--- title: Anycast Fundamentals « ipSpace.net blog | daily.dev description: A deep-dive into anycast fundamentals, clarifying the definition as a network addressing methodology where a single IP address is shared across multiple... canonical: https://daily.dev/posts/anycast-fundamentals-ipspace-net-blog-7rn08bvir twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Anycast Fundamentals « ipSpace.net blog | daily.dev og:description: A deep-dive into anycast fundamentals, clarifying the definition as a network addressing methodology where a single IP address is shared across multiple... og:url: https://daily.dev/posts/anycast-fundamentals-ipspace-net-blog-7rn08bvir og:image: https://api.daily.dev/og/posts/7Rn08Bvir.png og:image:alt: Anycast Fundamentals « ipSpace.net blog og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Anycast Fundamentals « ipSpace.net blog **[ipSpace.net Blog](https://daily.dev/sources/ipspace)** · 5 min read · 0 upvotes · 0 comments ## Summary A deep-dive into anycast fundamentals, clarifying the definition as a network addressing methodology where a single IP address is shared across multiple locations, with routers directing packets to the nearest instance. The post argues that anycast is fundamentally a naming/addressing concept, not tied to any specific transport technology, and therefore works fine with MPLS/LDP. A guest commentary challenges the claim that MPLS is VC-based, arguing it behaves more like packet-switching with loose VC characteristics. The discussion extends to Segment Routing (SR), with skepticism about its advantages over LDP and concerns about SRGB complexity and scalability of centralized SR-TE at large scale. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Does anycast work with MPLS and LDP or does it require Segment Routing? Anycast works fine with MPLS and LDP. Anycast is fundamentally a naming/addressing concept — a single IP prefix announced from multiple locations — and any transport technology that allows the same prefix to be announced from several locations supports it. Limitations are strictly implementational, not technological. LDP assigns labels per prefix and MPLS adjusts LSPs based on underlying routing topology, so there is no fundamental barrier. _Network engineers evaluating SR vs LDP for anycast deployments track these architecture debates on daily.dev._ ### What are the scalability concerns with Segment Routing traffic engineering using a central controller? Centralized SR-TE controllers face the same scaling problems as any centralized routing approach. As network scale grows, the volume of TE state — such as per-lambda information in photonic networks — becomes too large for a central controller to handle efficiently. Introducing global constructs like SRGB also creates tight binding and complexity, especially at large scale, and SRGB can conflict with underlying label resource constraints. _Engineers deciding between distributed and centralized TE approaches find the ongoing SR vs LDP debate covered on daily.dev._ --- Tags: [#bgp](https://daily.dev/tags/bgp) [View this post on daily.dev](https://daily.dev/posts/anycast-fundamentals-ipspace-net-blog-7rn08bvir) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Anycast Fundamentals « ipSpace.net blog","url":"https://daily.dev/posts/anycast-fundamentals-ipspace-net-blog-7rn08bvir","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/anycast-fundamentals-ipspace-net-blog-7rn08bvir"},"datePublished":"2026-08-11T08:52:18.493Z","dateModified":"2026-08-11T09:02:04.345Z","description":"A deep-dive into anycast fundamentals, clarifying the definition as a network addressing methodology where a single IP address is shared across multiple...","image":"https://media.daily.dev/image/upload/s--1KxV4ohY--/f_auto/v1722860400/public/Placeholder%2007","thumbnailUrl":"https://media.daily.dev/image/upload/s--1KxV4ohY--/f_auto/v1722860400/public/Placeholder%2007","isAccessibleForFree":true,"articleSection":"ipSpace.net Blog","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"ipSpace.net Blog","logo":"https://media.daily.dev/image/upload/s--xS7E82MT--/f_auto,q_auto/v1786438303/logos/ipspace?_a=BAMAMicg0","url":"https://daily.dev/sources/ipspace"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/anycast-fundamentals-ipspace-net-blog-7rn08bvir","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"bgp","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"ipSpace.net Blog","item":"https://daily.dev/sources/ipspace"},{"@type":"ListItem","position":3,"name":"Anycast Fundamentals « ipSpace.net blog"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/anycast-fundamentals-ipspace-net-blog-7rn08bvir#faq","mainEntity":[{"@type":"Question","name":"Does anycast work with MPLS and LDP or does it require Segment Routing?","acceptedAnswer":{"@type":"Answer","text":"Anycast works fine with MPLS and LDP. Anycast is fundamentally a naming/addressing concept — a single IP prefix announced from multiple locations — and any transport technology that allows the same prefix to be announced from several locations supports it. Limitations are strictly implementational, not technological. LDP assigns labels per prefix and MPLS adjusts LSPs based on underlying routing topology, so there is no fundamental barrier. Network engineers evaluating SR vs LDP for anycast deployments track these architecture debates on daily.dev."}},{"@type":"Question","name":"What are the scalability concerns with Segment Routing traffic engineering using a central controller?","acceptedAnswer":{"@type":"Answer","text":"Centralized SR-TE controllers face the same scaling problems as any centralized routing approach. As network scale grows, the volume of TE state — such as per-lambda information in photonic networks — becomes too large for a central controller to handle efficiently. Introducing global constructs like SRGB also creates tight binding and complexity, especially at large scale, and SRGB can conflict with underlying label resource constraints. Engineers deciding between distributed and centralized TE approaches find the ongoing SR vs LDP debate covered on daily.dev."}}]} ```