How to make 2 switches talk after connecting with fiber?

[Adam_Joseph]

Hi

First off, I'm very new to this, so please bear with me as I'm learning. I've tried to research this but I don't know the keywords I need.

I have 2 Summit X250e-48P switches. I have managed to create a VLAN, set a DHCP scope, and connect devices. They work great individually.

I have connected them together via the SFP slots with LC connectors (labeled for use with Extreme switches).

Should that be it, or do I need to configure the SFP ports?

Sorry if I haven't given enough information.

[Adam_Joseph]

they don't seem to be changeable on the patch cables i'm using. and the same patch cables are working with the other swicth on the same modules.

[Nick_Yakimenko]

They are for duplex (dual) fiber? Try change tx/rx (left/right) fibers

[Adam_Joseph]

OK, without any configuration, when i connect a single fiber cable it works fine. When I go through my fiber patch panel, it doesn't.

However, if I connect it to an existing switch on a different network, the link is active. All 8 fiber patch cores work fine, so that's not the issue. I find it bizarre that it will talk to my other switch, but not the one I want it to.

Is there a reason it would work over a 1m fiber cable and not a 80m cable, except for the SPF module? Because I have 6, 4 are rated 10k and the other 2 550m. And the module works fine when connecting to the switch on the other network.

Any input would be great, thanks.

[Nick_Yakimenko]

you should not mess SM and MM modules,also carefully read other rates on SFP modules, especially those, who work on a single fiber (WDM)
Those who are for 550m are probably for MM fiber, 850nm wave, dual fiber
Others use TX1310/RX1550 (blue ones) and vise-versea (TX1550/RX1310nm, violet ones)

You should find out which fiber is used between fiber patch panels: singlemode or multimode
And which patchcords you use: traditionally orange are for multimode, yellow are for singlemode

[Adam_Joseph]

great, i'll try this out next week. Thanks!