{"id":4265,"date":"2026-05-13T02:32:30","date_gmt":"2026-05-13T02:32:30","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/vxlan-network-identifier-vni-segmentation-scalability\/"},"modified":"2026-06-10T02:07:37","modified_gmt":"2026-06-10T02:07:37","slug":"vxlan-network-identifier-vni-segmentation-scalability","status":"publish","type":"post","link":"https:\/\/lp.szlogic.cn\/ru\/glossary\/vxlan-network-identifier-vni-segmentation-scalability","title":{"rendered":"Understanding VXLAN Network Identifier (VNI): A Comprehensive Guide for Modern Networks"},"content":{"rendered":"\n<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bff280373902437eaf8a5b28cf3c4809.webp\" alt=\"VXLAN Network Identifier (VNI)\" class=\"wp-image-4263\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bff280373902437eaf8a5b28cf3c4809.webp 1200w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bff280373902437eaf8a5b28cf3c4809-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bff280373902437eaf8a5b28cf3c4809-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bff280373902437eaf8a5b28cf3c4809-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bff280373902437eaf8a5b28cf3c4809-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">In today\u2019s rapidly evolving digital landscape, network scalability and flexibility are paramount. As organizations embrace <strong>cloud computing<\/strong>, <strong>IoT<\/strong>, and hybrid infrastructures, traditional networking approaches like <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/vlan-network-segmentation-security-management-basics\"><strong>VLANs<\/strong><\/a> often fall short. Enter <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/virtual-extensible-lan-scalable-secure-network-virtualization\"><strong>VXLAN (Virtual Extensible LAN)<\/strong><\/a>, a revolutionary technology that extends Layer 2 networks over Layer 3 infrastructures. At the heart of VXLAN lies the <strong>VXLAN Network Identifier (VNI)<\/strong>, a critical component enabling seamless network segmentation and multi-tenancy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this blog post, we\u2019ll dive deep into VNI\u2014what it is, how it works, and why it\u2019s essential for modern data centers. We\u2019ll also explore its synergy with hardware components like <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\"><strong>optical modules<\/strong><\/a> and introduce how <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.link-pp.com\/\"><strong>LINK-PP<\/strong><\/a>\u2019s solutions can optimize your network performance. Let\u2019s get started!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x1f3af; Key Takeaways<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>A <strong>VXLAN Network Identifier (VNI)<\/strong> is a 24-bit number. It helps keep virtual networks apart. Each network has its own VNI.<\/p><\/li><li><p>VXLAN can have over 16 million VNIs. This lets you make many networks. You will not run out of IDs.<\/p><\/li><li><p>VNIs help sort network traffic. They stop mix-ups. Devices use the VNI to know where to send data.<\/p><\/li><li><p>VXLAN works better than VLAN for big networks. VLANs can only have about 4,000 networks. VXLAN can have millions.<\/p><\/li><li><p>Always give each segment its own VNI. Keep a list of all VNIs. This helps you manage your network more easily.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x1f3af; What is VXLAN Network Identifier (VNI)?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>VXLAN Network Identifier (VNI)<\/strong> is a 24-bit field used in <strong>VXLAN<\/strong> headers to uniquely identify isolated Layer 2 segments, often referred to as &#8220;overlay networks.&#8221; Think of it as a virtual LAN ID on steroids\u2014while traditional VLANs use a 12-bit identifier (supporting up to 4,094 segments), VNI expands this to over 16 million segments! This scalability is crucial for large-scale cloud environments, data centers, and multi-tenant architectures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Key features of VNI include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>Isolation<\/strong>: Each VNI corresponds to a separate broadcast domain, ensuring secure segmentation.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Flexibility<\/strong>: VNIs can span physical boundaries, enabling workloads to migrate across subnets without reconfiguration.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Interoperability<\/strong>: VXLAN seamlessly integrates with existing IP networks, using UDP encapsulation for traffic forwarding.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For instance, in a multi-tenant cloud, each customer can be assigned a unique VNI, ensuring their traffic remains isolated from others\u2014a fundamental aspect of <strong>data center network virtualization<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x1f3af; How Does VNI Work? The Technical Breakdown<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/virtual-extensible-lan-scalable-secure-network-virtualization\"><strong>VXLAN<\/strong><\/a> operates by encapsulating Ethernet frames within IP\/UDP packets. The VNI plays a pivotal role in this process:<\/p>\n\n\n\n<ol class=\"wp-block-list\" >\n<li><p style=\"margin: 0px;\"><strong>Encapsulation<\/strong>: When a frame enters a VXLAN tunnel, the VNI is added to the header alongside source\/destination IP addresses.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Forwarding<\/strong>: Network devices (e.g., switches\/routers) use the VNI to map traffic to the correct overlay network.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Decapsulation<\/strong>: At the destination, the VNI is stripped, and the original frame is delivered.