Posted 6AM: We're seeing many CityFibre connections dropping their connections since 1AM. they seem to drop a few times an hour.
Cityfibre services are now connected. Investigations continue regarding the cause.
We do apologise for the problem overnight with CityFibre. We are aware what caused the problem and are investigating it further, and will post again here later today.
These should never be sent by CityFibre towards us and so our switches are configured to disable the port if they are ever received, as if they are received then it indicates a bigger problem with the connection.
The second problem was the lack of alerts from our monitoring systems regarding this and so staff were not aware until around 6AM.
We have a ticket open with CityFibre regarding the initial problem regarding the BPDUs. We are also going to be improving our alerting so that staff are made aware of problems like this sooner.