--- title: OSPF ECMP with Unnumbered IPv4 Interfaces « ipSpace.net blog description: A quick lab experiment verifying that OSPF ECMP works correctly across parallel unnumbered IPv4 interfaces. Using netlab, the author spins up a two-node... canonical: https://daily.dev/posts/ospf-ecmp-with-unnumbered-ipv4-interfaces-ipspace-net-blog-bs9chw9cj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: OSPF ECMP with Unnumbered IPv4 Interfaces « ipSpace.net blog | daily.dev og:description: A quick lab experiment verifying that OSPF ECMP works correctly across parallel unnumbered IPv4 interfaces. Using netlab, the author spins up a two-node... og:url: https://daily.dev/posts/ospf-ecmp-with-unnumbered-ipv4-interfaces-ipspace-net-blog-bs9chw9cj og:image: https://api.daily.dev/og/posts/Bs9chw9cJ.png og:image:alt: OSPF ECMP with Unnumbered IPv4 Interfaces « 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. # OSPF ECMP with Unnumbered IPv4 Interfaces « ipSpace.net blog **[ipSpace.net Blog](https://daily.dev/sources/ipspace)** · 3 min read · 0 upvotes · 0 comments ## Summary A quick lab experiment verifying that OSPF ECMP works correctly across parallel unnumbered IPv4 interfaces. Using netlab, the author spins up a two-node topology with two parallel unnumbered point-to-point links and confirms that both Arista EOS and Cisco IOS/XE correctly install multiple equal-cost routes. The entire test took about 30 seconds of configuration plus VM boot time. A commenter notes that on IOS-XE the command 'ip unnumbered Loopback0 poll point-to-point' is required to make connectivity work in such setups. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Does OSPF ECMP work over parallel unnumbered IPv4 interfaces on Arista EOS and Cisco IOS/XE? Yes, OSPF ECMP works flawlessly over parallel unnumbered IPv4 interfaces on both Arista EOS and Cisco IOS/XE. Both platforms correctly install multiple equal-cost routes pointing to separate outgoing interfaces for the same destination. On Cisco IOS-XE, the interface must be configured with 'ip unnumbered Loopback0 poll point-to-point' to ensure full connectivity. _Network engineers validating OSPF designs with unnumbered interfaces track findings like these on daily.dev._ ## Similar posts on daily.dev - [The Never-Ending IPv6 Loopback Prefix Saga « ipSpace.net blog](https://daily.dev/posts/the-never-ending-ipv6-loopback-prefix-saga-ipspace-net-blog-4nlhgh10l) · ipSpace.net Blog · 0 upvotes · 0 comments --- Tags: [#networking](https://daily.dev/tags/networking) [View this post on daily.dev](https://daily.dev/posts/ospf-ecmp-with-unnumbered-ipv4-interfaces-ipspace-net-blog-bs9chw9cj) ```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":"OSPF ECMP with Unnumbered IPv4 Interfaces « ipSpace.net blog","url":"https://daily.dev/posts/ospf-ecmp-with-unnumbered-ipv4-interfaces-ipspace-net-blog-bs9chw9cj","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/ospf-ecmp-with-unnumbered-ipv4-interfaces-ipspace-net-blog-bs9chw9cj"},"datePublished":"2026-08-11T08:52:49.864Z","dateModified":"2026-08-11T09:14:53.784Z","description":"A quick lab experiment verifying that OSPF ECMP works correctly across parallel unnumbered IPv4 interfaces. 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Both platforms correctly install multiple equal-cost routes pointing to separate outgoing interfaces for the same destination. On Cisco IOS-XE, the interface must be configured with 'ip unnumbered Loopback0 poll point-to-point' to ensure full connectivity. Network engineers validating OSPF designs with unnumbered interfaces track findings like these on daily.dev."}}]} ```