3 devices, one network

RouterOS Beginner Basics
1

Hi all.

RouterOS n00b here.

Hardware:
1x CRS125-24G-1S-2HnD-IN
1x CRS109-8G-1S-2HnD-IN
1x CRS210-8G-2S+IN
4x Mikrotik 1.25Gb/s Single.Mode SFP 20KM
2x pre-terminated 100M fiber optic cables.


I was hoping everything would just work, and all i’d have to do is disable dhcp server on the two devices. Ok, obviously that was a fail.
S1 will sit in a little closet with customers server plugged into it, and two fiber connections coming from S2 and R1 located elsewhere in the building.

I guess if this was a cisco router and two switches, i’d just have to setup the SFP ports as trunk ports bam job done. But in RouterOS, I’m lost.
I’ve been digging around for a couple hours, googled, asked on IRC (probably not the right questions). I’m stuck.

What would be the best way to configure this?
How do I configure the SFP ports so they are all trunk links?
Any advice, clues, direction would be Very Much appreciated!!!


Please help.

Thank you!!!


Edit:
CRS210 shows both SFP ports link as active and running. with leds under the sfp ports ON.
CRS125 and CRS109 show SFP ports as “no link” with LEDs OFF.

2

You mention trunks, are you running multiple VLANs, or is this all just plain single LAN and S1 & S2 are operating just as simple switches without any router functionality?

3

Plain simply LAN, with s1 and s2 operating as switches.

so little update, somehow i got the crs125 and crs210 communicating over sfp. but the 109 won’t get it up for some reason.
Will have to play with it some more, maybe reset to defaults.

4

Well…

According to our supplier,
the CRS210 has two 10G SFP+ ports.
And only one of these ports is configurable as 1G connection, but the other only as 10G.

5

Right off the Mikrotik website about the 210:

two SFP+ cages for 10G connectivity (first port supports 1.25G/10G modules, second port only 10G modules)

Looking at the website, it looks like the 109 and 125 are 1Gig only, so you have a problem!
Don’t think I have a good solution except to use a media converter to connect your fiber to an ethernet port on the 210 rather than fiber into an SFP port.

6

I’d also strongly advise against “Mikrotik 1.25Gb/s Single.Mode SFP 20KM” on such short distances.

You will eventually blow the SPFs, unless attenuates are on the cables.

7

Thanks for the tips and advise.

Can’t we turn power down on these sfps?


Regardless, after swapping the 210 for a 112, I have a different problem now.
And a bizarre one at that.




Settings seem to match up between ports, and what not. I don’t understand why this is happening.