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ISL's between 8510 and existing DCX switches

  • 1.  ISL's between 8510 and existing DCX switches

    Posted 06-22-2015 07:30 AM

    Hello Team,


    We have an existing infrastructure of DCX switches 4 in number and are planning on ISLing them into the newly brought 8510's while taking advantage of VF's-We may have to create BS and VF's to use XISL's(just my thought).


    Since the old DCX fabric already has its own zoning DB and we want to import it into the new switches(with VF's) immediatly after ISLing,should we use XISL with BS or dedicated withing a VF?


    Thanks in advance..


  • 2.  Re: ISL's between 8510 and existing DCX switches

    Posted 06-26-2015 11:10 AM

  • 3.  Re: ISL's between 8510 and existing DCX switches

    Posted 06-27-2015 08:20 PM

    Hello tech51



    A storage administrator can then connect Logical Switches through various types of ISLs to create one or more Logical Fabrics.


    There are three ways to connect Logical Switches: a traditional ISL, IFL (EX_Port used by FCR), and Extended ISL (XISL). An ISL can only be used for normal L2 traffic between the connected Logical Switches, carrying only data traffic within the Logical Fabric of which the ISL is a member. One advantage of Virtual Fabrics is that Logical Switches can share a common physical connection, and each LS does not require a dedicated ISL.




    If your ED-DCX-B switch is not VF enabled and you intend to connect to a logical switch on your new ED-DCX-8510.


    Standard ISLs can also used to connect a physical switch to a Logical Switch. In this situation, during the negotiation of the E-Port capabilities, the physical switch cannot share its FID, as it doesn’t have one, and thus the standard ISL is formed. The physical switch becomes part of the Logical Fabric to which it is connected, but continues to behave as a physical switch and believes the Logical Switches are also physical switches.



    If your ED-DCX-B & ED-DCX-8510 are VF enabled



    In order for multiple Logical Switches, in multiple Logical Fabrics, to share an ISL, Virtual Fabrics supports an XISL connection, which is a physical connection between two base switches. Base switches are a special type of Logical Switch that are specifically intended for intra- and inter-fabric communication. As mentioned, base switches are connected via XISLs and form the base fabric.


    Once a base fabric is formed, the Virtual Fabric determines all of the Logical Switches (with the same FID) and Logical Fabrics that are physically associated via the base fabric, as well as the possible routes between them. For each local Logical Switch, a Logical ISL (LISL) is created for every destination Logical Switch in the same Virtual Fabric that is reachable via the base fabric. Thus, an XISL comprises the physical link between base switches and all of the virtual connections associated with that link. In addition to XISL support, the base fabric also supports IFLs via EX_Port connections for communication between Virtual Fabrics. Base switches also interoperate with FC router switches, either in the base fabric or in separate backbone fabrics.