Incident Library

Component

Interior routing (IGP)

내부 라우팅 · igp-routing

3 cases · 2021 to 2023

Root cause Configuration change3
Contributing factor Excessive blast radius3No configuration tests2Unverified assumption1Change during peak hours1Harmful manual action1Ineffective rollback1Missed in review1
Symptom Network unreachable3Service outage2High latency1Intermittent connection failures1Intermittent timeouts1Packet loss1
Organisation KT1Microsoft Azure1OVHcloud1

Cases, by severity

  1. IL-0225 An IGP purge command made every Microsoft WAN router recompute routes, causing global latency, timeouts and packet lossMicrosoft Azure · 2023

    Root cause Configuration change

  2. IL-0539 KT's internet service failed nationwide for about 89 minutes as wrong routes spread from one router in BusanKT · 2021

    Root cause Configuration change

  3. IL-0228 IPv4 routing across OVHcloud's global network broke after a router change put the full internet routing table into OSPFOVHcloud · 2021

    Root cause Configuration change

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