<\/p><\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"643\" src=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/047057cf9ebc45b98a15b5860a59e28b.webp\" alt=\"VXLAN Network Identifier (VNI)\" class=\"wp-image-4264\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/047057cf9ebc45b98a15b5860a59e28b.webp 1200w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/047057cf9ebc45b98a15b5860a59e28b-300x161.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/047057cf9ebc45b98a15b5860a59e28b-1024x549.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/047057cf9ebc45b98a15b5860a59e28b-768x412.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/047057cf9ebc45b98a15b5860a59e28b-18x10.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s a simplified workflow:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><mark data-color=\"var(--qc-color21)\" style=\"background-color: var(--qc-color21); color: inherit;\">Original Frame \u2192 VXLAN Encapsulation (VNI + IP\/UDP) \u2192 Transport Over Layer 3 \u2192 Decapsulation \u2192 Delivered Frame<\/mark><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This mechanism allows <strong>VXLAN VNI<\/strong> to support:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>Network Overlays<\/strong>: Creating logical networks independent of physical topology.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Dynamic Scaling<\/strong>: Adding new segments without hardware changes.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Load Balancing<\/strong>: Distributing traffic efficiently across paths.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A common application is in <strong>spine-leaf architectures<\/strong>, where VNIs facilitate east-west traffic flow between servers, enhancing performance and reducing latency.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x1f3af; VNI vs. Traditional VLAN: A Comparative Analysis<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">While VLANs have been the go-to for network segmentation, <strong>VXLAN<\/strong> <strong>with VNI<\/strong> offers superior scalability and flexibility. Let\u2019s compare them in a table:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p><strong>Feature<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>Traditional VLAN<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>VXLAN with VNI<\/strong><\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Identifier Size<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>12-bit (4,094 segments)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>24-bit (~16 million segments)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Scalability<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Limited for large deployments<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ideal for cloud\/data centers<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Encapsulation<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>IEEE 802.1Q tagging<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>IP\/UDP-based encapsulation<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Network Span<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Restricted to Layer 2 domains<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Spans Layer 3 boundaries<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Multi-tenancy Support<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Basic<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Advanced with isolation<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">As shown, VNI\u2019s 24-bit space eliminates VLAN limitations, making it a cornerstone for <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/software-defined-networking-centralized-flexible-network-management\"><strong>software-defined networking (SDN)<\/strong><\/a> and <strong>network automation<\/strong>. For businesses adopting digital transformation, this translates to agile, future-proof infrastructures.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x1f3af; Benefits of Using VNI in Your Network<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Integrating VNI into your network strategy unlocks numerous advantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>Enhanced Scalability<\/strong>: Support millions of segments, perfect for hyperscale environments.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Improved Security<\/strong>: Isolate sensitive workloads using VNI-based policies.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Simplified Management<\/strong>: Automate network provisioning with tools like <strong>LINK-PP<\/strong>\u2019s orchestration platforms.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Cost Efficiency<\/strong>: Reduce hardware dependencies by leveraging existing IP networks.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For example, a global enterprise using <strong>VXLAN VNI best practices<\/strong> can seamlessly connect geographically dispersed data centers while maintaining compliance and performance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x1f3af; The Role of Optical Modules in VXLAN Networks<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\"><strong>Optical transceivers<\/strong><\/a> are unsung heroes in high-performance networks, translating electrical signals into light for fast, reliable data transmission. In VXLAN environments, they ensure low-latency, high-bandwidth connectivity\u2014critical for handling encapsulated traffic.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Key considerations when selecting optical modules for <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/virtual-extensible-lan-scalable-secure-network-virtualization\"><strong>VXLAN<\/strong><\/a>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>Speed<\/strong>: 25G, 100G, or 400G modules to match VXLAN\u2019s throughput demands.