{"id":50,"date":"2026-05-01T18:29:28","date_gmt":"2026-05-01T16:29:28","guid":{"rendered":"http:\/\/192.168.20.20\/?p=50"},"modified":"2026-05-02T14:06:58","modified_gmt":"2026-05-02T12:06:58","slug":"port-access-et-port-trunk-sur-switch-cisco","status":"publish","type":"post","link":"https:\/\/eryann.fr\/index.php\/cisco\/port-access-et-port-trunk-sur-switch-cisco\/","title":{"rendered":"Fiche port access et port trunk sur switch cisco"},"content":{"rendered":"\n<p>Dans un contexte BTS CIEL ou SIO, la configuration des ports d\u2019un switch est une comp\u00e9tence fondamentale.<br>Elle permet de connecter les \u00e9quipements au r\u00e9seau et de transporter les VLAN entre \u00e9quipements.<\/p>\n\n\n\n<p>L\u2019objectif est de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>comprendre la diff\u00e9rence entre port access et trunk<\/li>\n\n\n\n<li>configurer correctement chaque type de port<\/li>\n\n\n\n<li>s\u00e9curiser les communications<\/li>\n<\/ul>\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=\"683\" height=\"1024\" src=\"http:\/\/192.168.20.20\/wp-content\/uploads\/2026\/05\/image-6-683x1024.png\" alt=\"\" class=\"wp-image-51\" srcset=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-6-683x1024.png 683w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-6-200x300.png 200w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-6-768x1152.png 768w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-6.png 1024w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Configuration compl\u00e8te (copier-coller)<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>#############################################<br># CONFIGURATION PORT ACCESS<br>#############################################<br><br>interface fastEthernet 0\/1<br> description PC_UTILISATEUR<br> switchport mode access<br> switchport access vlan 10<br><br> spanning-tree portfast<br> spanning-tree bpduguard enable<br><br> no shutdown<br><br><br>#############################################<br># CONFIGURATION PORT TRUNK<br>#############################################<br><br>interface fastEthernet 0\/24<br> description TRUNK_VERS_SWITCH<br><br> switchport mode trunk<br> switchport trunk allowed vlan 10,20,30,40,50<br><br> ! VLAN natif (option recommand\u00e9)<br> switchport trunk native vlan 99<br><br> ! S\u00e9curisation du trunk<br> switchport nonegotiate<br><br> no shutdown<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\">Port access<\/h3>\n\n\n\n<p>Un port access est utilis\u00e9 pour connecter un \u00e9quipement final :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PC<\/li>\n\n\n\n<li>imprimante<\/li>\n\n\n\n<li>t\u00e9l\u00e9phone IP<\/li>\n\n\n\n<li>serveur<\/li>\n<\/ul>\n\n\n\n<p>Caract\u00e9ristiques :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>un seul VLAN<\/li>\n\n\n\n<li>trames non tagu\u00e9es<\/li>\n\n\n\n<li>association directe avec un VLAN<\/li>\n<\/ul>\n\n\n\n<p>Commande cl\u00e9 :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>switchport mode access<br>switchport access vlan X<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Port trunk<\/h3>\n\n\n\n<p>Un port trunk est utilis\u00e9 pour relier :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>switch \u2194 switch<\/li>\n\n\n\n<li>switch \u2194 routeur (router-on-a-stick)<\/li>\n<\/ul>\n\n\n\n<p>Caract\u00e9ristiques :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>transporte plusieurs VLAN<\/li>\n\n\n\n<li>utilise le tag 802.1Q<\/li>\n\n\n\n<li>permet la segmentation r\u00e9seau<\/li>\n<\/ul>\n\n\n\n<p>Commande cl\u00e9 :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>switchport mode trunk<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">VLAN natif<\/h3>\n\n\n\n<p>Le VLAN natif correspond aux trames non tagu\u00e9es sur un trunk.<\/p>\n\n\n\n<p>Bonne pratique :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ne pas utiliser VLAN 1<\/li>\n\n\n\n<li>d\u00e9finir un VLAN d\u00e9di\u00e9 (ex : VLAN 99)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">VLAN autoris\u00e9s<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>switchport trunk allowed vlan 10,20,30<\/code><\/pre>\n\n\n\n<p>Permet de limiter les VLAN transport\u00e9s sur le trunk.<\/p>\n\n\n\n<p>Objectif :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>r\u00e9duire la surface d\u2019attaque<\/li>\n\n\n\n<li>am\u00e9liorer la performance<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">S\u00e9curisation<\/h3>\n\n\n\n<p>Port access :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>portfast : activation rapide<\/li>\n\n\n\n<li>bpduguard : protection contre switch non autoris\u00e9<\/li>\n<\/ul>\n\n\n\n<p>Port trunk :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>nonegotiate : d\u00e9sactive DTP<\/li>\n\n\n\n<li>restriction VLAN<\/li>\n\n\n\n<li>VLAN natif d\u00e9di\u00e9<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Comparaison access vs trunk<\/h2>\n\n\n\n<p>Port access :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>un seul VLAN<\/li>\n\n\n\n<li>non tagu\u00e9<\/li>\n\n\n\n<li>utilis\u00e9 pour les postes<\/li>\n<\/ul>\n\n\n\n<p>Port trunk :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>plusieurs VLAN<\/li>\n\n\n\n<li>trames tagu\u00e9es<\/li>\n\n\n\n<li>utilis\u00e9 entre \u00e9quipements r\u00e9seau<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00e9rification<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>show interfaces status<br>show interfaces switchport<br>show vlan brief<br>show interfaces trunk<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Points cl\u00e9s<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>port access pour les \u00e9quipements finaux<\/li>\n\n\n\n<li>port trunk pour interconnexion<\/li>\n\n\n\n<li>toujours limiter les VLAN sur un trunk<\/li>\n\n\n\n<li>ne pas utiliser VLAN 1 en natif<\/li>\n\n\n\n<li>s\u00e9curiser avec bpduguard et nonegotiate<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Suite logique<\/h2>\n\n\n\n<p>Pour compl\u00e9ter cette fiche :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VLAN et segmentation<\/li>\n\n\n\n<li>router-on-a-stick<\/li>\n\n\n\n<li>ACL inter-VLAN<\/li>\n\n\n\n<li>s\u00e9curisation des trunks avanc\u00e9e<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Dans un contexte BTS CIEL ou SIO, la configuration des ports d\u2019un switch est une comp\u00e9tence fondamentale.Elle permet de connecter les \u00e9quipements au r\u00e9seau et de transporter les VLAN entre \u00e9quipements. L\u2019objectif est de : Configuration compl\u00e8te (copier-coller) Explication d\u00e9taill\u00e9e Port access Un port access est utilis\u00e9 pour connecter un \u00e9quipement final : Caract\u00e9ristiques : [&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-50","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 port access et port trunk sur switch cisco - 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\/port-access-et-port-trunk-sur-switch-cisco\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fiche port access et port trunk sur switch cisco - Eryann Breizh SecOps\" \/>\n<meta property=\"og:description\" content=\"Dans un contexte BTS CIEL ou SIO, la configuration des ports d\u2019un switch est une comp\u00e9tence fondamentale.Elle permet de connecter les \u00e9quipements au r\u00e9seau et de transporter les VLAN entre \u00e9quipements. 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