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ISL between Switches with different FOS

  • 1.  ISL between Switches with different FOS

    Posted 04-19-2018 02:31 PM

    Hello Everyone,

    EXTREMELY new Brocade FC guy here, so please bear with me.


    I have a new 6505 that I want to ISL an existing IBM/Brocade 5470 switch which is in an IBM BladeChassis. It appears that the newest FOS that I can run on the 5470 is 6.4.3 while the 6505's are running 8.0.1 right now. 


    After looking at the documentation, I THINK it states that the 8.1.0 FOS supports connection to the 5470 if the 5470 is running FOS 7.3.1 or later. Is that correct?


    See page 45 in this link: 




  • 2.  Re: ISL between Switches with different FOS

    Posted 04-19-2018 04:16 PM
    1) 5470 is able to run FOS 7.x, so you'd better upgrade to whatever is supported as latest version for your particular module.
    2) You are right that FOS 8.x is not compatible with FOS 6.x in the same fabric, unless you convert the blade chassis switch into the Access Gateway mode. Then it might be possible to keep it at some older FOS release. But I see no reason for that, even if you want to make it AG, you should update its FOS as mentioned in p.1)