{"id":2976,"date":"2021-01-27T16:12:11","date_gmt":"2021-01-28T00:12:11","guid":{"rendered":"https:\/\/SUMMALAI.COM\/?p=2976"},"modified":"2021-01-27T16:12:13","modified_gmt":"2021-01-28T00:12:13","slug":"how-to-configure-allowed-vlans-on-cisco-trunk","status":"publish","type":"post","link":"https:\/\/SUMMALAI.COM\/?p=2976","title":{"rendered":"How to Configure Allowed VLANs on Cisco Trunk"},"content":{"rendered":"\n<p>By default, all VLANs are allowed across the trunk link. We can verify that using the&nbsp;<em>show interfaces trunk<\/em>&nbsp;command:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/geek-university.com\/wp-content\/uploads\/2015\/10\/show_interfaces_trunk.jpg\"><img decoding=\"async\" src=\"https:\/\/geek-university.com\/wp-content\/uploads\/2015\/10\/show_interfaces_trunk.jpg\" alt=\"show interfaces trunk\" class=\"wp-image-5162\"\/><\/a><\/figure>\n\n\n\n<p>You can prevent traffic from certain VLANs from traversing a trunked link using the following interface mode command:<\/p>\n\n\n\n<p><em>switchport trunk allowed vlan {add | all | except | remove} vlan-list<\/em><\/p>\n\n\n\n<p>For example, to prevent traffic from VLAN 5 to traverse the trunk link, you can use the following command:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/geek-university.com\/wp-content\/uploads\/2015\/10\/switchport_trunk_allowed_vlan_remove_command.jpg\"><img decoding=\"async\" src=\"https:\/\/geek-university.com\/wp-content\/uploads\/2015\/10\/switchport_trunk_allowed_vlan_remove_command.jpg\" alt=\"switchport trunk allowed vlan remove command\" class=\"wp-image-5168\"\/><\/a><\/figure>\n\n\n\n<p>To verify that the traffic from VLAN 5 will indeed be blocked from traversing a trunked link, use the&nbsp;<em>show interfaces trunk<\/em>&nbsp;command again:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/geek-university.com\/wp-content\/uploads\/2015\/10\/show_interfaces_trunk_command.jpg\"><img decoding=\"async\" src=\"https:\/\/geek-university.com\/wp-content\/uploads\/2015\/10\/show_interfaces_trunk_command.jpg\" alt=\"show interfaces trunk command\" class=\"wp-image-5163\"\/><\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>By default, all VLANs are allowed across the trunk link. We can verify that using the&nbsp;show interfaces trunk&nbsp;command: You can prevent traffic from certain VLANs from traversing a trunked link using the following interface mode command: switchport trunk allowed vlan {add | all | except | remove} vlan-list For example, to prevent traffic from VLAN <a class=\"read-more\" href=\"https:\/\/SUMMALAI.COM\/?p=2976\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[9,19],"tags":[570],"class_list":["post-2976","post","type-post","status-publish","format-standard","hentry","category-networks","category-router-switch","tag-configure-allowed-vlan"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"By default, all VLANs are allowed across the trunk link. We can verify that using the show interfaces trunk command: You can prevent traffic from certain VLANs from traversing a trunked link using the following interface mode command: switchport trunk allowed vlan {add | all | except | remove} vlan-list For example, to prevent traffic from VLAN\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Summa Lai\"\/>\n\t<meta name=\"keywords\" content=\"configure allowed vlan,networks,router\/switch\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/SUMMALAI.COM\/?p=2976\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.9\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976#article\",\"name\":\"How to Configure Allowed VLANs on Cisco Trunk | Summa Lai\",\"headline\":\"How to Configure Allowed VLANs on Cisco Trunk\",\"author\":{\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?author=2#author\"},\"publisher\":{\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/#person\"},\"image\":{\"@type\":\"ImageObject\",\"url\":\"https:\\\/\\\/geek-university.com\\\/wp-content\\\/uploads\\\/2015\\\/10\\\/show_interfaces_trunk.jpg\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976\\\/#articleImage\"},\"datePublished\":\"2021-01-27T16:12:11-08:00\",\"dateModified\":\"2021-01-27T16:12:13-08:00\",\"inLanguage\":\"en-US\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976#webpage\"},\"isPartOf\":{\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976#webpage\"},\"articleSection\":\"Networks, Router\\\/Switch, Configure Allowed VLAN\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/SUMMALAI.COM\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?cat=9#listItem\",\"name\":\"Networks\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?cat=9#listItem\",\"position\":2,\"name\":\"Networks\",\"item\":\"https:\\\/\\\/SUMMALAI.COM\\\/?cat=9\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?cat=19#listItem\",\"name\":\"Router\\\/Switch\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?cat=19#listItem\",\"position\":3,\"name\":\"Router\\\/Switch\",\"item\":\"https:\\\/\\\/SUMMALAI.COM\\\/?cat=19\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976#listItem\",\"name\":\"How to Configure Allowed VLANs on Cisco Trunk\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?cat=9#listItem\",\"name\":\"Networks\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976#listItem\",\"position\":4,\"name\":\"How to Configure Allowed VLANs on Cisco Trunk\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?cat=19#listItem\",\"name\":\"Router\\\/Switch\"}}]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/#person\",\"name\":\"sladmin\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976#personImage\",\"url\":\"https:\\\/\\\/SUMMALAI.COM\\\/wp-content\\\/uploads\\\/2020\\\/05\\\/Summa_Logo-150x150.png\",\"width\":96,\"height\":96,\"caption\":\"sladmin\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?author=2#author\",\"url\":\"https:\\\/\\\/SUMMALAI.COM\\\/?author=2\",\"name\":\"Summa Lai\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976#authorImage\",\"url\":\"https:\\\/\\\/SUMMALAI.COM\\\/wp-content\\\/uploads\\\/2020\\\/05\\\/Summa_Logo-150x150.png\",\"width\":96,\"height\":96,\"caption\":\"Summa Lai\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976#webpage\",\"url\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976\",\"name\":\"How to Configure Allowed VLANs on Cisco Trunk | Summa Lai\",\"description\":\"By default, all VLANs are allowed across the trunk link. We can verify that using the show interfaces trunk command: You can prevent traffic from certain VLANs from traversing a trunked link using the following interface mode command: switchport trunk allowed vlan {add | all | except | remove} vlan-list For example, to prevent traffic from VLAN\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?p=2976#breadcrumblist\"},\"author\":{\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?author=2#author\"},\"creator\":{\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/?author=2#author\"},\"datePublished\":\"2021-01-27T16:12:11-08:00\",\"dateModified\":\"2021-01-27T16:12:13-08:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/#website\",\"url\":\"https:\\\/\\\/SUMMALAI.COM\\\/\",\"name\":\"Summa Lai\",\"description\":\"Never Stop Learning, Building a Little Wiki...\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/SUMMALAI.COM\\\/#person\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"How to Configure Allowed VLANs on Cisco Trunk | Summa Lai","description":"By default, all VLANs are allowed across the trunk link. 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