{"id":31,"date":"2026-05-01T17:55:12","date_gmt":"2026-05-01T15:55:12","guid":{"rendered":"http:\/\/192.168.20.20\/?p=31"},"modified":"2026-05-02T16:47:35","modified_gmt":"2026-05-02T14:47:35","slug":"fiche-vlan-router-on-a-stick-roas-3-vlan-utilisateurs-admin-serveur","status":"publish","type":"post","link":"https:\/\/eryann.fr\/index.php\/cisco\/fiche-vlan-router-on-a-stick-roas-3-vlan-utilisateurs-admin-serveur\/","title":{"rendered":"Fiche Cisco VLAN \u201cRouter-on-a-Stick\u201d (RoAS) \u2013 3 VLAN utilisateurs + Admin + Serveur"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Introduction (BTS CIEL \/ SIO)<\/h3>\n\n\n\n<p>En CIEL et SIO, la mise en place de VLANs permet de <strong>segmenter le r\u00e9seau<\/strong>.<br>Le <strong>Router-on-a-Stick (RoAS)<\/strong> consiste \u00e0 utiliser <strong>une seule interface physique du routeur<\/strong> avec des <strong>sous-interfaces 802.1Q<\/strong> pour assurer le routage inter-VLAN.<\/p>\n\n\n\n<p>Objectif : isoler les flux (utilisateurs, admin, serveurs) tout en permettant une communication contr\u00f4l\u00e9e.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"http:\/\/192.168.20.20\/wp-content\/uploads\/2026\/05\/image-3-1024x683.png\" alt=\"\" class=\"wp-image-32\" srcset=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-3-1024x683.png 1024w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-3-300x200.png 300w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-3-768x512.png 768w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-3.png 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Configuration compl\u00e8te (Switch + Routeur)<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>#############################################<br># CONFIGURATION SWITCH (S1)<br>#############################################<br><br>enable<br>configure terminal<br><br>hostname S1<br><br>! ==============================<br>! CREATION DES VLAN<br>! ==============================<br>vlan 10<br> name USERS_1<br>vlan 20<br> name USERS_2<br>vlan 30<br> name USERS_3<br>vlan 40<br> name ADMIN<br>vlan 50<br> name SERVERS<br><br>! ==============================<br>! PORTS UTILISATEURS<br>! ==============================<br>interface range fa0\/1 - 8<br> switchport mode access<br> switchport access vlan 10<br><br>interface range fa0\/9 - 16<br> switchport mode access<br> switchport access vlan 20<br><br>interface range fa0\/17 - 20<br> switchport mode access<br> switchport access vlan 30<br><br>interface range fa0\/21 - 22<br> switchport mode access<br> switchport access vlan 40<br><br>interface range fa0\/23 - 24<br> switchport mode access<br> switchport access vlan 50<br><br>! ==============================<br>! PORT TRUNK VERS ROUTEUR<br>! ==============================<br>interface fa0\/24<br> description TRUNK_VERS_R1<br> switchport mode trunk<br> switchport trunk allowed vlan 10,20,30,40,50<br><br> no shutdown<br><br>end<br>write memory<br><br><br>#############################################<br># CONFIGURATION ROUTEUR (R1)<br>#############################################<br><br>enable<br>configure terminal<br><br>hostname R1<br><br>! ==============================<br>! INTERFACE PHYSIQUE<br>! ==============================<br>interface gigabitEthernet 0\/0<br> no shutdown<br><br>! ==============================<br>! SOUS-INTERFACES (ROAS)<br>! ==============================<br><br>interface gigabitEthernet 0\/0.10<br> encapsulation dot1Q 10<br> ip address 192.168.10.1 255.255.255.0<br><br>interface gigabitEthernet 0\/0.20<br> encapsulation dot1Q 20<br> ip address 192.168.20.1 255.255.255.0<br><br>interface gigabitEthernet 0\/0.30<br> encapsulation dot1Q 30<br> ip address 192.168.30.1 255.255.255.0<br><br>interface gigabitEthernet 0\/0.40<br> encapsulation dot1Q 40<br> ip address 192.168.40.1 255.255.255.0<br><br>interface gigabitEthernet 0\/0.50<br> encapsulation dot1Q 50<br> ip address 192.168.50.1 255.255.255.0<br><br>end<br>write