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LNS Switches: Difference between revisions
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This article is rather technical and covers the way we connect to BT for broadband links.
The LNS handles authentication (logging in using your username and password) and routing of your IP addresses to you. It handles the negotiation of the link with your equipment and establishes a session.
[[File:FB9000-prototype-front.width-1280.jpg|frameless]]
==Multiple LNS links to BT, TT, CityFibre and mobile==
We operate multiple LNSs connected to multiple links in to carriers. This is partly for redundancy (if one of the LNSs or links break) and partly for load (to handle
The number of LNSs we run has grown over time with four in 2012, seven in April 2016, nine in January 2017, twelve in November 2017, 14 in September 2018, 23 in 2020! However in 2024, this number was reduced down when we upgraded from FB6000 to FB9000 hardware.
*9 FB6000: A-I.Gormless
The LNSs named 'Witless' handle faster FTTP and G.Fast circuits, whilst the 'Gormless' LNS handle the rest, including mobile data SIMs.
The LNS named 'Doubtless' and 'B.Doubtless' are test LNSs.
Normally we run with n+1 live LNSs and so this leaves one as a backup in case of failure.
==Maintenance and LNS switches==
Where you have multiple lines and we do an LNS switch over night, they will be switched based on the preferred time you have selected. However, once one line on a multi-line site has been switched, then next line will be switched within a few minutes of the first line coming up. This means that you do not have a long period where the lines are split between LNSs. This happens even if the other lines have a later time during the night preferred, but only after at least one line has come on line.
==Choosing the Time==
CityFibre connections tend to get moved at 4AM.
For other connection types: You can set the preferred time for the reconnect to happen to your own line(s), the default is 1AM. There is a setting on the control pages for this:
{{CPbox|#Click on the line you want to view
#Click on your login (e.g. abc@a)
#Set the 'LNS reset'. You can choose a time between 1AM and 6AM}}
==Test LNS==
Usually this creates a good graph for the previous day. However, in some cases the previous day on one of the LNSs may have been deleted before archive. In some cases the two LNS may operate on a different scale and so the combined graph looks messy and confusing. In some cases we change the graph format slightly and this can also lead to a messy graph.
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