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Static definition of cross-domain resources z/OS Communications Server: SNA Network Implementation Guide SC27-3672-01 |
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Cross-domain resources are logical units (application programs, peripheral nodes, and terminals) that are controlled by another VTAM® domain. You define cross-domain resources in one or more cross-domain resource major nodes. Each cross-domain resource represents a minor node. You can also define model cross-domain resources in one or more cross-domain resource major nodes. Each model cross-domain resource represents a potential group of similarly named cross-domain resource minor nodes. See Model definition of cross-domain resources for more information. You define a cross-domain resource major node with one VBUILD definition statement for the major node, one CDRSC definition statement for each cross-domain resource in the major node, and one CDRSC definition statement for each model cross-domain resource in the major node. The same set of CDRSC definition statements can be used throughout the network. The name on the CDRSC definition statement represents the name for the resource that is controlled by another VTAM. The CDRM operand, if used, specifies the name of the VTAM that controls that resource. If you do not specify the CDRM operand, the name of the other VTAM that controls the resource is not known. Therefore, you need to use an adjacent SSCP table, so that your VTAM can locate the CDRSC in another VTAM domain. An adjacent SSCP table is a list of other VTAMs with which your VTAM can have an SSCP-SSCP session. This list of VTAMs is used to search your network for the CDRSC. For more information about adjacent SSCP tables, see Adjacent SSCPs. To statically define two or more CDRSCs that have the same name but are in different networks, use the NQNMODE=NQNAME start option to allow network-qualified names. For more information, see the z/OS Communications Server: SNA Resource Definition Reference. In the following example of a CDRSC major node, some of the CDRSC
definition statements do not specify a CDRM operand, so an adjacent
SSCP table is required. However, some of the other cross-domain resource
definition statements identify the CDRM owner.
Note: Information about coding the CDRSC definition
statement for TSO/VTAM is in Multiple-domain network.
A dependent logical unit and a CDRSC with the same network-qualified
name can coexist. In a backup and recovery situation where one host
is assuming ownership of a logical unit from another host in the same
network, the dependent logical unit can be activated by the new host
even though an application program within it currently has a cross-domain
session with the logical unit. If the physical and logical units being
recovered support ACTPU(ERP) and ACTLU(ERP) requests, the sessions
with the logical units are not affected when the physical units and
logical units are activated. The CDRSC definition automatically becomes
a shadow resource, and the logical unit is now defined as a same-domain (APPL or
LU) resource. If the current host wants to relinquish ownership of
the logical unit, it releases or deactivates the logical unit and
its associated physical unit. VTAM then makes the logical unit a shadow resource, and the CDRSC again
becomes the active definition.
Note: For MNPS applications that are
active on a network node, you cannot activate a CDRSC definition with
the same name. You can activate the CDRSC before the MNPS application
issuing OPEN ACB, and the CDRSC will become a shadow resource at that
time.
When you define your network resources for XRF, consider the following
situations:
Regardless of whether you are using USERVARs with XRF, the names of your USERVARs must be unique. To ensure proper session setup with the desired partner, there can be no other resource within the network that has the same name as any of your USERVARs (except when the USERVAR is identical to its value). |
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