We have a fault open with BT regarding the Harvington Exchange. We are seeing packet loss, typically between 8am and 2am, and getting up to 20% at peak times in the evening.
BT have already tried resetting the line card, but this has not worked.
BT are still investigating.
This has been escalated within BT. Other ISPs are seeing a similar issue. Currently, BT's 'Technical Services' are investigating the problem.
BT have worked at the exchange early hours of this morning to try and resolve the issue. We will have to wait until around 3pm today to see if the heavy packet loss has been fixed.
The details from BT are as follows: "The technical team have worked all night on this issue. An engineer was sent to the exchange in the early hours of this morning and has reseated several IML cables in the network to see if this alleviates the issue. Ping testing has been carried out extensively since the reseats and where there was small packet loss seen prior to the reseat these are now proving to be totally clear."
Looks like the amount of loss is increasing. BT are still investigating.
From BT: Will get this info back over now and ensure tech services are involved to get to the bottom of this issue as agree this is really frustrating that we cannot find the route cause here
Chasing BT for an update
The controller card was reset rather than changed at 02:56am this morning and TSO are waiting on confirmation now if this has made a difference.
BT's efforts over the weekend has not fixed the problem. We will be chasing BT again.
BT are looking to see if it is possible to move our affected lines on to a different SVLAN. (in short, a different link out of the Exchange). We'll update this post when we get an update from BT.
BT are planning to move the lines to a different SVLAN, we're not sure when this will be done yet though. We'll update again when we have further information.
BT have moved the lines to a different SVLAN, and the packet loss problem has gone away.