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can't make the sfp work on the m4100-26g-poe
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 p...
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.
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.
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?)
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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