessaire, afin de garantir que seuls les routeurs de confiance peuvent diffuser des informations de routage. OSPF supporte une vari\u00e9t\u00e9 de m\u00e9canismes d'authentification et permet l'adoption de diff\u00e9rents m\u00e9canismes d'authentification dans diff\u00e9rentes zones. L'application de l'algorithme d'\u00e9tat de liaison OSPF dans un r\u00e9seau de diffusion (tel qu'Ethernet) est optimis\u00e9e afin d'utiliser au mieux la capacit\u00e9 de diffusion du mat\u00e9riel pour d\u00e9livrer les messages d'\u00e9tat de liaison. En g\u00e9n\u00e9ral, un n\u0153ud dans le diagramme topologique de l'algorithme d'\u00e9tat des liens repr\u00e9sente un routeur. Si les k routeurs sont tous connect\u00e9s \u00e0 Ethernet, lorsque l'\u00e9tat du lien est diffus\u00e9, le nombre de messages concernant ces k routeurs atteindra k carr\u00e9s. Par cons\u00e9quent, OSPF permet \u00e0 un n\u0153ud de repr\u00e9senter un r\u00e9seau de diffusion dans le diagramme topologique. Tous les routeurs de chaque r\u00e9seau de diffusion envoient des messages d'\u00e9tat de liaison pour signaler l'\u00e9tat de liaison des routeurs du r\u00e9seau.<\/p><p><span style=\"font-size: inherit; text-align: inherit; font-family: var( --e-global-typography-text-font-family ), Sans-serif; font-weight: var( --e-global-typography-text-font-weight ); background-color: var(--palettecolor8); color: var(--color); font-style: var(--fontStyle, inherit); letter-spacing: var(--letterSpacing); text-transform: var(--textTransform);\">\u00a0<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-bd0467d e-con-full e-flex e-con e-child\" data-id=\"bd0467d\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;full&quot;,&quot;container_type&quot;:&quot;flex&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fbc0833 elementor-widget elementor-widget-text-editor\" data-id=\"fbc0833\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>Principe de fonctionnement<\/strong><\/p><p>Pour simplifier, l'OSPF signifie que deux routeurs adjacents deviennent voisins en envoyant des messages, puis que les voisins s'envoient des informations sur l'\u00e9tat des liens pour former une relation d'adjacence. Ensuite, chaque routeur calcule une route selon l'algorithme de la route la plus courte et la place dans la table de routage OSPF. Compar\u00e9es \u00e0 d'autres routes, les routes OSPF sont mieux ajout\u00e9es \u00e0 la table de routage globale. L'ensemble du processus utilise cinq types de messages, trois \u00e9tapes et quatre tables.<\/p><p><strong>Cinq types de messages<\/strong><\/p><p>Message de bienvenue : \u00c9tablir et maintenir une relation de voisinage.<\/p><p>Message DBD : envoie des informations d'en-t\u00eate sur l'\u00e9tat de la liaison.<\/p><p>Message LSR : Envoyer aux voisins les informations d'en-t\u00eate d'\u00e9tat de liaison obtenues par le DBD et demander des informations compl\u00e8tes.<\/p><p>Message LSU : envoyer aux voisins des informations compl\u00e8tes correspondant aux informations d'en-t\u00eate de la demande LSR.<\/p><p>LSACK : confirmer le message LSU apr\u00e8s l'avoir re\u00e7u.<\/p><p><strong>Trois \u00e9tapes<\/strong><\/p><p>D\u00e9couverte du voisin : La relation de voisinage est \u00e9tablie par l'envoi d'un message de bienvenue.<\/p><p>Annonce de la route : Les voisins envoient des informations sur l'\u00e9tat des liens pour \u00e9tablir une relation d'adjacence.<\/p><p>Calcul : Calculer la table de routage selon l'algorithme de la route la plus courte.<\/p><p><strong>Quatre tables<br \/><\/strong><\/p><p>Table des voisins : elle enregistre principalement les routeurs qui entretiennent des relations de voisinage.<\/p><p>Base de donn\u00e9es de l'\u00e9tat des liens : enregistre les informations relatives \u00e0 l'\u00e9tat des liens.