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add new switch to a existing SAN with lower WWN | Principal Selection Mode is Disable.

  • 1.  add new switch to a existing SAN with lower WWN | Principal Selection Mode is Disable.

    Posted 10-14-2016 07:58 AM

    Dear expert,

     

    We are planning to add new switch to a existing SAN this evening!


    Current we have one DCX were Principal Selection Mode is Disable.
    The new switch has a lower WWN


    We want to for come the new switch will be the principle switch?

    I can use some advice here as the is a grey area!

     

    1. Do we need to enable on the new switch fabricprincipal -enable –p 0x02 –f to enable the mode and also assign to a higher priority
    2. Do we need to enable on the existing production switch fabricprincipal -enable –p 0x01 –f to enable the mode and also assign to a lowest priority
    3. or ......?

     

    Existing switch production SAN
    C4NLAMSY301:FID128:admin> fabricprincipal
    Principal Selection Mode: Disable
    Principal Switch Selection Priority: 0

    C4NLAMSY301:FID128:admin> fabricshow
    Switch ID Worldwide Name Enet IP Addr FC IP Addr Name
    -------------------------------------------------------------------------
    5: fffc05 10:00:00:05:1e:6b:2e:00 10.155.140.122 0.0.0.0 >"C4NLAMSY301"
    160: fffca0 50:00:51:e6:b2:e0:1e:0a 0.0.0.0 0.0.0.0 "fcr_fd_160"

    The Fabric has 2 switches
    Fabric Name: TSNL_AMS_H1_0

     

    New switch connected
    C4NLAMSY003:FID128:admin> fabricprincipal --show
    Principal Selection Mode: Disable
    Principal Switch Selection Priority: 0
    C4NLAMSY003:FID128:admin>

    C4NLAMSY003:FID128:admin> fabricshow
    Switch ID Worldwide Name Enet IP Addr FC IP Addr Name
    -------------------------------------------------------------------------
    1: fffc01 10:00:00:05:33:62:c1:00 10.155.140.102 0.0.0.0 >"C4NLAMSY003"
    2: fffc02 50:00:53:36:2c:2c:1f:02 0.0.0.0 0.0.0.0 "fcr_xd_2_11"
    160: fffca0 50:00:53:36:2c:10:1e:0a 0.0.0.0 0.0.0.0 "fcr_fd_160"


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  • 2.  Re: add new switch to a existing SAN with lower WWN | Principal Selection Mode is Disable.

    Posted 10-14-2016 03:09 PM

    Hi @John Kooijmans

     

    whatever is you real name.

     

    ->Current we have one DCX were Principal Selection Mode is Disable.

     

    I assume the DCX is Core Switch.

     

    now you want to add:

     

    ->The new switch has a lower WWN

     

    the primary question is, is this New Switch Core or EDGE Switch ?

     

    as per may experience - and this is just my opinion - I'm not a frieed to set whatever Core or EDGE as forced principal.

     

    but if you want to force a switch in the fabric as principal, is recommended to do this operation on Core Switch.

     

     


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  • 3.  Re: add new switch to a existing SAN with lower WWN | Principal Selection Mode is Disable.

    Posted 10-21-2016 06:24 AM

    Hi John,

     

    long time no see - I would, it all depends on how you add the your next, switch, but to ensure that the new switch is principal, i would

     

    - fabricprincipal --enable -p 01 ## on new switch

     

    to flag this switch as principal (highest priority). And after the merge, I would the, if necessary  

     

    - fabricprincipal -f ## on new switch

     

    to force a fabric build (BF) and re-election of the principal switch. You do not need change the existing switch.


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