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Standard User RAY21
(newbie) Fri 31-Dec-21 20:52:27
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Replacing BT's router with a switch - what is required?


[link to this post]
 
I wanted to replace the BT router with a switch that has an SFP port.

Can network switches work with the Openreach modem?

Or must a network switch require PPPOE functionality to work?
Standard User Pheasant
(knowledge is power) Fri 31-Dec-21 21:16:07
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Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
SFP or not you need either a router or a Layer 3 switch with routing functionality.

You cannot just plug a layer 2 switch directly into the ONT even with providers like Sky or TalkTalk (resi) that don’t use PPPoE for authentication.
Standard User RAY21
(newbie) Fri 31-Dec-21 21:37:47
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Re: Replacing BT's router with a switch - what is required?


[re: Pheasant] [link to this post]
 
In reply to a post by Pheasant:
SFP or not you need either a router or a Layer 3 switch with routing functionality.

You cannot just plug a layer 2 switch directly into the ONT even with providers like Sky or TalkTalk (resi) that don’t use PPPoE for authentication.

Are you aware of any reasonably priced network switches with routing functionality with SFP?


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Standard User Pheasant
(knowledge is power) Fri 31-Dec-21 21:50:52
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Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
What do you want the SFP for? The ONT is a copper connection.
Standard User candlerb
(fountain of knowledge) Sat 01-Jan-22 09:20:55
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Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
In reply to a post by RAY21:
Are you aware of any reasonably priced network switches with routing functionality with SFP?


What you mean is, a router with built-in switch. Most routers have multiple "LAN" ports and can switch between them.

The Mikrotik hEX S or hEX PoE each have a 1G SFP port, and five RJ45 ethernet ports connected to an internal switch. They're not fast enough to route a 1G connection, especially the single-core hEX PoE, but should be fine for about 300M, and are very cheap.

(Actually, on those devices switching between the RJ45 ports is done in hardware at line speed, but traffic going to and from the SFP port will go via the CPU, whether it's routed or switched)

The Mikrotik RB4011iGS+RM is very powerful (4 ARM cores) and can handle a gigabit with ease. This has a 10G SFP+ port (which should also work as a 1G SFP), and ten ethernet ports, one of which can provide PoE.

Those solutions only give you a single SFP port. There are more expensive routers with multiple SFP ports. As someone else has already said, the question is what do you want to use the SFP port for? Are you running your own fibre link to another building perhaps?

The other way you can handle this is with an external switch back-to-back with your existing router. For example, buy a Netgear GS110TP: this has 8 ethernet ports (all PoE out incidentally) and two SFP ports. You can run a copper CAT5e cable from the switch to your existing router's LAN port, and then the switch will give you an additional 2 SFP and 7 ethernet ports.

The GS724Tv4 is similar price and gives you 24 copper ethernet (non-PoE) and 2 SFP.

Both those Netgear switches are managed and can do VLANs and SNMP.
Standard User jpm
(committed) Sat 01-Jan-22 09:43:00
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Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
In reply to a post by RAY21:
In reply to a post by Pheasant:
SFP or not you need either a router or a Layer 3 switch with routing functionality.

You cannot just plug a layer 2 switch directly into the ONT even with providers like Sky or TalkTalk (resi) that don’t use PPPoE for authentication.

Are you aware of any reasonably priced network switches with routing functionality with SFP?


What are you hoping to achieve? What's the desired end goal here?
Standard User Pheasant
(knowledge is power) Sat 01-Jan-22 11:52:54
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Re: Replacing BT's router with a switch - what is required?


[re: jpm] [link to this post]
 
That is indeed the correct approach.

Just had a quick scan of the OPs other recent posts and though not mentioned in this thread specifically, “joining the dots” think I’m getting the gist of the SFP query; looks like they have an outbuilding that they wish to connect to their network. So perhaps an outdoor optical link?
Standard User deleted
(deleted) Sun 02-Jan-22 10:14:11
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Re: Replacing BT's router with a switch - what is required?


[re: candlerb] [link to this post]
 
Generally how hard is it for an average Joe to setup a Mikrotik RB4011iGS+RM

Edit: and is there any additional overheads on maintaining it.