<\/p><p>Table de routage : obtenue de la base de donn\u00e9es de l'\u00e9tat des liens.<\/p><p>Table de routage globale : Le routage OSPF est compar\u00e9 aux autres.<\/p><p>\u00a0<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4dc21528 e-flex e-con-boxed e-con e-child\" data-id=\"4dc21528\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;container_type&quot;:&quot;flex&quot;,&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5c7efff0 e-con-full e-flex e-con e-child\" data-id=\"5c7efff0\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;full&quot;,&quot;container_type&quot;:&quot;flex&quot;}\">\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4ac4d1fd e-con-full e-flex e-con e-child\" data-id=\"4ac4d1fd\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;full&quot;,&quot;container_type&quot;:&quot;flex&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-687edd4e e-con-full e-flex e-con e-child\" data-id=\"687edd4e\" data-element_type=\"container\" data-settings=\"{&quot;sticky&quot;:&quot;top&quot;,&quot;sticky_offset&quot;:60,&quot;content_width&quot;:&quot;full&quot;,&quot;sticky_offset_tablet&quot;:0,&quot;sticky_offset_mobile&quot;:0,&quot;sticky_parent&quot;:&quot;yes&quot;,&quot;container_type&quot;:&quot;flex&quot;,&quot;sticky_on&quot;:[&quot;desktop&quot;,&quot;tablet&quot;,&quot;mobile&quot;],&quot;sticky_effects_offset&quot;:0}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-64684b14 elementor-widget elementor-widget-heading\" data-id=\"64684b14\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Blogs Associ\u00e9s<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a756fb elementor-widget elementor-widget-ha-post-list happy-addon ha-post-list\" data-id=\"7a756fb\" data-element_type=\"widget\" data-widget_type=\"ha-post-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t<div class=\"ha-post-list-wrapper\">\n\t\t\t\t<ul class=\"ha-post-list\" >\n\t\t\t\t\t\t\t\t\t\t\t<li class=\"ha-post-list-item\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/www.inhand.com\/fr\/support\/blogs\/why-do-we-need-routing-protocols\/\">\n\t\t\t\t\t\t\t\t<span class=\"ha-post-list-icon\"><i aria-hidden=\"true\" class=\"hm hm-tb-post-content\"><\/i><\/span>\t\t\t\t\t\t\t\t<div class=\"ha-post-list-content\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"ha-post-list-title\">Pourquoi avons-nous besoin du protocole de routage ?<\/h2>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t\t\t\t<li class=\"ha-post-list-item\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/www.inhand.com\/fr\/support\/blogs\/what-is-ipv6\/\">\n\t\t\t\t\t\t\t\t<span class=\"ha-post-list-icon\"><i aria-hidden=\"true\" class=\"hm hm-tb-post-content\"><\/i><\/span>\t\t\t\t\t\t\t\t<div class=\"ha-post-list-content\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"ha-post-list-title\">Qu&#039;est-ce que l&#039;IPv6 ? Pourquoi choisissons-nous de l&#039;utiliser ?<\/h2>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t\t\t\t<li class=\"ha-post-list-item\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/www.inhand.com\/fr\/support\/blogs\/what-is-a-ping\/\">\n\t\t\t\t\t\t\t\t<span class=\"ha-post-list-icon\"><i aria-hidden=\"true\" class=\"hm hm-tb-post-content\"><\/i><\/span>\t\t\t\t\t\t\t\t<div class=\"ha-post-list-content\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"ha-post-list-title\">Qu&#039;est-ce qu&#039;un ping et comment fonctionne-t-il ?<\/h2>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t\t\t\t<li class=\"ha-post-list-item\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/www.inhand.com\/fr\/support\/blogs\/why-use-vrrp-technology\/\">\n\t\t\t\t\t\t\t\t<span class=\"ha-post-list-icon\"><i aria-hidden=\"true\" class=\"hm hm-tb-post-content\"><\/i><\/span>\t\t\t\t\t\t\t\t<div class=\"ha-post-list-content\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"ha-post-list-title\">Pourquoi utiliser la technologie VRRP ?