{"id":12290,"date":"2024-05-15T13:00:42","date_gmt":"2024-05-15T06:00:42","guid":{"rendered":"https:\/\/dngcorp.vn\/huong-dan-cau-hinh-dinh-tuyen-inter-vlan-switch-layer-3\/"},"modified":"2025-05-19T17:00:02","modified_gmt":"2025-05-19T10:00:02","slug":"detailed-instructions-for-configuring-inter-vlan-switch-layer-3-routing","status":"publish","type":"post","link":"https:\/\/dngcorp.vn\/en\/detailed-instructions-for-configuring-inter-vlan-switch-layer-3-routing\/","title":{"rendered":"Detailed instructions for configuring Inter VLAN Switch Layer 3 routing"},"content":{"rendered":"<div style=\"text-align: justify;\">Inter VLAN routing configuration is a necessary operation for devices in VLAN to communicate and transmit data to each other. In the article below, DNG Corp will guide you through the steps to configure Inter-VLAN Switch Layer 3 routing easily and quickly.<\/div>\n<h2 style=\"text-align: justify;\"><strong>What is Inter VLAN Switch Layer 3?<\/strong><\/h2>\n<div style=\"text-align: justify;\">Before going into the routing configuration instructions, DNG Corp will summarize the information so that readers can better understand what Inter VLAN Switch Layer 3 is?<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">Normally, routers (also known as routers) are used to divide broadcast domains and switches (switches) at layer 2. Although operating in a single broadcast domain, switches can also divide broadcast domains using VLANs (Virtual LANs).<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">VLANs are understood as logical network groups of devices in a broadcast domain (which may or may not be in the same broadcast domain). Furthermore, all switch ports are in VLAN 1 by default. Since a single broadcast domain is divided into multiple broadcast domains, routers or Layer 3 Switches are used to perform the task of communication between different VLANs. This process of communication between different VLANs is called Inter VLAN Routing.<\/div>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6060 size-full\" title=\"\u0110\u1ecbnh tuy\u1ebfn Inter VLAN Switch Layer 3 l\u00e0 g\u00ec?\" src=\"https:\/\/dngcorp.vn\/wp-content\/uploads\/2024\/05\/inter-vlan-switch-layer-3-1.jpg\" alt=\"\u0110\u1ecbnh tuy\u1ebfn Inter VLAN Switch Layer 3 l\u00e0 g\u00ec?\" width=\"800\" height=\"500\" \/><\/p>\n<p style=\"text-align: center;\"><em>What is Inter VLAN Switch Layer 3 Routing?<\/em><\/p>\n<div style=\"text-align: justify;\">Suppose, we have created 2 logical device groups (VLANs) named \u201cSales\u201d and \u201cFinance\u201d. In case a device of the \u201cSales\u201d department wants to communicate with a device in the \u201cFinance\u201d department, we are required to route Inter VLAN. This routing will be done by a router or Layer 3 Switch. Thus, it can be understood that Inter VLAN Switch Layer 3 is the routing of inter VLANs using a Layer 3 Switch device.<\/div>\n<h3 style=\"text-align: justify;\"><strong>Advantages of VLAN routing using Layer 3 Switch<\/strong><\/h3>\n<div style=\"text-align: justify;\">VLAN routing using Layer 3 Switch plays an important role in the process of connecting network systems in enterprises due to the following outstanding advantages:<\/div>\n<ul>\n<li style=\"text-align: justify;\">Increased routing speed: Inter VLAN routing using Layer 3 Switch is faster than other routing methods. Because Layer 3 Switch can perform the routing process quickly without any intervention from other external routers.<\/li>\n<li style=\"text-align: justify;\">Cost-effective: Using Layer 3 Switch for Inter VLAN routing saves costs instead of using a separate router. This method eliminates the need for an external router and its associated costs.<\/li>\n<li style=\"text-align: justify;\">Provides scalability: Inter VLAN layer 3 switches are scalable, as additional VLANs can be easily added without requiring major changes to the network topology.<\/li>\n<li style=\"text-align: justify;\">Ensures security: This inter VLAN routing method provides better security. This is because users are allowed to create access control lists (ACLs) to restrict traffic between VLANs.