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How to configure duplicate WWPN event notification on switch?

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fabric-interconnect-and-management-switches
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SAN
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Applies to

  • Brocade switch
  • SANnav

Answer

  • According to Fibre Channel standards, the Port World Wide Name (PWWN) of a device cannot overlap with that of another device, thus having duplicate PWWNs within the same fabric is not a supported configuration.
  • If a PWWN conflict occurs with two devices attached to the same domain, Fabric OS handles device login in such a way that only one device may be logged in to the fabric at a time.
  • If a PWWN conflict occurs and two duplicate devices are attached to the fabric through different domains, the devices are removed from the NS database and a RAS log is generated.
    • Note that if a device attempts to log in with the same PWWN as another device on a different switch, both devices are logged out.

 

  • We can configure how duplicate PWWNs are handled by selecting an option in the Enforce FLOGI/FDISC login prompt of the configure command:
    • Connect to the switch and log in using an account with admin permissions.
    • Enter the switchDisable command to disable the switch.
    • Enter the configure command.
    • Enter y after the F_Port login parameters prompt.
    • Enter one of the following options at the Enforce FLOGI/FDISC login prompt to select the behavior for handling duplicate PWWNs.
      • Setting 0: First login takes precedence over second login (default behavior).
      • Setting 1: Second login overrides first login.
      • Setting 2: The port type determines whether the first or second login takes precedence
    • Respond to the remaining prompts, or press  Ctrl + D to accept the other settings and exit.
    • Enter the switchEnable command to re-enable the switch.

 

  • Refer: Brocade Fabric OS Administration Guide ( Page 115 and 116)

  • RASlog messages with message id FCPH-1003 and FCPH-1004 will be logged in errdump when switch hits this duplicate wwpn behaviour.
    FCPH-1003 -> For F port
    FCPH-1004 -> For NPIV ports

  • Refer to this document for configuring Raslog messages for a particular event id-  How to configure RASlog messages
     

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