|
Copyright © 2010
8086 Limited
All rights reserved. |
|
ISP Status
AAISP
| 2010/May/11 22:50 UTC |
|---|
| [info] Congestion issues. | We are still tracking a number of congestion issues within BT<a href="http://clueless.aaisp.net.uk/congestion.cgi"> http://clueless.aaisp.net.uk/congestion.cgi</a> BT are still working on issues, and have cleared a lot of them. We hope some of these latest issues will clear on Friday.
These are general BT congestion issues affecting other ISPs as well.
However we are also tracking a more specific congestion issue on 20CN links in the evenings and this evening seems worse than usual. We are moving lines from 20CN to 21CN and have been for a couple of months. As such 20CN traffic levels have been stable and we expected them to go down. We think this may have been causing people to see a few percent lower rates in evenings on 20CN. However reports suggest at times it is much worse and particularly today. Because we are moving lots of lines over we have been holding the same commit levels to BT, until now.
Unfortunately it appears usage is increasing, and it will take a few days to get BT to adjust traffic levels to us to improve this. We think that some of the major BT congestion issues (that have been affecting all other ISPs as well) were masking the real demand and fixing these is meaning we have to increase levels, and this has rather caught us by surprise on 20CN.
As you know we aim not to be the bottleneck, and as part of regular reviews we have increased bandwidth several times on 21CN over the last month to ensure usage levels (highest during the day) are not getting too close to limits so we are not the bottleneck. This is the first time we have had to adjust 20CN for months.
There is no issue during the working day on either 20CN or 21CN, and no issue in evenings on 21CN. The possible issue we are addressing is specifically 20CN in the evenings.
If the change does not help enough we will make further changes. These change do take a couple of days to complete and BT do limit the rate we can make changes (yes, that is turning down business and extra money for them, but that is how BT do business).
In the longer term we expect more migrations to 21CN April and May and this should allow us to start reducing 20CN capacity, but only when we are sure it is not going to cause congestion. We are concerned that evening usage on 20CN is becoming the peak time though, so we may consider adjusting the GB/units for evening 20CN after April if this does not change. Obviously if we have to do this we'll be giving plenty of notice. We expect we can increase GB/unit on 21CN at the same time. It is rather ironic that getting BT to fix their network is increasing our costs :-)
We continue our target of not being the bottleneck.
Thank you for your patience.
Update: More than one report suggests other ISPs are also slower than usual this evening, which suggests that this could be the result of various patches/updates causing a lot more download generally resulting in more congestion in the internet and in BT as well and not just us. This is encouraging, but we are still increasing our commit to BT as we are need enough headroom for such things (like we have on 21CN).
Update: <span style="font-weight: bold;">Additional capacity to BT has already been ordered and is expected in a couple of days.</span> More will be ordered next week if needed.<div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/12990991-7442981264167443824?l=aaisp.blogspot.com' alt='' /></div> |
|
|
