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 have
an indirect connection through another node instead of a direct
connection to the host. Without a direct connection, 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. DLUR can be configured on an APPN node
(such as a node running SNAplus2). It 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 defined, and DLUS must be available on the
host node, but you do not have to enable DLUR on any intermediate
nodes in the session route.
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To configure DLUR support on the local node, you must perform
the following configuration tasks:
Define the local
node as described in “Configuring the Node”.
Configure connectivity to the
APPN network. APPN connectivity requires at least a port and link
station for independent traffic between the local node and the adjacent
APPN network node, as described in Chapter 5 “Defining Connectivity Components”
Define a DLUR PU on the local
node as described in “Defining DLUR PUs”.
(The DLUR PU supports connectivity to the host.)
To configure DLUR to support
LUs on the local node, you must add the LUs on the local node, as
described in Chapter 8 “Configuring User Applications”.
The LUs can be configured to support 3270 display, 3270 printer,
RJE, or LUA. Depending on the requirements of the user applications
supported by the LUs, you may also need to perform further configuration.
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