BGP session instability with Cogent in ZRH
Network — transit & peering — ZRH
Timeline
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Resolved
Stable since 19:45 UTC. Outbound traffic is back on its normal paths. Duration: 37 minutes. Impact was limited to brief latency spikes on some routes; no session to a machine was reset.
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Monitoring
The session has been stable for 9 minutes. Traffic remains on Init7 while we watch.
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Identified
The resets coincide with a route-refresh storm on the Cogent side. We have applied dampening on our end and shifted outbound traffic to Init7 while Cogent investigates.
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Investigating
The BGP session with Cogent in ZRH has reset 7 times since 19:08 UTC. Each reset causes a few seconds of reconvergence for traffic that prefers that path. We are looking at our side of the session first.
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Related pages
- Service statusLive status of every gpuserver.io component and data centre, probed every 60 seconds from five cities, with 90-day uptime and the incident log since 2022.
- Incident historyEvery incident and maintenance window on gpuserver.io since monitoring began in September 2022, month by month, with its timeline and post-incident review.
- Service level agreementThe 99.9% commitment: what counts as downtime, how it is measured from outside, five minutes of term back per minute lost, and the exclusions in full.
- NetworkUnmetered ports up to 25 Gbit/s, two carriers and an IX per site, always-on DDoS filtering, routed IPv6 — and the four things we do not offer, stated up front.