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Compatibility<\/strong>: Must support protocols like Ethernet and IP.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Reliability<\/strong>: Low <a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/understanding-what-is-bit-error-rate\"><strong>bit error rates (BER)<\/strong><\/a> to prevent packet loss.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>LINK-PP<\/strong> offers industry-leading optical modules, such as the <strong>LINK-PP <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\"><strong>100G QSFP28 Transceivers<\/strong><\/a>, designed for data-intensive applications. This module provides:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>High Density<\/strong>: Fits seamlessly into spine-leaf switches.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Energy Efficiency<\/strong>: Reduces power consumption in large-scale deployments.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Interoperability<\/strong>: Works with major vendors like Cisco and Arista.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">By pairing VXLAN with <strong>LINK-PP 100G QSFP28<\/strong> <strong>modules<\/strong>, organizations can achieve robust, scalable networks capable of handling modern workloads like AI and big data analytics.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x1f3af; Real-World Applications of VNI<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">VNI is widely adopted in scenarios such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>Cloud Data Centers<\/strong>: Enabling multi-tenancy in AWS, Azure, or private clouds.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Disaster Recovery<\/strong>: Extending networks across sites without re-IPing.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Edge Computing<\/strong>: Securing IoT devices with isolated segments.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For instance, a financial institution might use VNIs to separate trading, customer, and admin traffic, ensuring compliance with regulations like GDPR.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x1f3af; Conclusion and Next Steps<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>VXLAN Network Identifier (VNI)<\/strong> is more than just a technical spec\u2014it\u2019s a gateway to agile, scalable networking. By understanding its role in encapsulation, segmentation, and multi-tenancy, you can future-proof your infrastructure against growing demands.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ready to optimize your network? Explore <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.link-pp.com\/\"><strong>LINK-PP<\/strong><\/a>\u2019s comprehensive solutions, including the high-performance <strong>LINK-PP <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\"><strong>100G QSFP28<\/strong> <strong>optical modules<\/strong><\/a>, to enhance your VXLAN deployments. <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/page\/contactus.htm\"><strong>[Contact LINK-PP today]<\/strong><\/a> for a personalized consultation and unlock the full potential of your network!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x1f3af; FAQ<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" >What is the main purpose of a VNI in VXLAN?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">You use a VNI to keep each virtual network separate. The VNI acts like a label. It helps devices know which network a packet belongs to.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >What happens if two networks use the same VNI?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you use the same VNI for two networks, their traffic can mix. This can cause confusion and security risks. Always assign a unique VNI to each network.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >What is the maximum number of VNIs you can use?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">You can use up to 16,777,216 VNIs. This large number lets you create many separate networks in one data center.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >What devices support VXLAN and VNIs?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Most modern switches, routers, and firewalls support VXLAN and VNIs. You should check your device\u2019s documentation to make sure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >What is the difference between a VNI and a VLAN ID?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A VNI uses 24 bits and supports millions of networks. A VLAN ID uses 12 bits and supports about 4,000 networks. VNIs give you more room to grow.<\/p>\n\n\n","protected":false},"excerpt":{"rendered":"<p>A VXLAN Network Identifier (VNI) is a unique 24-bit segment ID enabling scalable network segmentation and isolation in large VXLAN-based environments.<\/p>","protected":false},"author":1,"featured_media":4263,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[27],"tags":[24,26],"class_list":["post-4265","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary","tag-link-pp","tag-optics-transceivers"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/4265","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/comments?post=4265"}],"version-history":[{"count":3,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/4265\/revisions"}],"predecessor-version":[{"id":9473,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/4265\/revisions\/9473"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media\/4263"}],"wp:attachment":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media?parent=4265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/categories?post=4265"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/tags?post=4265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}