Edited by deleted (Sun 02-Jan-22 10:18:32)

Standard User candlerb
(fountain of knowledge) Sun 02-Jan-22 10:32:46
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Re: Replacing BT's router with a switch - what is required?


[re: deleted] [link to this post]
 
For Average Joe I would *always* say "use the ISP supplied router". No question of that. The ISP router *will* work, and if it doesn't, it's the ISP's problem to fix it - not Joe's. If Joe wants better wifi coverage, and the ISP doesn't offer a wifi extension solution, then plug separate wifi access point(s) into the router.

As for Mikrotik, it offers three different config options: Winbox (a Windows-based client), Web interface, and command line interface.

I think all three are accessible given the concepts underlying them. That is: if you're going to configure routing or switching, you should at least know what a router or a switch does.
Mikrotik's interface is not dumbed down like a typical ISP-supplied router, but neither is it difficult to use if you know what you're trying to do - and in the case of the CLI, you're not expecting it to be like a Cisco.

Incidentally, the specific Mikrotik routers I listed don't have wifi at all. There are some Mikrotik models that do have integrated wifi, but I've never used them. I choose my wifi APs separately.
Standard User deleted
(deleted) Sun 02-Jan-22 11:03:05
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Re: Replacing BT's router with a switch - what is required?


[re: candlerb] [link to this post]
 
For me I worry about accidentally leaving a door open somewhere on the router that lets unwanted guests in frown

Don't need to make a decision yet but do need to fibre link one of my barns to my house sometime this year and was looking at either a router like the Mikrotik that has a SFP port or stay with a ISP router and upgrade my switch to one that has a SFP port.

Edited by deleted (Sun 02-Jan-22 11:03:24)

Standard User candlerb
(fountain of knowledge) Sun 02-Jan-22 12:46:52
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Re: Replacing BT's router with a switch - what is required?


[re: deleted] [link to this post]
 
In reply to a post by dect:
For me I worry about accidentally leaving a door open somewhere on the router that lets unwanted guests in frown


Do you mean unauthorized access to your router, or to your internal network?

To your router: Mikrotik makes that pretty easy. All traffic to the router itself (i.e. any of its own interface addresses) hits the "input" chain, so you put a rule which blocks everything except your LAN addresses.

To your internal network: routers and firewalls these days can offer little or no protection anyway. That's because the primary routes for attack are (1) clicking on infected links in web pages, and (2) clicking on infected attachments in E-mails. Both of these are making "outbound" connections to the Internet, which are usually allowed unconditionally, are generally encrypted (HTTPS or IMAPS). The firewall or router can do nothing about this.

Your best bet is to assume that you *are* going to be infected, and then to detect it - e.g. with an IDS - and clean up.
Standard User deleted
(deleted) Sun 02-Jan-22 14:49:03
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Re: Replacing BT's router with a switch - what is required?


[re: candlerb] [link to this post]
 
In reply to a post by candlerb:
Do you mean unauthorized access to your router, or to your internal network?
Thanks, I was referring to both.

The thought of someone rattling my router ports and finding a vulnerability (because of my configuration) that gives them access to my router or internal network is what concerns me about going for something like a Mikrotik or a product running something like pfsense. I appreciate that a lot of issues are now caused by the internal users clicking infected links or opening iffy attachments but thats the same regardless of what router you have installed.
Standard User RAY21
(newbie) Sun 02-Jan-22 15:13:55
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Re: Replacing BT's router with a switch - what is required?


[re: Pheasant] [link to this post]
 
In reply to a post by Pheasant:
What do you want the SFP for? The ONT is a copper connection.

I wanted to extend my network to an outbuilding (office/games) using Fibre (OM3) via SFP.

I didn't want so many devices on the network as I thought that may introduce latency and affect performance.

Essentially I was querying whether there is a network router which will interface with the Openreach ONT modem and replace the BT router.
Standard User candlerb
(fountain of knowledge) Sun 02-Jan-22 16:30:58
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Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
In reply to a post by RAY21:
In reply to a post by Pheasant:
What do you want the SFP for? The ONT is a copper connection.

I wanted to extend my network to an outbuilding (office/games) using Fibre (OM3) via SFP.

I didn't want so many devices on the network as I thought that may introduce latency and affect performance.

Essentially I was querying whether there is a network router which will interface with the Openreach ONT modem and replace the BT router.


