At 00:27:10 all traffic on both BT link stopped, and BGP timed out. This is after some sort of blip affectiong lots of lines at around 00:00. This resulted in all sessions dropping shortly after. The connection resumed at 00:29:08.
This looks almost exactly the same as a few nights ago, which turned out to be a planned work that had been sneaked in. This was the same second on both lines this time, so not exactly the same.
Lines reconnected over several minutes. BE lines were unaffected.
The rate at which lines are reconnecting seems unusually slow.
Looks like a lot of people got a "BT default accept" during the outage which means they spend a while on an unconnected link. That then has to time out before they connect again. This could explain the slow connections.
A few people ended up on the wrong LNS briefly as well.
Connections are stable now, but low on numbers. If you are off line, try restarting your connection.
I'll leave this MSO open until we have more details in the morning.
Lines came back in batches after the incident, and there were a number of BRAS specific issues during the night as well.
We'll post any more information we get from BT when we get it.