> # FICON VSAN Prerequisites

> To ensure that a FICON VSAN is operationally up, be sure to verify the following requirements:

> - Set the default zone to permit, if you are not using the zoning feature. See the "About the Default Zone" topic.
> - Enable in-order delivery on the VSAN. See "Configuring Fibre Channel Routing Services and Protocols."
> - Enable (and if required, configure) fabric binding on the VSAN. See the "Calculating FICON Flow Load Balance" topic. For more information about Fabric Binding, refer to the Cisco MDS 9000 Family NX-OS Security Configuration Guide.
> - Verify that conflicting persistent FC IDs do not exist in the switch. For information about configuring domain parameters, refer to the Cisco MDS 9000 Family NX-OS System Management Configuration Guide.
> - Verify that the configured domain ID and requested domain ID match. For information about configuring domain parameters, refer to the Cisco MDS 9000 Family NX-OS System Management Configuration Guide.
> - Add the CUP (area FE) to the zone, if you are using zoning. See the "CUP In-Band Management" topic.

> If any of these requirements are not met, the FICON feature cannot be enabled.

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