1. Using fibre is the right way to do this. Copper network connections between buildings are dangerous, due to induced voltages when thunderstorms are nearby.

2. The standard for 1G over fibre (1000baseLX/LH) conveniently works over both single mode (OS2) and multi mode (OM1/2/3/4), but you don't want to be installing multi mode unless you have no other option. Single mode is better in every regard, and perhaps surprisingly, it's also cheaper than multi mode. However you do want to get it ready-made, ready-terminated to the correct length.

(In the old days, if you were an enthusiast you could have a go at splicing pigtails to multi mode fibre by hand. It was a slow and painful operation, with lots of polishing involved. There's no chance of doing this for single mode)

3. Adding an extra device into the path will not make any noticeable impact on latency or performance. It *is* potentially an extra point of failure; from that point of view it's better to use a managed switch, than a dumb media converter, so you can monitor it (you can for example read the light levels from the SFP). But you definitely aren't going to notice one extra switch hop at a gigabit.

4. If you replace your BT router you will lose your voice "landline" service. Maybe you don't care about this, but it's something you at least need to consider.

5. Obviously, you'll need something with an SFP port at both ends of the link. Therefore it may be convenient to get two identical things - e.g. two Netgear GS110TP - so that you only have to learn one type of device. I like that particular device because it is fanless and has built-in PoE, so you can hang wireless access points directly off it. (But not PoE+)
Standard User RAY21
(newbie) Sun 02-Jan-22 16:48:04
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Re: Replacing BT's router with a switch - what is required?


[re: candlerb] [link to this post]
 
In reply to a post by candlerb:
In reply to a post by RAY21:
In reply to a post by Pheasant:
What do you want the SFP for? The ONT is a copper connection.

I wanted to extend my network to an outbuilding (office/games) using Fibre (OM3) via SFP.

I didn't want so many devices on the network as I thought that may introduce latency and affect performance.

Essentially I was querying whether there is a network router which will interface with the Openreach ONT modem and replace the BT router.


1. Using fibre is the right way to do this. Copper network connections between buildings are dangerous, due to induced voltages when thunderstorms are nearby.

2. The standard for 1G over fibre (1000baseLX/LH) conveniently works over both single mode (OS2) and multi mode (OM1/2/3/4), but you don't want to be installing multi mode unless you have no other option. Single mode is better in every regard, and perhaps surprisingly, it's also cheaper than multi mode. However you do want to get it ready-made, ready-terminated to the correct length.

(In the old days, if you were an enthusiast you could have a go at splicing pigtails to multi mode fibre by hand. It was a slow and painful operation, with lots of polishing involved. There's no chance of doing this for single mode)

3. Adding an extra device into the path will not make any noticeable impact on latency or performance. It *is* potentially an extra point of failure; from that point of view it's better to use a managed switch, than a dumb media converter, so you can monitor it (you can for example read the light levels from the SFP). But you definitely aren't going to notice one extra switch hop at a gigabit.

4. If you replace your BT router you will lose your voice "landline" service. Maybe you don't care about this, but it's something you at least need to consider.

5. Obviously, you'll need something with an SFP port at both ends of the link. Therefore it may be convenient to get two identical things - e.g. two Netgear GS110TP - so that you only have to learn one type of device. I like that particular device because it is fanless and has built-in PoE, so you can hang wireless access points directly off it. (But not PoE+)

Thanks for the explanation, this is much more clearer to me now.

I've just had a look at FS.com; OS2 cables seem to be significantly cheaper than their OM3/OM4 counterparts. I was planning to get these 'armored' cables - I like the fact they have multiple connectors for redundancy.

I did not know that the landline/phone service was tied to the BT router. So in this case, any 'network switch' with built in SFP would the preferred option. I should note I have not yet ordered FTTP although I expect to receive connectivity in a few months on a new build so wanted to ensure I had everything in place by the time I move in!

Would the correct path of installing these products go like this?

Openreach modem ->
BT Hub ->
Switch
-> SFP - > 2nd Switch -> TV/PC/PS5 (Outbuilding)
-> Household devices/TV etc (Main house)

Would 'piggybacking' the BT hub via the Netgear Switch (or any switch for that matter) cause a bottleneck as it's derived from one Ethernet port, or does that not matter?