<\/li>\n<\/ul>\n<h3 style=\"text-align: justify;\"><strong>Disadvantages of using<\/strong><\/h3>\n<div style=\"text-align: justify;\">Although the method of configuring Inter VLAN routing using Layer 3 Switch has many outstanding advantages, it also has disadvantages that need to be overcome as follows:<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">Complicated implementation: Configuring and managing Inter VLAN routing using Layer 3 Switch will be complicated in large network systems with many VLANs.<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">Limited functionality: Compared to using a dedicated router, this method will have more limitations, typically the routing options available to the network administrator.<\/div>\n<div style=\"text-align: justify;\">Single point of failure: If the Layer 3 Switch fails to route, all traffic between VLANs will also be interrupted. This will cause significant network downtime.<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">Increased bandwidth usage: Inter VLAN Switch Layer 3 can lead to increased bandwidth usage, as all traffic between VLANs will have to go through the Layer 3 Switch. If not managed properly, it will cause network congestion.<\/div>\n<p><strong>=&gt; See more: <a href=\"https:\/\/dngcorp.vn\/en\/detailed-instructions-on-how-to-configure-aruba-l3-mobility-iap\/\">Detailed instructions on how to configure L3 Mobility Aruba IAP<\/a><\/strong><\/p>\n<h2 style=\"text-align: justify;\"><strong>Techniques in Inter &#8211; VLAN routing<\/strong><\/h2>\n<div style=\"text-align: justify;\">Some techniques in Inter VLAN routing configuration:<\/div>\n<h3 style=\"text-align: justify;\"><strong>Legacy Inter &#8211; VLAN routing<\/strong><\/h3>\n<div style=\"text-align: justify;\">With this technique, the SVI will be created with the corresponding VLAN, acting as a default gateway for that VLAN. This is like creating a sub-interface of the router in the router on a stick process.<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">If the data packet is sent to different VLANs, it means that Inter VLAN routing is performed on the Layer 3 Switch. At this time, the data packet will be transferred to the L3 Switch and then transferred to the destination, similar to the router on a stick process.<\/div>\n<figure id=\"attachment_6062\" aria-describedby=\"caption-attachment-6062\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-6062 size-full\" title=\"K\u1ef9 thu\u1eadt Legacy Inter-VLAN Routing\u00a0\" src=\"https:\/\/dngcorp.vn\/wp-content\/uploads\/2024\/05\/inter-vlan-switch-layer-3-2.jpg\" alt=\"K\u1ef9 thu\u1eadt Legacy Inter-VLAN Routing\u00a0\" width=\"800\" height=\"500\" \/><figcaption id=\"caption-attachment-6062\" class=\"wp-caption-text\"><em>Legacy Inter-VLAN Routing Technique<\/em><\/figcaption><\/figure>\n<h3 style=\"text-align: justify;\"><strong>Router-on-a-stick<\/strong><\/h3>\n<div style=\"text-align: justify;\">Router-on-a-stick technique is that the user will use a physical port of the router and then divide it into Interfaces with independent logic (Subinterface). At this time, a physical port is divided into stable ports, each port performs the task of a default port for the corresponding VLANs.<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">This technique is applied to most Switch lines, simple configuration, saving expansion ports.<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">However, when using this method, the traffic of the VLANs must share the trunking connection. If this trunking line is congested, the VLANs will also be affected, increasing the delay. The reason is because the data packets must leave the Switches, enter the router and then return to the Switch, at the same time, the Router uses soft switching.<\/div>\n<h3 style=\"text-align: justify;\"><strong>Switch virtual interfaces (SVIs)<\/strong><\/h3>\n<div style=\"text-align: justify;\">SVI is a logical interface on a multilayer switch that provides layer 3 processing for data packets to all switch ports associated with a VLAN. Only one SVI is created for a VLAN.