This incident is now resolved and the wavelengths in question have been reintroduced to our network.

Service has remained stable for some time. Initial investigations indicate an issue with 2 wavelengths from Wolverhampton to London, causing a number of protocols to flap, interrupting traffic. We took action to disable those wavelengths which stabilised traffic. We will be reintroducing those wavelengths during a planned window late one evening to be able to monitor traffic as they're reintroduced.

After around 5 minutes of service interruption in total, we are seeing services return to normal. Please raise a ticket if you're experiencing any issues.

We are still seeing services flap, this has been raised to director-level with the upstream provider.

They have confirmed they're currently investigating the root cause of the incident.

The reboot has been completed successfully with only ~3 minutes of downtime. Thank you for your patience.

The reboot has commenced - this may take up to 20 minutes to complete.

We've seen no further drops - this incident has been resolved.

To summerise, a change was done on one of the core backbone links at Stellium, there was an issue with this, and the change was rolled back. The change has since been reimplemented successfully.

This is related to the installation of a new 100Gb wavelength between London and Newcastle.

We'll keep this incident open overnight, and will confirm closure tomorrow morning - however it seems like the issue should not re-occur.

We've spoken to the carrier we use for our circuits back to London and they're currently aware of an issue on their network. However, service resumed after around 10 minutes of disruption. We're currently speaking to their engineers to find out what's happened.