Edited by RAY21 (Sun 02-Jan-22 16:54:50)

Standard User candlerb
(fountain of knowledge) Sun 02-Jan-22 17:02:39
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Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
In reply to a post by RAY21:
I've just had a look at FS.com; OS2 cables seem to be significantly cheaper than their OM3/OM4 counterparts. I was planning to get these 'armored' cables - I like the fact they have multiple connectors for redundancy.


Armoured cables are great for keeping the rats out. However if it has a metal shield, do make sure it's properly bonded to earth at each end. I'd still run it within trunking anyway.

With a standard SFP (e.g. this) you need two fibres: one for transmit and one for receive - so there's no "redundancy" as such by having a cable with two fibres.

You can buy "BiDi" (bidirectional) SFPs which transmit and receive on the same fibre: they have built-in filters for separating the signals, and because they transmit and receive on different wavelengths, you need different ones at each end that are mirror images of each other. I wouldn't bother unless you are trying to use a single spare fibre somewhere.

In reply to a post by RAY21:
any 'network switch' with built in SFP would suffice, correct?


Yes, any 1G ethernet switch.

In reply to a post by RAY21:
Would the correct path of installing these products go like this?

Openreach modem -> BT Hub -> Switch -> Household devices etc?


More like:

Text
1
23
Openreach ONT -- BT router -- Switch1 --------- Switch2
                    |||         |||              |||                     local devices            remote devices


In reply to a post by RAY21:
Would 'piggybacking' the BT hub via the Netgear Switch (or any switch for that matter) cause a bottleneck as it's derived from one Ethernet port, or does that not matter?


The total amount of traffic via any ethernet port is 1G (1G inbound + 1G outbound simultaneously). So that limits the total traffic to your outbuilding, and as such could be considered a "bottleneck". However unless you're trying to send more than 1G of traffic in total between your local devices and remote devices, it's not an issue.

You could make the link between your main building and outbuilding run at 10G if you want instead. The actual SFP+ module is not much more expensive; what's expensive is a switch which has 10G SFP+ ports. I'd say YAGNI, but if you install single mode fibre, you can upgrade to 10G or faster later if you want.
Standard User candlerb
(fountain of knowledge) Sun 02-Jan-22 17:16:35
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Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
In reply to a post by RAY21:
I should note I have not yet ordered FTTP although I expect to receive connectivity in a few months on a new build so wanted to ensure I had everything in place by the time I move in!


In that case there is another option for how to deal with voice, which is to use VOIP. You would need either a VOIP phone, a VOIP app, or a VOIP device (e.g. ATA or DECT base station) for your "landline", and this would work over any broadband connection.

If you don't care about keeping your existing phone number - or were already resigned to it having to change when you moved - then you can sign up for a VOIP service now, with a new phone number; test it all out, and take it with you when you move. You can then get FTTP without voice, or FTTP with voice and ignore the new number they give you. This widens your choice of providers - for example, Talktalk have a good price for 150M or 500M FTTP, but they don't include any voice service.

It's also possible to port your existing phone number to a VOIP provider, to make it completely independent from your broadband. This means you can keep your existing phone number forever, even if you're moving to a different part of the UK (or even abroad).

However, you'd have to do this before you move, and the act of porting your phone number to VOIP will automatically cease the underlying phone line and any attached broadband service. So if you're currently getting your phone calls via a copper line with FTTC on it, you'd need to be careful over the timing so as not to be without broadband for too long.
Standard User RAY21
(newbie) Sun 02-Jan-22 17:38:38
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Re: Replacing BT's router with a switch - what is required?


[re: candlerb] [link to this post]
 
In reply to a post by candlerb:
In reply to a post by RAY21:
I should note I have not yet ordered FTTP although I expect to receive connectivity in a few months on a new build so wanted to ensure I had everything in place by the time I move in!


In that case there is another option for how to deal with voice, which is to use VOIP. You would need either a VOIP phone, a VOIP app, or a VOIP device (e.g. ATA or DECT base station) for your "landline", and this would work over any broadband connection.

If you don't care about keeping your existing phone number - or were already resigned to it having to change when you moved - then you can sign up for a VOIP service now, with a new phone number; test it all out, and take it with you when you move. You can then get FTTP without voice, or FTTP with voice and ignore the new number they give you. This widens your choice of providers - for example, Talktalk have a good price for 150M or 500M FTTP, but they don't include any voice service.

