The issue has been resolved.

We’ve confirmed that the incident was caused by routine maintenance on our top-of-rack (ToR) switch. During the upgrade, some traffic was intermittently routed through the affected ToR, leading to occasional packet loss in our infrastructure.

The connectivity issues we mainly related to a top-of-the-rack (TOR) misbehaving. The situation should have been recovered for most, if not all, customers.

We are monitoring the situation.

A top-of-the-rack (TOR) is being reconfigured, and it should improve the situation.

We are investigating the traffic flowing from our edge routers to our internal infrastructure.

IPv6 connectivity is fine, it seems that IPv4 traffic is affected.

We still haven’t found the root cause, the investigation is still ongoing.

From a monitoring perspective, we are not seeing any packet loss.
We are going to drain our transit provider in ZRH1 (Cogent).

We are escalating the severity of the incident since multiple customers seem to be impacted. We are not seeing an emerging pattern.

We are actively investigating the situation.

We are currently suffering from occasional packet loss. Investigations are under way.