HP XP20000/XP24000 HP StorageWorks XP Disk Array Mainframe Host Attachment and - Page 23

Required high-integrity features, Fabric binding, Insistent Domain IDs

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Figure 11 Example of ports in a cascaded FICON topology . Required high-integrity features FICON directors in a cascaded configuration (see Figure 12) require switches that support the following high-integrity features: • Fabric binding: This feature lets an administrator control the switch composition of a fabric by re- gistering WWNs in a membership list and explicitly defining which switches are capable of forming a fabric. In this way, an operator can deny non-authorized switches access into a fabric. A non-authorized switch attempting to gain entry into a fabric becomes isolated and is prevented from accessing fabric resources • Insistent Domain IDs: This feature prohibits the use of dynamic Domain IDs to ensure that predictable Domain IDs are being enforced within the fabric. For example, if a switch has this feature enabled and a new switch is connected to it via an inter-switch link (ISL) without the preferred Domain ID, the new switch is segmented into a separate fabric and user data will not flow. The Insistent Domain IDs feature also ensures that duplicate Domain IDs are not being used within a fabric. The channel checks whether these high-integrity features are enabled in the switch by issuing a Query Security Attributes (QSA) command during initialization. If these features are not enabled in switch, Channel initialization process stops. Figure 12 Required high-integrity features for cascaded topologies . XP Disk Array Mainframe Host Attachment and Operations Guide 23

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Figure 11 Example of ports in a cascaded FICON topology
.
Required high-integrity features
FICON directors in a cascaded configuration (see
Figure 12
) require switches that support the following
high-integrity features:
•
Fabric binding:
This feature lets an administrator control the switch composition of a fabric by re-
gistering WWNs in a membership list and explicitly defining which switches are capable of
forming a fabric. In this way, an operator can deny non-authorized switches access into a fabric.
A non-authorized switch attempting to gain entry into a fabric becomes isolated and is prevented
from accessing fabric resources
•
Insistent Domain IDs:
This feature prohibits the use of dynamic Domain IDs to ensure that predictable
Domain IDs are being enforced within the fabric. For example, if a switch has this feature enabled
and a new switch is connected to it via an inter-switch link (ISL) without the preferred Domain ID,
the new switch is segmented into a separate fabric and user data will not flow. The Insistent Domain
IDs feature also ensures that duplicate Domain IDs are not being used within a fabric.
The channel checks whether these high-integrity features are enabled in the switch by issuing a Query
Security Attributes (QSA) command during initialization. If these features are not enabled in switch,
Channel initialization process stops.
Figure 12 Required high-integrity features for cascaded topologies
.
XP Disk Array Mainframe Host Attachment and Operations Guide
23