It's also possible to port your existing phone number to a VOIP provider, to make it completely independent from your broadband. This means you can keep your existing phone number forever, even if you're moving to a different part of the UK (or even abroad).

However, you'd have to do this before you move, and the act of porting your phone number to VOIP will automatically cease the underlying phone line and any attached broadband service. So if you're currently getting your phone calls via a copper line with FTTC on it, you'd need to be careful over the timing so as not to be without broadband for too long.

This sounds quite complicated to be honest. I'll probably just stick with whatever phone connection BT will provide. So I guess their Smart Hub is mandatory due to this?
Standard User RAY21
(newbie) Sun 02-Jan-22 17:41:49
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Re: Replacing BT's router with a switch - what is required?


[re: candlerb] [link to this post]
 
In reply to a post by candlerb:
In reply to a post by RAY21:
I've just had a look at FS.com; OS2 cables seem to be significantly cheaper than their OM3/OM4 counterparts. I was planning to get these 'armored' cables - I like the fact they have multiple connectors for redundancy.


Armoured cables are great for keeping the rats out. However if it has a metal shield, do make sure it's properly bonded to earth at each end. I'd still run it within trunking anyway.

With a standard SFP (e.g. this) you need two fibres: one for transmit and one for receive - so there's no "redundancy" as such by having a cable with two fibres.

You can buy "BiDi" (bidirectional) SFPs which transmit and receive on the same fibre: they have built-in filters for separating the signals, and because they transmit and receive on different wavelengths, you need different ones at each end that are mirror images of each other. I wouldn't bother unless you are trying to use a single spare fibre somewhere.

In reply to a post by RAY21:
any 'network switch' with built in SFP would suffice, correct?


Yes, any 1G ethernet switch.

In reply to a post by RAY21:
Would the correct path of installing these products go like this?

Openreach modem -> BT Hub -> Switch -> Household devices etc?


More like:

Text
1
23
Openreach ONT -- BT router -- Switch1 --------- Switch2
                    |||         |||              |||                     local devices            remote devices


In reply to a post by RAY21:
Would 'piggybacking' the BT hub via the Netgear Switch (or any switch for that matter) cause a bottleneck as it's derived from one Ethernet port, or does that not matter?


The total amount of traffic via any ethernet port is 1G (1G inbound + 1G outbound simultaneously). So that limits the total traffic to your outbuilding, and as such could be considered a "bottleneck". However unless you're trying to send more than 1G of traffic in total between your local devices and remote devices, it's not an issue.

You could make the link between your main building and outbuilding run at 10G if you want instead. The actual SFP+ module is not much more expensive; what's expensive is a switch which has 10G SFP+ ports. I'd say YAGNI, but if you install single mode fibre, you can upgrade to 10G or faster later if you want.

The cables will be fed through a conduit between the two buildings.

So essentially, a normal SFP module requires a Duplex connection (2 fibre strands), and a BiDi SFP module can use a Simplex connection (1 fibre strand)? Interesting, did not know this.

Are there any advantages or disadvantages versus Simplex (BiDi) vs Duplex transmission?

Which SFP module will work the the Netgear switch and OS2 cables?

Also I found this via Google:
https://networkengineering.stackexchange.com/questio...

Can 3 ethernet cables actually connect to the Netgear switch, and create separate VLANs as a result?

Edited by RAY21 (Sun 02-Jan-22 18:08:02)

Standard User candlerb
(fountain of knowledge) Sun 02-Jan-22 17:57:55
Print Post

Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
In reply to a post by RAY21:
This sounds quite complicated to be honest. I'll probably just stick with whatever phone connection BT will provide. So I guess their Smart Hub is mandatory due to this?


Yes. Ditto if you take service from Sky, Zen or Vodafone, who are the other main players who'll sell you FTTP with voice.

In reply to a post by RAY21:
Which SFP module will work the the Netgear switch and OS2 cables?


The one I linked to before: 1000baseLX (sometimes known as 1000baseLH)

In reply to a post by RAY21:
Also I found this via Google:
https://networkengineering.stackexchange.com/questio...

Can 3 ethernet cables actually connect to the Netgear switch, and create separate VLANs as a result?


