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

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