HP-UX SNAplus2 R7 Administration Guide

Defining Connectivity Components
Defining DLUR PUs
The link station is to a downstream node that will communicate with a host using the DLUR capabilities
of the local node. (To the host, the LUs on the downstream node appear to reside on the local node.)
Such links can be used only if the local node is an APPN network node.
Downstream PU name
The PU name associated with the downstream node. This value must match the PU name that is configured
for the downstream node on the host computer. If you do not know the value to use for this name, consult
your SNA network planner.
This field applies only if you specified that this link station is to a downstream PU that will communicate
with a host using the DLUR capabilities of the local node. You can indicate this by specifying
Downstream
(DLUR) for the Remote node role field.
For more information, see Section 5.3, Defining DLUR PUs.
Upstream DLUS name
The fully qualified LU name of the host LU that supports DLUS (the LU server that the downstream PU is
to access). If you do not know the value to use for this name, consult your SNA network planner.
This field applies only if you specified that this link station is to a downstream PU that will communicate
with a host using the DLUR capabilities of the local node. You can indicate this by specifying
Downstream
(DLUR) for the Remote node role field.
5.2.2 Additional Configuration
After performing the link station configuration, continue with the following configuration tasks:
• To define a DLUR PU, see Section 5.3, Defining DLUR PUs.
• To configure passthrough services, see Chapter 9, Configuring Passthrough Services.
• To support specific user applications, see Chapter 8, Configuring User Applications.
• To support APPC communication, see Chapter 7, Configuring APPC Communication.
5.3 Defining DLUR PUs
Normally, a dependent LU session requires a direct communications link to the host computer. If many nodes
(including a host node) are connected together in an APPN network, some of them may not have a direct connection
to the host, but only an indirect connection through another node. It is not possible to establish dependent LU
sessions to the host from LUs in these indirectly connected nodes.
Dependent LU requester (DLUR) is an APPN feature designed to overcome this limitation.
This section explains how to configure a DLUR PU that provides connectivity to a host computer. Configuring a
DLUR PU enables the local node to provide DLUR services.
DLUR on an APPN node (such as a node running SNAplus2) works in conjunction with dependent LU server
(DLUS) at the host, to route sessions from dependent LUs on the DLUR node across the APPN network to the
DLUS host. The route to the host can span multiple nodes and can take advantage of APPN’s network management,
dynamic resource location, and route calculation facilities. DLUR must be available on the node where the LUs
are located, and DLUS must be available on the host node, but DLUR is not required on any intermediate nodes in
the session route.
If the SNAplus2 DLUR node is a network node, it can also provide passthrough DLUR facilities for dependent LUs
on downstream computers connected to the SNAplus2 node. These LUs can use DLUR on the SNAplus2 node to
access the host across the network, in the same way as for LUs internal to the node.
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