Ergh. This question is too complicated for a simple answer.

Separate cables can indeed carry separate VLANs - which would be separate IP subnets. You can also carry multiple VLANs on a single cable, using VLAN tagging where each packet is marked with the VLAN it belongs to.

Connecting three cables directly between two switches can make bad things happen: normally two of them will be shut down by spanning tree to avoid loops, unless you configure a link aggregation group.

However all this is irrelevant if the BT router doesn't let you create multiple LAN subnets and route between them. I would suspect not, as it will be dumbed down for a consumer connection, but I don't have one to check against.

If you want multiple subnets, you're out of the "Average Joe" category and you need to start learning about IP routing. And that's where having a more powerful and flexible router comes into play.
Standard User Realalemadrid
(committed) Sun 02-Jan-22 18:04:39
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Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
Please can you clarify what Broadband service you have. Do you have a normal copper phone line and an Openreach FTTC modem?

A lot of the responses in this thread seem to assume you have a Full Fibre FTTP service with an Openreach ONT (Optical Network Terminator). BT retail FTTP Phone provision is now generally a VOIP service, it is this that requires the BT Smarthub to provide the phone service.

If you have a copper line and FTTC then you can use any router.

I have, purely as an interesting exercise used a couple of Lancom routers with SFP ports to create a Fibre Optic link using TP-Link Bidirectional SFP modules.
Standard User RAY21
(newbie) Sun 02-Jan-22 18:11:54
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Re: Replacing BT's router with a switch - what is required?


[re: Realalemadrid] [link to this post]
 
In reply to a post by Realalemadrid:
Please can you clarify what Broadband service you have. Do you have a normal copper phone line and an Openreach FTTC modem?

A lot of the responses in this thread seem to assume you have a Full Fibre FTTP service with an Openreach ONT (Optical Network Terminator). BT retail FTTP Phone provision is now generally a VOIP service, it is this that requires the BT Smarthub to provide the phone service.

If you have a copper line and FTTC then you can use any router.

I have, purely as an interesting exercise used a couple of Lancom routers with SFP ports to create a Fibre Optic link using TP-Link Bidirectional SFP modules.

Yes it's based on the BT FTTP service with ONT as I wanted to extend my network to a seperate building with fibre; I originally thought replacing the Smart Hub with a router with an inbuilt SFP was the best way to go. I know most people who extend to an outbuilding with fibre use media converters but wanted to avoid that.

Edited by RAY21 (Sun 02-Jan-22 18:15:37)

Standard User RAY21
(newbie) Sun 02-Jan-22 18:14:26
Print Post

Re: Replacing BT's router with a switch - what is required?


[re: candlerb] [link to this post]
 
In reply to a post by candlerb:
In reply to a post by RAY21:
This sounds quite complicated to be honest. I'll probably just stick with whatever phone connection BT will provide. So I guess their Smart Hub is mandatory due to this?


Yes. Ditto if you take service from Sky, Zen or Vodafone, who are the other main players who'll sell you FTTP with voice.

In reply to a post by RAY21:
Which SFP module will work the the Netgear switch and OS2 cables?


The one I linked to before: 1000baseLX (sometimes known as 1000baseLH)

In reply to a post by RAY21:
Also I found this via Google:
https://networkengineering.stackexchange.com/questio...

Can 3 ethernet cables actually connect to the Netgear switch, and create separate VLANs as a result?


Ergh. This question is too complicated for a simple answer.

Separate cables can indeed carry separate VLANs - which would be separate IP subnets. You can also carry multiple VLANs on a single cable, using VLAN tagging where each packet is marked with the VLAN it belongs to.

Connecting three cables directly between two switches can make bad things happen: normally two of them will be shut down by spanning tree to avoid loops, unless you configure a link aggregation group.

However all this is irrelevant if the BT router doesn't let you create multiple LAN subnets and route between them. I would suspect not, as it will be dumbed down for a consumer connection, but I don't have one to check against.

If you want multiple subnets, you're out of the "Average Joe" category and you need to start learning about IP routing. And that's where having a more powerful and flexible router comes into play.

Gotcha, thanks.

I'll set up the network as you suggested (with some devices directly from the BT Smart Hub, and then an added switch which will relay to another switch via SFP).
Standard User RAY21
(newbie) Sun 02-Jan-22 20:02:47
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Re: Replacing BT's router with a switch - what is required?