<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">This technique provides all management and routing services, while SVI on Layer 2 Switches only provides management services such as VLAN creation or Telnet\/SSH services. Layer 3 Switches fully inherit the functions of Layer 2, and have higher speeds. In addition, the built-in intelligent IP routing table allows connecting LAN or VLAN ranges. In the same network system, Layer 3 Switches allow superior processing compared to Layer 2, operating more stably without the help of a router. It can be seen that this is the most optimal method to ensure fast and reliable routing.<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">Not only that, when combining this method with Etherchannel technology, it will increase transmission speed and availability much higher.<\/div>\n<h2><strong>Instructions for deploying Auto-configuration inter-vlan routing<\/strong><\/h2>\n<div>Steps for deploying auto-configuration inter-vlan routing for Layer 3 Switch:<\/div>\n<div><\/div>\n<div><strong>Step 1: Configure ssh for Router<\/strong><\/div>\n<div><\/div>\n<div>R1(config)#ip domain-name bkap.edu.vn<\/div>\n<div><\/div>\n<div>R1(config)#username admin password bkap<\/div>\n<div><\/div>\n<div>R1(config)#username admin privi 15<\/div>\n<div><\/div>\n<div>R1(config)#line vty 0 4<\/div>\n<div><\/div>\n<div>R1(config-line)#transport input ssh<\/div>\n<div><\/div>\n<div>R1(config-line)#login local<\/div>\n<div><\/div>\n<div>R1(config-line)#exit<\/div>\n<div><\/div>\n<div>R1(config)#crypto key generate rsa modulus 1024<\/div>\n<div><\/div>\n<div><strong>Step 2: Configure telnet for layer 3 switch<\/strong><\/div>\n<div><\/div>\n<div>DLS(config)#username admin password bkap<\/div>\n<div><\/div>\n<div>DLS(config)#username admin privi 15<\/div>\n<div><\/div>\n<div>DLS(config)#line vty 0 4<\/div>\n<div><\/div>\n<div>DLS(config-line)#transport input telnet<\/div>\n<div><\/div>\n<div>DLS(config-line)#login local<\/div>\n<div><\/div>\n<div>DLS(config-line)#exit<\/div>\n<div><\/div>\n<div><strong>Step 3: Verify<\/strong><\/div>\n<div><\/div>\n<div>Perform Verify from Admin SSH\/Telnet to R1 and DLS<\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6064 size-full\" title=\"H\u01b0\u1edbng d\u1eabn b\u01b0\u1edbc 3 c\u1ea5u h\u00ecnh \u0111\u1ecbnh tuy\u1ebfn Inter VLAN\" src=\"https:\/\/dngcorp.vn\/wp-content\/uploads\/2024\/05\/inter-vlan-switch-layer-3-3.jpg\" alt=\"H\u01b0\u1edbng d\u1eabn b\u01b0\u1edbc 3 c\u1ea5u h\u00ecnh \u0111\u1ecbnh tuy\u1ebfn Inter VLAN\" width=\"800\" height=\"500\" \/><\/p>\n<p style=\"text-align: center;\"><em>Step 3 guide to configure Inter VLAN routing<\/em><\/p>\n<div><strong>Step 4: Prepare the document containing the commands to be executed for R1<\/strong><\/div>\n<div><\/div>\n<div>int e0\/1<\/div>\n<div><\/div>\n<div>no shutdown<\/div>\n<div><\/div>\n<div>int e0\/1.10<\/div>\n<div><\/div>\n<div>encapsulation dot1Q 10<\/div>\n<div><\/div>\n<div>ip add 192.168.10.1 255.255.255.0<\/div>\n<div><\/div>\n<div>ip route 192.168.20.0 255.255.255.0 192.168.122.118<\/div>\n<div><\/div>\n<div><strong>Step 5: Prepare the document containing the commands to be executed for DLS<\/strong><\/div>\n<div><\/div>\n<div>Config terminal<\/div>\n<div><\/div>\n<div>vlan 20<\/div>\n<div><\/div>\n<div>name DLS<\/div>\n<div><\/div>\n<div>int vlan 20<\/div>\n<div><\/div>\n<div>no shutdown<\/div>\n<div><\/div>\n<div>ip add 192.168.20.1 255.255.255.0<\/div>\n<div><\/div>\n<div>ip routing<\/div>\n<div><\/div>\n<div>ip route 192.168.10.0 255.255.255.0 192.168.122.190 int e0\/1 sw mode access sw access vlan 20 sw port-security sw port-security max 2 sw port-security mac sticky sw port-security violation restrict<\/div>\n<div><strong>Step 6: Write configuration setup script import getpass import telnetlib from netmiko import <\/strong><\/div>\n<div>ConnectHandler Router_R1 = { &#8216;device_type&#8217;: &#8216;cisco_ios&#8217;, &#8216;ip&#8217;: &#8217;19 