Packet loss on the Cogent uplink in AMS

时间线

1. 已解决2025年8月25日 19:29 UTC

   The Cogent uplink in AMS has been clean for 5 minutes with the session restored. Total duration of the degradation: 26 minutes. No machine lost connectivity; some traffic saw higher latency during the detour.

2. 观察中2025年8月25日 19:24 UTC

   Cogent reports the card replaced. We have re-enabled the session and are watching error counters before calling this resolved.

3. 已确定原因2025年8月25日 19:10 UTC

   Cogent has confirmed a faulty line card on their side of the AMS handover. We have withdrawn our prefixes from that session, and all traffic is leaving through Lumen and AMS-IX for now. Loss has cleared; latency to some destinations is 3–6 ms higher while the detour is in place.

4. 调查中2025年8月25日 19:06 UTC

   We are investigating packet loss of around 9% towards a subset of destinations from AMS. Alerts fired at 19:03 UTC on the Cogent uplink; the Lumen uplink and the AMS-IX peering are clean. Machines remain reachable.