--- title: BGP handling bug causes widespread internet routing... description: A BGP handling bug caused significant internet routing instability on May 20th, 2025, due to unexpected behaviors in JunOS and Arista EOS implementations. A... canonical: https://daily.dev/posts/bgp-handling-bug-causes-widespread-internet-routing-instability-b4gng7jas twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: BGP handling bug causes widespread internet routing instability | daily.dev og:description: A BGP handling bug caused significant internet routing instability on May 20th, 2025, due to unexpected behaviors in JunOS and Arista EOS implementations. A... og:url: https://daily.dev/posts/bgp-handling-bug-causes-widespread-internet-routing-instability-b4gng7jas og:image: https://api.daily.dev/og/posts/b4gNg7JAs.png og:image:alt: BGP handling bug causes widespread internet routing instability 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. # BGP handling bug causes widespread internet routing instability **[Benjojo's Blog](https://daily.dev/sources/benjojo)** · 5 min read · 0 upvotes · 0 comments ## Summary A BGP handling bug caused significant internet routing instability on May 20th, 2025, due to unexpected behaviors in JunOS and Arista EOS implementations. A corrupt BGP Prefix-SID Attribute led to widespread shutdowns of internet-facing BGP sessions, affecting connectivity for numerous networks. The incident highlighted flaws in error handling and has implications for the robustness of internet infrastructure. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#bgp](https://daily.dev/tags/bgp), [#networking](https://daily.dev/tags/networking) [View this post on daily.dev](https://daily.dev/posts/bgp-handling-bug-causes-widespread-internet-routing-instability-b4gng7jas) ```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":"BGP handling bug causes widespread internet routing instability","url":"https://daily.dev/posts/bgp-handling-bug-causes-widespread-internet-routing-instability-b4gng7jas","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/bgp-handling-bug-causes-widespread-internet-routing-instability-b4gng7jas"},"datePublished":"2025-05-27T11:03:09.732Z","dateModified":"2026-03-15T05:18:13.477Z","description":"A BGP handling bug caused significant internet routing instability on May 20th, 2025, due to unexpected behaviors in JunOS and Arista EOS implementations. A...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/fcacaa4ea87f8574ee86cc6b5a21f45a?_a=AQAEuj9","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/fcacaa4ea87f8574ee86cc6b5a21f45a?_a=AQAEuj9","isAccessibleForFree":true,"articleSection":"Benjojo's 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":"Benjojo's Blog","logo":"https://media.daily.dev/image/upload/s--mk-v6qFh--/f_auto/v1736753407/logos/benjojo","url":"https://daily.dev/sources/benjojo"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/bgp-handling-bug-causes-widespread-internet-routing-instability-b4gng7jas","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"bgp,networking","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Benjojo's Blog","item":"https://daily.dev/sources/benjojo"},{"@type":"ListItem","position":3,"name":"BGP handling bug causes widespread internet routing instability"}]} ```