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MAINTENANCE Planned CityFibre
AFFECTING
CityFibre
STARTING
Mar 27, 12:01 AM (7½ days )
DESCRIPTION

CityFibre are carrying out work that will affect CityFibre connections in Maidenhead, Luton, Leicester, Kettering, Gloucester, Coventry, Glasgow, Bournemouth, Milton Keynes, Newcastle Upon Tyne, Northampton, Norwich, Peterborough, Plymouth, Poole, Reading, Rugby, Solihull, Swindon, Wakefield and Wolverhampton.

Customers may experience a momentary loss of service ranging from a couple of seconds up to a maximum of 30 seconds several times during the maintenance window.


MAINTENANCE Assumed Completed BT
AFFECTING
BT
STARTING
Mar 25, 03:00 AM (5¾ days )
DESCRIPTION

We have multiple interlinks to BT that carry our broadband traffic. BT have scheduled planned work on our links in our Harbour Exchange Square datacentre for 27th March between midnight and 6AM.

So as to minimise the impact on our customers, we will move traffic off these links on 25th March at 3AM. This should be seamless, but last time we attempted this BT had a misconfiguration which caused some customers to drop their connection!


MAINTENANCE Assumed Completed TalkTalk
AFFECTING
TalkTalk
STARTING
Mar 20, 03:00 AM (19¼ hours )
DESCRIPTION

We have multiple interlinks to TalkTalk that carry our broadband traffic. TalkTalk have scheduled planned work on our links in our Telehouse datacentre for 21th March between 1AM and 6AM.

So as to minimise the impact on our customers, we will move traffic off these links on 20th March at 3AM. This should be seamless, but there is a risk of some customers having a brief interruption to their service.


MAINTENANCE Open Router Upgrades
AFFECTING
Router Upgrades
STARTED
Mar 12, 03:00 AM (7 days ago)
DESCRIPTION
We will be performing software upgrades on our BGP routers. These will be scheduled for between 3AM and 4:30AM Tuesday-SAturday this week. This is to bring all our routers up to the same level with software that introduces a few minor feature updates. This work is not expected to impact customers.

MINOR Open Hetzner
AFFECTING
Hetzner
STARTED
Feb 13, 07:00 PM (1 month ago)
DESCRIPTION
Hetzner is a German based server hosting provider. We have seen intermittent problems in routing traffic to them in recent days.

MAINTENANCE Assumed Completed Broadband
AFFECTING
Broadband
STARTED
Jan 19, 03:50 PM (2 months ago)
DESCRIPTION

This is a summary and update regarding the problems we've been having with our network, causing line drops for some customers, interrupting their Internet connections for a few minutes at a time. It carries on from the earlier, now out of date, post: https://aastatus.net/42577

We are not only an Internet Service Provider.

We also design and build our own routers under the FireBrick brand. This equipment is what we predominantly use in our own network to provide Internet services to customers. These routers are installed between our wholesale carriers (e.g. BT, CityFibre and TalkTalk) and the A&A core IP network. The type of router is called an "LNS", which stands for L2TP Network Server.

FireBricks are also deployed elsewhere in the core; providing our L2TP and Ethernet services, as well as facing the rest of the Internet as BGP routers to multiple Transit feeds, Internet Exchanges and CDNs.

Throughout the entire existence of A&A as an ISP, we have been running various models of FireBrick in our network.

Our newest model is the FB9000. We have been running a mix of prototype, pre-production and production variants of the FB9000 within our network since early 2022.

As can sometimes happen with a new product, at a certain point we started to experience some strange behaviour; essentially the hardware would lock-up and "watchdog" (and reboot) unpredictably.

Compared to a software 'crash' a hardware lock-up is very hard to diagnose, as little information is obtainable when this happens. If the FireBrick software ever crashes, a 'core dump' is posted with specific information about where the software problem happened. This makes it a lot easier to find and fix.

After intensive work by our developers, the cause was identified as (unexpectedly) something to do with the NVMe socket on the motherboard. At design time, we had included an NVME socket connected to the PCIE pins on the CPU, for undecided possible future uses. We did not populate the NVMe socket, though. The hanging issue completely cleared up once an NVMe was installed even though it was not used for anything at all.