memory<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"> Explication d\u00e9taill\u00e9e<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd39 1. VLANs<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VLAN 10,20,30 \u2192 utilisateurs<\/li>\n\n\n\n<li>VLAN 40 \u2192 administration<\/li>\n\n\n\n<li>VLAN 50 \u2192 serveurs<\/li>\n<\/ul>\n\n\n\n<p>>> segmentation = <strong>r\u00e9duction du risque + meilleure gestion<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd39 2. Ports access (switch)<\/h3>\n\n\n\n<p>Chaque port est associ\u00e9 \u00e0 un VLAN :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>switchport mode access<\/code> \u2192 pas de trunk<\/li>\n\n\n\n<li><code>switchport access vlan X<\/code> \u2192 affectation<\/li>\n<\/ul>\n\n\n\n<p>>> isolation des postes<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd39 3. Trunk vers le routeur<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>switchport mode trunk<\/code><\/li>\n\n\n\n<li><code>switchport trunk allowed vlan ...<\/code><\/li>\n<\/ul>\n\n\n\n<p>>> transport de <strong>plusieurs VLAN sur un seul lien<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd39 4. Router-on-a-Stick<\/h3>\n\n\n\n<p>Chaque VLAN = une sous-interface :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>g0\/0.10<\/code> \u2192 VLAN 10<\/li>\n\n\n\n<li><code>encapsulation dot1Q 10<\/code> \u2192 tag VLAN<\/li>\n\n\n\n<li><code>ip address<\/code> \u2192 passerelle du VLAN<\/li>\n<\/ul>\n\n\n\n<p>>> le routeur devient la <strong>passerelle de tous les VLAN<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd39 5. Fonctionnement global<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>PC VLAN 10 \u2192 envoie vers gateway 192.168.10.1<\/li>\n\n\n\n<li>Trame tagu\u00e9e VLAN 10<\/li>\n\n\n\n<li>Routeur re\u00e7oit \u2192 traite via sous-interface .10<\/li>\n\n\n\n<li>Routage vers VLAN 20<\/li>\n\n\n\n<li>Retour via trunk<\/li>\n<\/ol>\n\n\n\n<p>>> interconnexion propre et centralis\u00e9e<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Points cl\u00e9s s\u00e9curit\u00e9<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VLAN Admin isol\u00e9 (jamais avec utilisateurs)<\/li>\n\n\n\n<li> VLAN Serveurs s\u00e9par\u00e9<\/li>\n\n\n\n<li> limiter VLAN autoris\u00e9s sur trunk<\/li>\n\n\n\n<li> ajouter ACL sur le routeur (\u00e9tape suivante)<\/li>\n\n\n\n<li> d\u00e9sactiver DTP si besoin (<code>nonegotiate<\/code>)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction (BTS CIEL \/ SIO) En CIEL et SIO, la mise en place de VLANs permet de segmenter le r\u00e9seau.Le Router-on-a-Stick (RoAS) consiste \u00e0 utiliser une seule interface physique du routeur avec des sous-interfaces 802.1Q pour assurer le routage inter-VLAN. Objectif : isoler les flux (utilisateurs, admin, serveurs) tout en permettant une communication contr\u00f4l\u00e9e. Configuration [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[4,10],"tags":[3],"class_list":["post-31","post","type-post","status-publish","format-standard","hentry","category-cisco","category-reseau","tag-cisco"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fiche Cisco VLAN \u201cRouter-on-a-Stick\u201d (RoAS) \u2013 3 VLAN utilisateurs + Admin + Serveur - Eryann Breizh SecOps<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/eryann.fr\/index.php\/cisco\/fiche-vlan-router-on-a-stick-roas-3-vlan-utilisateurs-admin-serveur\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fiche Cisco VLAN \u201cRouter-on-a-Stick\u201d (RoAS) \u2013 3 VLAN utilisateurs + Admin + Serveur - Eryann Breizh SecOps\" \/>\n<meta property=\"og:description\" content=\"Introduction (BTS CIEL \/ SIO) En CIEL et SIO, la mise en place de VLANs permet de segmenter le r\u00e9seau.Le Router-on-a-Stick (RoAS) consiste \u00e0 utiliser une seule interface physique du routeur avec des sous-interfaces 802.1Q pour assurer le routage inter-VLAN. 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