Technical data

BCSM IN A NUTSHELL 2008

Page 33 of 44

CASCADED DIRECTOR REQUIREMENTS FOR B-SERIES

Requires Secure Fabric OS License

• Includes fabric binding, switch binding, and port binding security methods that prevent

unauthorized devices from joining a fabric

Switch Connection Control (SCC) Policy in Security Set

• SCC policy is used to restrict which switches can join the fabric

Insistent Domain ID (IDID) must be set on all switches

Domain IDs need to be unique

• If both switches have IDID set and the same Domain ID, the fabrics will not merge

Dynamic Load Sharing (DLS) should be set to Off.

In-Order Delivery (IOD) should be set to On.

The DLS setting is recommended in a FICON environment. It does not allow for recomputing of routes

when an F_Port or E_Port changes status. This reduces the number of channel error messages (interface-

control checks) generated by the channel subsystem when a change of status occurs in the switch.

The IOD setting is mandatory in a FICON environment. It ensures frames are delivered in order. When

frames are not delivered in order, they will be dropped by the switch.

ENABLING CUP

• The CUP License must be installed

• FICON Management Server (FMS) Mode must be enabled

With CUP License installed and FMS Mode enabled

• CUP Port is activated: Frames w/ address ‘0xDDFE00’ are routed to the CPU (CUP port address)

and in-band CUP commands processed