On Thursday 25 January 2018, while expanding the Google network serving the us-central1 region, a configuration change unexpectedly triggered packet loss and reduced network bandwidth for inter-region data transfer and replication traffic to and from the region. The network impact was observable during two windows, between 11:03 and 12:40 PST, and again between 14:27 and 15:27 PST. The principal user-visible impact was a degradation in the performance of some Google Cloud services that require cross data center traffic. There was no impact to network traffic between the us-central1 region and the internet, or to traffic between Compute Engine VM instances.

We sincerely apologize for the impact of this incident on your application or service. We have performed a detailed analysis of root cause and taken careful steps to ensure that this type of incident will not recur.

The issue with Google Cloud Networking has been resolved for all affected users as of 2018-01-25 13:15 US/Pacific. We will conduct an internal investigation of this issue and make appropriate improvements to our systems to help prevent or minimize future recurrence. We will provide a more detailed analysis of this incident once we have completed our internal investigation.

The issue with Google Cloud Networking should be resolved for the majority of users and we expect a full resolution in the near future. We will provide another status update by 2018-01-25 14:00 US/Pacific with current details.

We are investigating an issue with Google Cloud Networking. We will provide more information by 13:00 US/Pacific.