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Ask questions and share experiences about EX and QFX portfolios and all switching solutions across your data center, campus, and branch locations.

  • 1.  LR SFP's not working on EX Series

    Posted 03-14-2024 09:52

    Hi, We have a 1gig direct connection termination on Cienna device. ISP installed a 10gig LR SFP on Cienna and we are using single mode fiber to connect it to Juniper EX4400-24T series switch. I tried to match SFP on Juniper side and link doesn't come up.

    With 10gig LR SFP on Juniper, there is not even LED light coming from SFP when inserted into port (This answers my first question). If I switch that LR with SFP+-10G-USR, I see LED coming from SFP but i can't have LR on Cienna and SR on Juniper. 

    Are there any compatibility issues with LR's and Juniper EX series switches?

    Also, receive power seems odd but i think i should worry about that later once i figure out Juniper working with SR and not LR.

    Physical interface: xe-1/2/3
        Laser bias current                        :  4.746 mA
        Laser output power                        :  0.4250 mW / -3.72 dBm
        Module temperature                        :  42 degrees C / 108 degrees F
        Module voltage                            :  3.2670 V
        Laser receiver power                      :  0.0001 mW / -40.00 dBm



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    SIVA PRABHALA VENKATA
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  • 2.  RE: LR SFP's not working on EX Series

    Posted 03-22-2024 17:10

    You may need to cross the transmit and recieve at one end of you fiber cable linking the switch to the device.  In our new installs of 10gig fiber and optics, we had to do that for the links to come up. 



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    JOHN WILLIAMSON
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    Original Message


  • 3.  RE: LR SFP's not working on EX Series

    Posted 05-29-2024 13:38

    I have successfully implement both SR (short-reach for multimode fibre) and LR (long-reach for singlemode fibre) although in both instance the device had to be coded (by the SFP manufacturer or via a separate programmer) from flexoptics. It is obviously essential that you use the correct patch cord based on the type of SFP you're using and the configuration of the patch cord needs to be what is called and A-B, so that transmit at the A end connects to the receive port at the B end, and visa versa.

    If you're not sure of any of these things I'd suggest creating a couple of simple and small VLANs on you switch and connect them with the required SFPs and fibre patch cable.

    You can then use

    show chassis hardware

    and 

    show interfaces terse

    to see what is present and if it is up or down.

    Hope that helps a little.



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    JASON JAMES
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    Original Message