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  • 1.  EX-4200 VC stack with DWDM SFP+ fiber

    Posted 12-28-2012 12:35

    We need to form a Virtual-Chassis between our 2 datacenter. We have 2 Dark-Fibers, but it's using DWDM multiplexer.


    How can I form a VC running over that DWDM with 10gig links ?


    It dosent look like Juniper is selling SFP+ for DWDM. Can we use third party SFP+, will this work ?

  • 2.  RE: EX-4200 VC stack with DWDM SFP+ fiber

    Posted 01-02-2013 05:09

    You don't need DWDM modules between the DWDM Mux and the end device, the WDM is only between 2 Mux

    There should be "customer" card slots on the Mux where you need a 10g capable card. You can then either use DAC or SFP+ and fiber optics cables to attach your switch

  • 3.  RE: EX-4200 VC stack with DWDM SFP+ fiber

    Posted 01-03-2013 07:11

    I'm pretty sure we need dedicated SFP+ for each DWDM wavelenght !?


    We are planning to buy the DWDM MUX from Cisco and even them are selling dedicated SFP+ for each wavelenght.


    Here is the info from the Cisco product we want to buy:




    According to this document we cannot use DWDM for stacking EX-4200 switch over the fiber link because Juniper is not selling a per wavelenght SFP+ or XFP.


    I think I have found another plan to do it. I have found a company that are selling Fiber-To-Fiber converter. So we could use standard SR XFP on the Juniper side, but then transfer them into a dedicated Cisco DWDM wavelenght. It's supposed to be protocol-less but I'm afraid the stacking protocol on the EX-4200 would not work with such a set-up.


    Here is the link for that product:



    Here is how we could do it:


    Virtual Data-Center.jpg



    The thing is I really dont know if this is going to work. I would really prefer go direct from the EX switch to the Cisco DWDM MUX.


    Any help would be really appreciated !

  • 4.  RE: EX-4200 VC stack with DWDM SFP+ fiber

    Posted 01-03-2013 11:19

    Hi Nicolas,


    Are you going to be using the Cisco ONS platform for this wdm connectivity? There is a tunable xfp module you can purchase, model number is EX-XFP-10GE80KDWDM, and it is supported in an EX4200 with the 2x 10G XFP module. I think this is probably what your looking for. We don't have anything other then 80K optics though at this point.




  • 5.  RE: EX-4200 VC stack with DWDM SFP+ fiber
    Best Answer

    Posted 01-11-2013 04:28

    We use EX4200s to form a geographically diverse VC; third-party coloured XFPs feed into

    the channel/wavelength ports on our DWDM Mux/Demux boxes. Works quite well for us.






  • 6.  RE: EX-4200 VC stack with DWDM SFP+ fiber

    Posted 03-22-2017 07:58
    hi guys,

    I have problem with my virtual chassis on mx series, vc port not synch to peering device through dwdm. Any advise ?


  • 7.  RE: EX-4200 VC stack with DWDM SFP+ fiber

    Posted 03-24-2017 03:06

    As with most optical link problems follow the light and measure from both ends.


    Verify the SFP module installed in the port - adjust the fpc and pic slot numbers to your interface

    verify the optics on both sides are as expected for distence and wavelength

    show chassis pic fpc-slot 0 pic-slot 0 


    Confirm the send and receive power on the optic in the MX - look at your interface

    show diagnostic optics xe-0/0/0


    go to the next device and verify the light recieved is with acceptable loss for the distance from the transmit value above at each stage on the way


    when you find a suspect link with too much loss, shoot the fiber to find the flaws.