Fiber Connectivity CISCO SF102-24 and 2960X

Posted on 2014-08-25
Last Modified: 2014-08-27

 I came out with a little issue.
 I have a CISCO SF102-24 with MGBSX1 SFP
 and a CISCO Catalyst 2960x with GLC-SX-MMD SFP
 There is a 100m multimode fiber between them with 4 fiber cables , so I have two available connections if by any means one goes down.

  The problem is that I have no link between them, as the SF102-24 switch is unmanaged I can't do anything to it, but I am thinking that maybe on the 2960X there is an option that I must put in order for the link to go up.
  I have the latest firmware on the 2960x also. And the config looks like this:

interface GigabitEthernet0/49

Question by:andreitex
    LVL 20

    Accepted Solution

    Unless one of the SFP's are bad, the most common reason for no link on fiber is due to the fiber pair being flipped. Reverse the fiber on one end. Another possibility is a bad label on the fiber which would lead to you plugging in the wrong fibers altogether.

    Other than that, there shouldn't be any reason you don't get link light.
    LVL 2

    Author Closing Comment

    You are right. We changed the cables on one end and now everything is working.

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