<\/h2>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t\t\t\t<li class=\"ha-post-list-item\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/www.inhand.com\/fr\/support\/blogs\/differences-in-wireless-communication-technologies\/\">\n\t\t\t\t\t\t\t\t<span class=\"ha-post-list-icon\"><i aria-hidden=\"true\" class=\"hm hm-tb-post-content\"><\/i><\/span>\t\t\t\t\t\t\t\t<div class=\"ha-post-list-content\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"ha-post-list-title\">Quelles sont les diff\u00e9rences entre les technologies des r\u00e9seaux de communication sans fil ?<\/h2>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t\t<\/ul>\n\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-450778a1 e-flex e-con-boxed e-con e-parent\" data-id=\"450778a1\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;container_type&quot;:&quot;flex&quot;,&quot;content_width&quot;:&quot;boxed&quot;}\" data-core-v316-plus=\"true\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7ef50058 elementor-widget elementor-widget-ucaddon_uc_card_post_carousel\" data-id=\"7ef50058\" data-element_type=\"widget\" data-widget_type=\"ucaddon_uc_card_post_carousel.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\n<!-- start Post Carousel Lite 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!important;\ntext-align:center;\n}\n\n#uc_uc_card_post_carousel_elementor_7ef50058 .owl-dot {\nborder-radius:50%;\ndisplay:inline-block;\n}\n\n<\/style>\n\n<div class=\"uc_overlay_image_carousel\" id=\"uc_uc_card_post_carousel_elementor_7ef50058\" data-custom-sethtml=\"true\" >\n   <div class=\"uc_carousel owl-carousel owl-theme uc-items-wrapper\">\n   \t\t<div id=\"uc_uc_card_post_carousel_elementor_7ef50058_item1\" class=\"uc_image_carousel_container_holder ue_post_carousel_item ue-Blogs\">\n  <div class=\"uc_image_carousel_placeholder\">\n    <a href=\"https:\/\/www.inhand.com\/fr\/support\/blogs\/new-5g-router-cr602-helps-coffee-shops-improve-connectivity-and-business-internet-reliability\/\"><div calss=\"uc_image_carousel_bg\" style=\"background-image:url(https:\/\/www.inhand.com\/wp-content\/uploads\/\u5c01\u9762-2-768x563.png); background-size:cover; background-position:center; height:200px;\"><\/div><\/a>\n  <\/div>\n\n  <div class=\"uc_image_carousel_content\" >\n                <a href=\"https:\/\/www.inhand.com\/fr\/support\/blogs\/new-5g-router-cr602-helps-coffee-shops-improve-connectivity-and-business-internet-reliability\/\" style=\"text-decoration:none;\"><div class=\"uc_post_title\" style=\"text-decoration:none;\">Le nouveau routeur 5G CR602 aide les caf\u00e9s \u00e0 am\u00e9liorer leur connectivit\u00e9 et la fiabilit\u00e9 de leur connexion Internet professionnelle.<\/div><\/a>    <div class=\"ue_post_intro\">Assurez une connexion internet professionnelle fiable \u00e0 votre caf\u00e9 gr\u00e2ce au routeur 5G CR602. 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Comment fonctionne-t-il ? En savoir plus ici !<\/p>","protected":false},"author":1,"featured_media":32208,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[126],"tags":[],"class_list":["post-12025","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"blocksy_meta":"","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.1 (Yoast SEO v23.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Open Shortest Path First (OSPF)? - InHand Networks<\/title>\n<meta name=\"description\" content=\"Understand OSPF, a link-state routing protocol. 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