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can't make the sfp work on the m4100-26g-poe
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Hello,
I hope somebody can help me.
I am having troubles connecting a 10GB Copper SFP to a M4100-26G-POE
I have connected the SFP to port 26 (the last port on the bottom right) and I have not plugged any cable to ports rj45 (23-26) because it seesm those last ports are shared between the RJ45 and the SFP (so, just in case I have nothing connected there)
I then connect an rj45 cable to the SFP module that is on the switch (port 26) and the other side I connect to my server (that also supports 10GB) I see that it syncs at 10GB however I have no connection at all.
When I connect the same server port to one of the other 1GB port of the switch works perfectly.
I then look at the status of the ports in the switch and it says inactive on port 26, when I look at the logs it does not even track that there was a port state change, nothing. It is has it's nothing there.
I have tried also the sfp module on port 25 and the same result, I have already rebooted the switch a pair of times just in case it needed, but I really don't know what else to do.
The SFP module that I have here is the following (Ipolex for 10GbE 10GBase-T:30m),
https://smile.amazon.de/gp/product/B078WLTX26/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
Could it be a compatibily issue? I discarded that option because In the description of the SFP module says, its compatible with Netgear switches, and also I see in the status of my server that it syncs at 10Gbit (ethtool eno1np0)
Do I need to do any configuration on my netgear switch? I am lost, don't know what else to do.
Thanks for any help
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Unfortunately no. By rule of thumb, SFP+ slots can take SFP modules (for Gb fiber links for example to connect an SFP and an d SFP+ device), but SFP slots can't take SFP+ modules.
As I said, SFP resp. SFP+ does not have a link speed negotiation, it's an (out of band when I have it right) control protocol between the module and the host. SFP can do Gigabit, host permitting also 100 Mb/s in an SFP slot, SFP+ can to 10G and 1G (host permitting again) in an SFP+ slot.
Before you are running crazy, be aware there are SFP+ RJ45 copper modules supporting MultiGig on the copper link - this does on the vast majority of SFP+ devices (switches) not work, as most support 10G and 1G only but _not_ MultiGig on the SFP+ slots.
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Re: can't make the sfp work on the m4100-26g-poe
At no point, the M4100-26G-PoE does support anything beyond of Gigabit. All M4100 ports, including the SFP slots, are Gigabit Ethernet only (one model verion has Fast Ethernet ports) - the SFP slots offer "100Mbps backward compatiblity on all SFP ports". -> M4100 Series Data Sheet
SFP+ modules are not workable on SFP modules.
Don't get confused about the fact that the SFP+ RJ45 modules are when powered on SFP ports auto-negotiate the link between the two modules. On the SFP/SFP+ host side, there is no such autonegotiaion, just like on fiber.
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Re: can't make the sfp work on the m4100-26g-poe
Damn, I don;t believe how noob I am...
For some strange reason, I was with the impression that the SFP ports support 10gb
Thanks for the reply 🙂
Just another question, should those SFP ports not work at least at 1GB? (obviously not at 10gb since it's not supported, but should they not work at least at 1gb?)
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Unfortunately no. By rule of thumb, SFP+ slots can take SFP modules (for Gb fiber links for example to connect an SFP and an d SFP+ device), but SFP slots can't take SFP+ modules.
As I said, SFP resp. SFP+ does not have a link speed negotiation, it's an (out of band when I have it right) control protocol between the module and the host. SFP can do Gigabit, host permitting also 100 Mb/s in an SFP slot, SFP+ can to 10G and 1G (host permitting again) in an SFP+ slot.
Before you are running crazy, be aware there are SFP+ RJ45 copper modules supporting MultiGig on the copper link - this does on the vast majority of SFP+ devices (switches) not work, as most support 10G and 1G only but _not_ MultiGig on the SFP+ slots.