[re: Realalemadrid] [link to this post]
 
In reply to a post by Realalemadrid:
I have, purely as an interesting exercise used a couple of Lancom routers with SFP ports to create a Fibre Optic link using TP-Link Bidirectional SFP modules.

In reply to a post by candlerb:
Armoured cables are great for keeping the rats out. However if it has a metal shield, do make sure it's properly bonded to earth at each end. I'd still run it within trunking anyway.

With a standard SFP (e.g. this) you need two fibres: one for transmit and one for receive - so there's no "redundancy" as such by having a cable with two fibres.

You can buy "BiDi" (bidirectional) SFPs which transmit and receive on the same fibre: they have built-in filters for separating the signals, and because they transmit and receive on different wavelengths, you need different ones at each end that are mirror images of each other. I wouldn't bother unless you are trying to use a single spare fibre somewhere.

Just to follow on the Normal SFP vs BiDi SFP, is there any advantages or disadvantages between the Simplex or Duplex Fibre cable?

Using a single fibre core is much cheaper. I could get 4 strands for £62 from FS.com

What would be considered a more reliable/faster connection?

Edited by RAY21 (Sun 02-Jan-22 20:05:48)

Standard User Pheasant
(knowledge is power) Sun 02-Jan-22 20:48:27
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Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
Get some spare cores chap. I’d recommend a minimum of a 4 core cable. The difference is cost is feck all squared. You’ll be glad of it in future.
Standard User Pheasant
(knowledge is power) Sun 02-Jan-22 22:28:00
Print Post

Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
In reply to a post by RAY21:
In reply to a post by Realalemadrid:
I have, purely as an interesting exercise used a couple of Lancom routers with SFP ports to create a Fibre Optic link using TP-Link Bidirectional SFP modules.

In reply to a post by candlerb:
Armoured cables are great for keeping the rats out. However if it has a metal shield, do make sure it's properly bonded to earth at each end. I'd still run it within trunking anyway.

With a standard SFP (e.g. this) you need two fibres: one for transmit and one for receive - so there's no "redundancy" as such by having a cable with two fibres.

You can buy "BiDi" (bidirectional) SFPs which transmit and receive on the same fibre: they have built-in filters for separating the signals, and because they transmit and receive on different wavelengths, you need different ones at each end that are mirror images of each other. I wouldn't bother unless you are trying to use a single spare fibre somewhere.

Just to follow on the Normal SFP vs BiDi SFP, is there any advantages or disadvantages between the Simplex or Duplex Fibre cable?

Using a single fibre core is much cheaper. I could get 4 strands for £62 from FS.com

What would be considered a more reliable/faster connection?

Catching up with this thread. You’ve had some good advice above. Forget multimode fibre. Always single-mode.

The main advantage that you have with BiDi’s here is more spare capacity available on the cable for other uses - why use 2 cores when you could use 1. For example you could use a spare fibre core for fibre integrated reception for satellite + terrestrial TV, radio etc. which is what I use. Quite neat especially for building to building rather than lossy coax.

BiDi SFP really aren’t any more expensive than traditional separate Tx/Rx SFPs especially at gigabit rates. Bit more at 10 or 25 Gbit but that’s neither here nor there.

UI do a pretty inexpensive plug and go BiDi bundle around £23. These will work with the Mikrotik or Netgear kit mentioned above. They are pretty compatible beasts.

My other recommendation would be to get a fibre cleaning pen to clean the ferrules before use. Get one in the size you need for either 1.25mm or 2.5mm size ferrules. Will save you a ton a grief.
Standard User RAY21
(newbie) Mon 03-Jan-22 15:03:12
Print Post

Re: Replacing BT's router with a switch - what is required?


[re: Pheasant] [link to this post]
 
In reply to a post by Pheasant:
In reply to a post by RAY21:
In reply to a post by Realalemadrid:
I have, purely as an interesting exercise used a couple of Lancom routers with SFP ports to create a Fibre Optic link using TP-Link Bidirectional SFP modules.

In reply to a post by candlerb:
Armoured cables are great for keeping the rats out. However if it has a metal shield, do make sure it's properly bonded to earth at each end. I'd still run it within trunking anyway.

