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Beginner

3750x not recognizing SFP

Good morning,

 

I was working on getting two different switch stacks connected using a twinax cable from Startech: https://www.amazon.com/StarTech-com-Compliant-Direct-Attach-Twinax-Cable/dp/B0781VC664/ref=sr_1_5?keywords=startech+sfp+twinax&qid=1574353695&s=electronics&sr=1-5 

However, one switch isn't recognizing the SFP in either of the 10G ports that I've plugged it into. It just shows up as "Not Present" but the ports work with a different connection from another switch. 

I've checked to make sure the port isn't err-disabled and even used the "no errdisable detect cause gbic-invalid" command. Any other ideas or is there some kind of compatibility issue I'm not aware of?

 

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1 ACCEPTED SOLUTION

Accepted Solutions
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Beginner

Re: 3750x not recognizing SFP

I managed to get the cable working by updating to 15.2(4)E9. Soon as the new image was loaded the connections came up from the twinax cable between the two switches. 

View solution in original post

7 REPLIES 7
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Hall of Fame Expert

Re: 3750x not recognizing SFP

Hi,

Is the nonworking switch using the same version of IOS as the working one?

Also, not every 3rd party products work with Cisco switches. 

I use this site and their products works well with Cisco.

https://www.fs.com/

HTH

Highlighted
Beginner

Re: 3750x not recognizing SFP

Yes, they are the same IOS versions. 

Highlighted
Hall of Fame Expert

Re: 3750x not recognizing SFP

OK, than may want to try a different cable, if not get one from a different vendor and try again.

HTH

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Hall of Fame Community Legend

Re: 3750x not recognizing SFP

I do believe 3750X don't support TwinAx.
Highlighted
Beginner

Re: 3750x not recognizing SFP

I had found the transceiver under the Cisco optics compatibility matrix: https://tmgmatrix.cisco.com/?si=3750&os=48 PID is sfp-h10gb-acu10m but I have an older IOS version than what's recommended. I upgraded the stack and now the SFP is showing up under inventory and not as "Not Present". Going to update the other stack and see if that'll make the cable work..

Highlighted
Beginner

Re: 3750x not recognizing SFP

I managed to get the cable working by updating to 15.2(4)E9. Soon as the new image was loaded the connections came up from the twinax cable between the two switches. 

View solution in original post

Highlighted
Hall of Fame Expert

Re: 3750x not recognizing SFP

Glad to know you got it all working!

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