Unannounced maintenance by Cogent affecting ZRH

타임라인

1. 해결됨2025. 4. 27. 오전 1:13 UTC

   Full redundancy restored at 01:13 UTC. Duration: 39 minutes. No connectivity was lost; we have asked Cogent for the notification that should have preceded this work.

2. 모니터링 중2025. 4. 27. 오전 1:07 UTC

   Cogent reports the work complete. We have re-enabled the session and are watching it.

3. 원인 확인2025. 4. 27. 오전 12:51 UTC

   Cogent confirms unannounced maintenance on the aggregation router that terminates our circuit. The flapping will continue until their work finishes; we have shut the session so that traffic stays stable on the other paths.

4. 조사 중2025. 4. 27. 오전 12:38 UTC

   The Cogent uplink in ZRH has been flapping since 00:34 UTC. Traffic is on Init7 and SwissIX. We have opened a ticket with Cogent.