Getting Started with the IBM 2109 M12 FICON Director

Chapter 3. Pre-installation planning 33

Figure 3-6 Mark ISL ports as occupied in HCD

3.5 Binding and insistent domain ID

Insistent domain IDs prohibit the use of dynamic domain IDs to ensure that predictable

domain IDs are enforced within the fabric. For example, if a switch has this feature enabled,

and a new switch is connected to it (through an ISL) without the domain ID feature enabled,

the new switch is segmented into a separate fabric and user data will not flow.

Binding is a method used in the switch to prevent devices or other switches, or both, from

attaching to the switch based on WWNs. The IBM 2109 M12 FICON Director supports three

different levels of binding.

Port and switch binding

Port binding limits the N_Port that can be attached to an F_Port on the FICON Director by

WWN. Because an N_Port is mapped directly to an F_Port within the FICON Director, there

are some flexibility limitations with port binding. For example, port swapping within a FICON

Director (switch) requires modifying a policy list.

Switch binding limits the nodes that can be attached to a FICON Director by WWN. This type

of binding allows for flexibility, because an N_Port is not bound to an F_Port; therefore, port

swapping can be done without changes to a policy list. However, moving a device from one

FICON Director (switch) to another requires changes to a policy list to include the other

switch.

Port and switch binding require a Device Connection Controls (DCC) policy list that contains

the WWNs of switches or devices that can attach to the FICON Director (switch). Device ports

must be specified by port WWN, and switch ports can be identified either by the switch WWN,

domain ID, or switch name followed by the port number or numbers.

By default, all device ports are allowed to connect to all switch ports; no DCC policies exist

until they are created by the administrator.

Each device port can be bound to one or more switch ports, and the same device ports and

switch ports can be listed in multiple DCC policies. After a switch port is specified in a DCC

Port List Row 1 of 256

Command ===> ____________________________________________ Scroll ===> CSR

Select one or more ports, then press Enter.

Switch ID . . . . : 61 Address : 61

---------------Connection---------------

/ Port H Name + Unit ID Unit Type O

_ 00 N ________________________ _

_ 01 N ________________________ _

_ 02 N ________________________ _

_ 03 N ________________________ _

_ 04 Y ISL sw 61 to sw 62

Y

_ 05 Y ________________________ N

_ 06 Y ________________________ N

_ 07 Y ________________________ N

_ 08 Y ________________________ N

_ 09 Y ________________________ N

_ 0A Y ________________________ N

F1=Help F2=Split F3=Exit F4=Prompt F5=Reset F7=Backward

F8=Forward F9=Swa

p

F10=Actions F12=Cancel F13=Instruct F22=Command

HCD Switch Port List

Port = the 1-byte port address on the switch

Name = recommended to enter the ports in

the name field

Occupied = recommended to be specified

a Y for ISL ports