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LAG Multiple switch stacks into a single LAG

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  • 1.  LAG Multiple switch stacks into a single LAG

    Posted 05-25-2015 07:54

    We currently have construction on our campus and the crews accidentaly damaged our fiber lines to the buildings on the other side of the construction.  I have a pair of EX4500s as our core connected to the outlying switches with a LAG.  I have dark fiber available using another route and I would like to put an EX4300 switch in to create an alternate route to the existing EX4200 switches using another connection to the existing LAG.  I need the other switches to remain connected when they replace the damaged fiber.  Can I add a connection from the new switch to the existing LAG on the outlying switch even though the LAG is from a different source other than the EX4500 core switch?


    #LAG
    #ex4200
    #ex4500
    #EX4300


  • 2.  RE: LAG Multiple switch stacks into a single LAG
    Best Answer

     
    Posted 05-25-2015 23:24

    No, this is not possible. If you are using normal LAG(not MC-LAG), then the source and destination of the LAG must be the same devices(standalone or VC).

     

    I might not got this right, but I understand that you have the option to create a ring with the EX4500VC, EX4200 and EX4300.

     

    Why don't you go ahead with this design during MW?


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  • 3.  RE: LAG Multiple switch stacks into a single LAG

    Posted 05-26-2015 06:25

    First off, thanks for the answer.  At least it's something.  I would persue that avenue but I don't have any experience with MC-LAG configurations and I'm having trouble finding documentation referencing same that makes sense.



  • 4.  RE: LAG Multiple switch stacks into a single LAG

     
    Posted 05-26-2015 06:29

    EX4200/EX4500 doesn't support MC-LAG. EX4300 supports it.

     

    However, you would need two devices that support MC-LAG to use the feature.

     

    So, in your case, this would not be applicable and you are left with the option of creating a ring between EX4200 - EX4500 - EX4300.

     



    =====

    If this worked for you please flag my post as an "Accepted Solution" so others can benefit. A kudo would be cool if you think I earned it.