Packet loss on the Cogent uplink in AMS

タイムライン

1. 解決済み2026/03/28 6:40 UTC

   The Cogent uplink in AMS has been clean for 23 minutes with the session restored. Total duration of the degradation: 1 h 35 min. No machine lost connectivity; some traffic saw higher latency during the detour.

2. 監視中2026/03/28 6:17 UTC

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

3. 原因特定2026/03/28 5:31 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 We have withdrawn our prefixes from that session, and all traffic is leaving through Lumen and NL-ix for now. Loss has cleared; latency to some destinations is 3–6 ms higher while the detour is in place.

4. 調査中2026/03/28 5:08 UTC

   We are investigating packet loss of around 5% towards a subset of destinations from AMS. Alerts fired at 05:05 UTC on the Cogent uplink; the Lumen uplink and the NL-ix peering are clean. Machines remain reachable.