---
title: "BGP handling bug causes widespread internet routing instability"
url: https://daily.dev/posts/bgp-handling-bug-causes-widespread-internet-routing-instability-b4gng7jas
source_url: https://blog.benjojo.co.uk/post/bgp-attr-40-junos-arista-session-reset-incident
type: article
source: "Benjojo's Blog"
published: 2025-05-27T11:03:09.732Z
updated: 2026-03-15T05:18:13.477Z
tags: ["bgp", "networking"]
reading_time: 5
upvotes: 0
comments: 0
language: en
---

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# 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: <https://blog.benjojo.co.uk/post/bgp-attr-40-junos-arista-session-reset-incident>

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---

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)