2.168.122.190&#8242;, &#8216;username&#8217;: &#8216;admin&#8217;, &#8216;password&#8217;: &#8216;123&#8217;, } with open(&#8216;R1&#8217;) as f: lines = f.read().splitlines() net_connect = ConnectHandler(**Router_R1) output = net_connect.send_config_set(lines) print (output) HOST = &#8220;192.168.122.118&#8221; user = input(&#8220;Enter your telnet username: &#8220;) password = getpass.getpass() tn = telnetlib.Telnet(HOST) tn.read_until(b&#8221;Username: &#8220;) tn.write(user.encode(&#8216;ascii&#8217;) + b&#8221;\\n&#8221;) if password: tn.read_until( b&#8221;Password: &#8220;) tn.write(password.encode(&#8216;ascii&#8217;) + b&#8221;\\n&#8221;) with open(&#8216;DLS&#8217;) as f: lines = f.read().splitlines() print(lines) for i in lines:\u00a0 \u00a0 \u00a0tn.write(i.encode(&#8216;ascii&#8217;) + b&#8221;\\n&#8221;)<\/div>\n<div><\/div>\n<div>tn.write(b&#8221;end\\n&#8221;)<\/div>\n<div><\/div>\n<div>tn.write(b&#8221;exit\\n&#8221;)<\/div>\n<div><\/div>\n<div>print(tn.read_all().decode(&#8216;ascii&#8217;))<\/div>\n<div><\/div>\n<div><strong>Step 7: Run the script and check the results<\/strong><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6066 size-full\" title=\"H\u01b0\u1edbng d\u1eabn b\u01b0\u1edbc 7 c\u1ea5u h\u00ecnh \u0111\u1ecbnh tuy\u1ebfn Inter VLAN Switch \" src=\"https:\/\/dngcorp.vn\/wp-content\/uploads\/2024\/05\/inter-vlan-switch-layer-3-4.jpg\" alt=\"H\u01b0\u1edbng d\u1eabn b\u01b0\u1edbc 7 c\u1ea5u h\u00ecnh \u0111\u1ecbnh tuy\u1ebfn Inter VLAN Switch \" width=\"935\" height=\"854\" \/><\/p>\n<p style=\"text-align: center;\"><em>Step 7 guide to configure Inter VLAN Switch Layer 3 routing<\/em><\/p>\n<p>Results received:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6065 size-full\" title=\"K\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c sau khi c\u1ea5u h\u00ecnh \u0111\u1ecbnh tuy\u1ebfn Inter VLAN Switch L3\" src=\"https:\/\/dngcorp.vn\/wp-content\/uploads\/2024\/05\/inter-vlan-switch-layer-3-5.jpg\" alt=\"K\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c sau khi c\u1ea5u h\u00ecnh \u0111\u1ecbnh tuy\u1ebfn Inter VLAN Switch L3\" width=\"935\" height=\"369\" \/><\/p>\n<p style=\"text-align: center;\"><em>Results obtained after configuring Inter VLAN Switch L3 routing<\/em><\/p>\n<div style=\"text-align: justify;\">These are all the steps to configure Inter VLAN Switch Layer 3 routing that DNG Corp informs you.<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">DNG Corp is proud to be a unit with many years of experience operating in the field of providing specialized technology solutions, especially ICT systems, along with owning a team of highly specialized engineers and technicians. We are committed to not only bringing businesses quality products and services from famous prestigious brands such as Soltech with the best priced Layer 3 Switch product line for businesses.<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\">Leave your information at Email: sales@dngcorp.vn or contact Hotline: 0983 959 796\/ 0988 712 159 for free consultation on ICT technology solutions.<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Inter VLAN routing configuration is a necessary operation for devices in VLAN to communicate and transmit data to each other. In the article below, DNG Corp will guide you through the steps to configure Inter-VLAN Switch Layer 3 routing easily and quickly. What is Inter VLAN Switch Layer 3? Before going into the routing configuration&#8230;<\/p>\n","protected":false},"author":2,"featured_media":18831,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[452],"tags":[],"class_list":["post-12290","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-huong-dan-su-dung-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Detailed instructions for configuring Inter VLAN Switch Layer 3 routing<\/title>\n<meta name=\"description\" content=\"Discover how to configure Inter-VLAN Switch Layer 3 routing easily and quickly with detailed instructions from DNG Corp\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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