As a second approach, the software was then modified to force the PCIe to be switched off such that we would not need to install NVMes in all the units.

This certainly did solve the problem in our test rig (which is multiple FB9000s, PCs to generate traffic, switches etc). For several weeks FireBricks which had formerly been hanging often in "artificially worsened" test conditions, literally stopped hanging altogether, becoming extremely stable.

So, we thought the problem was resolved. And, indeed, in our test rig we still have not seen a hang. Not even once, across multiple FB9000s.

However...

We did then start seeing hangs in our Live prototype units in production (causing dropouts to our broadband customers).

At the same time, the FB9000s we have elsewhere in our network, not running as LNS routers, are stable.

We are still working on pinpointing the cause of this, which we think is highly likely to be related to the original (now, solved) problem.

Further work...

Over the next 1-2 weeks we will be installing several extra FB9000 LNS routers. We are installing these with additional low-level monitoring capabilities in the form of JTAG connections from the main PCB so that in the event of a hardware lock-up we can directly gather more information.

The enlarged pool of LNSs will also reduce the number of customers affected if there is a lock-up of one LNS.

We obviously do apologise for the blips customers have been seeing. We do take this very seriously, and are not happy when customers are inconvenienced.

We can imagine some customers might also be wondering why we bother to make our own routers, and not just do what almost all other ISPs do, and simply buy them from a major manufacturer. This is a fair question. At times like this, it is a question we ask ourselves!

Ultimately, we do still firmly believe the benefits of having the FireBrick technology under our complete control outweigh the disadvantages. CQM graphs are still almost unique to us, and these would simply not be possible without FireBrick. There have also been numerous individual cases where our direct control over the firmware has enabled us to implement individual improvements and changes that have benefitted one or many customers.

Many times over the years we have been able to diagnose problems with our carrier partners, which they themselves could not see or investigate. This level of monitoring is facilitated by having FireBricks.

But in order to have finished FireBricks, we have to develop them. And development involves testing, and testing can sometimes reveal problems, which then affect customers.

We do not feel we were irrationally premature in introducing prototype FireBricks into our network, having had them under test not routing live customer traffic for an appropriate period beforehand.

But some problems can only reveal themselves once a "real world" level and nature of traffic is being passed. This is unavoidable, and whilst we do try hard to minimise disruption, we still feel the long term benefits of having FireBricks more-than offset the short term problems in late stage of development. We hope our detailed view on this is informative, and even persuasive.


MINOR Closed VoIP
AFFECTED
VoIP
STARTED
Mar 15, 11:10 AM (3¾ days ago)
CLOSED
Mar 15, 11:23 AM (3¾ days ago)
DESCRIPTION
We're investigating reports of call problems with one of our voice servers.
Resolution:

MINOR Closed LNS
AFFECTED
LNS
STARTED
Mar 15, 07:00 AM (4 days ago)
CLOSED
Mar 15, 07:40 AM (4 days ago)
DESCRIPTION
A 7:30AM, the X.Witless restarted causing customers on it to drop and reconnect.
Resolution: This was related to https://aastatus.net/42608 This LNS is now out of service and will be analysed by our developers.

MAINTENANCE Completed LNS
AFFECTING
LNS
STARTED
Mar 15, 04:00 AM (4 days ago)
CLOSED
Mar 15, 04:00 AM (4 days ago)
DESCRIPTION
We will be moving lines off the Z.Witless LNS at 4AM. They will reconnect to a different LNS.
Resolution: This work was completed.

MAINTENANCE Completed L2TP
AFFECTING
L2TP
STARTED
Mar 14, 03:00 AM (5 days ago)
CLOSED
Mar 14, 03:10 AM (5 days ago)
DESCRIPTION
We will be performing software upgrades on our L2TP routers - l2tp.aa.net.uk. These will be scheduled for between 3AM and 4:30AM on Thursday this week. L2TP customers will see their connection drop and reconnect twice during this period.
Resolution: This was completed at 03:10