302 Fabric OS Administrator’s Guide
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McDATA Open Fabric mode configuration restrictions
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•Platform management functions must be deactivated before connecting a Fabric OS switch to
an M-EOS switch because M-EOS switches do not understand Brocade proprietary frames
used to exchange platform information.
•In the default domain ID mode, the domain IDs of all switches in the fabric must fall within the
decimal range of 1-31 or 97-127 range.
•Older McDATA switches that use domain IDs in the decimal range 97-127 cannot be in the
same fabric as switches using the domain ID offset mode. These older switches are allowed
only with the default domain ID offset mode.
NOTE
To convert decimal numbers to hexadecimal format, refer to Appendix E, “Hexadecimal”

McDATA Open Fabric mode configuration restrictions

The following restrictions apply to McDATA Open fabric mode (interopmode 3) configurations:
•A maximum of 2048 devices can be logged in to the fabric.
•A maximum of 31 switches domain IDs can be defined.
•Domain IDs must be in the 97-127 value range on Fabric OS switches for successful
connections to M-EOS switches. M-EOS must be set with the default domain offset 96. M-EOS
switches see the domains as 1-31; devices see the domains as 97-127.
•Domain,index zoning, or default zoning, or Safezoning, are not supported.
•McDATA SANtegrity feature is not supported for FICON.
•Zone activations and zoning management are not supported except when using DFCM 10.3 or
later. Using DCFM 10.3 or later a zone can be activated and deactivated as long as there is an
EOSc switch in the fabric.
•The Defined Database is not supported in McDATA Open Fabric mode because zone sets
cannot be managed from Fabric OS switches in this mode.
•Brocade proprietary features are not supported.
•Platform management functions must be deactivated before connecting a Fabric OS switch to
an M-EOS switch because M-EOS switches do not understand Brocade proprietary frames
used to exchange platform information.
•The 239 Domain_ID mode is supported only on the Mi10K switch. None of the EOSc switches
support this mode.

Interoperability support for logical switches

Interoperability for logical switches is supported on the Brocade 5100, 5300, and VA-40FC
switches, and the Brocade DCX and DCX-4S platforms. You can configure logical switches
individually to operate in any of the interoperable modes. This means that McDATA Fabric mode,
McDATA Open Fabric mode, and Brocade Native mode are supported in the same chassis. Although
there is always at least one logical switch instance per chassis, multiple logical switch instances
can exist in a chassis.