With a standard SFP (e.g. this) you need two fibres: one for transmit and one for receive - so there's no "redundancy" as such by having a cable with two fibres.

You can buy "BiDi" (bidirectional) SFPs which transmit and receive on the same fibre: they have built-in filters for separating the signals, and because they transmit and receive on different wavelengths, you need different ones at each end that are mirror images of each other. I wouldn't bother unless you are trying to use a single spare fibre somewhere.

Just to follow on the Normal SFP vs BiDi SFP, is there any advantages or disadvantages between the Simplex or Duplex Fibre cable?

Using a single fibre core is much cheaper. I could get 4 strands for £62 from FS.com

What would be considered a more reliable/faster connection?

Catching up with this thread. You’ve had some good advice above. Forget multimode fibre. Always single-mode.

The main advantage that you have with BiDi’s here is more spare capacity available on the cable for other uses - why use 2 cores when you could use 1. For example you could use a spare fibre core for fibre integrated reception for satellite + terrestrial TV, radio etc. which is what I use. Quite neat especially for building to building rather than lossy coax.

BiDi SFP really aren’t any more expensive than traditional separate Tx/Rx SFPs especially at gigabit rates. Bit more at 10 or 25 Gbit but that’s neither here nor there.

UI do a pretty inexpensive plug and go BiDi bundle around £23. These will work with the Mikrotik or Netgear kit mentioned above. They are pretty compatible beasts.

My other recommendation would be to get a fibre cleaning pen to clean the ferrules before use. Get one in the size you need for either 1.25mm or 2.5mm size ferrules. Will save you a ton a grief.

I don't suppose there is any difference in speed/quality/reliability between using BiDi (1 core) versus traditional Duplex?

The former does sound more tempting as I'll be able to have more cables as redundancy (4 'single' fibre cores).

Does anyone know if the BT Smart Hub router is capable of link aggregation? The idea of using two Ethernet cables directed to my switch sounds nice to increase bandwidth.
Standard User j0hn83
(knowledge is power) Mon 03-Jan-22 15:11:40
Print Post

Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
In reply to a post by RAY21:
Does anyone know if the BT Smart Hub router is capable of link aggregation? The idea of using two Ethernet cables directed to my switch sounds nice to increase bandwidth.


Definitely not.
Standard User Pheasant
(knowledge is power) Mon 03-Jan-22 15:16:46
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Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
In reply to a post by RAY21:
I don't suppose there is any difference in speed/quality/reliability between using BiDi (1 core) versus traditional Duplex?

The former does sound more tempting as I'll be able to have more cables as redundancy (4 'single' fibre cores).

No there is no difference in speed and/or quality. BiDi’s have been used on leased line circuits for years. They are completely reliable.

Edit: your GPON service from Openreach is effectively a BiDi circuit.

Edited by Pheasant (Mon 03-Jan-22 15:20:20)

Standard User ft247
(member) Mon 03-Jan-22 15:22:12
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Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
In reply to a post by RAY21:
I don't suppose there is any difference in speed/quality/reliability between using BiDi (1 core) versus traditional Duplex?

The difference for me is convenience and ease of troubleshooting, a BiDi is much more likely to either 'work or not' due to the fibre path being either sufficient or insufficient. No reverse patching, far fewer permutations to try when there is poor labelling etc.

If they were much more expensive I'd reserve them for specialist cases, but in small quantities the price difference is negligible.

Duplex is perfectly serviceable stuff though, nothing wrong with it. Once installed and working there is no functional difference.
Standard User Pheasant
(knowledge is power) Mon 03-Jan-22 17:35:58
Print Post

Re: Replacing BT's router with a switch - what is required?


[re: RAY21] [link to this post]
 
Does anyone know if the BT Smart Hub router is capable of link aggregation? The idea of using two Ethernet cables directed to my switch sounds nice to increase bandwidth.

Thing is even if the BT router did (support LAG) it wouldn’t really make any difference to your internet connection as that is < 1 Gbps.

On a network switch if you had for example a NAS connected with multiple Gbps ports arranged as a LAG or a 10 Gbps connection then under heavy usage you would see a benefit with multiple Gbps connected clients simultaneous access to the NAS or a single client (if it also had > Gbps connectivity)

LAG is also useful for inter-switch links or where you are stacking switches.
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