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Chapter 7 181
Configuring APPC Communication
Defining Remote Nodes
Defining Remote Nodes
You must define a remote node (and the partner LUs on the node) in the
following situations:
• If the local node is a LEN node, you must define all of the remote
nodes and any partner LUs on the remote node with which it
communicates using APPC. A LEN node is not able to dynamically
locate partner LUs; the remote node definition enables it to do so.
• If the local node is not part of an APPN network (for example, if you
have two end nodes directly connected, with no network node server),
LUs cannot be located dynamically. In this case, you must configure
each partner LU.
• If the remote node is a LEN node and the local node is a network node
that acts as the LEN node's network node server, you must define the
LEN node (and its partner LUs) as a remote node on the network
node server. This definition enables nodes in the rest of the APPN
network to locate LUs on the LEN node.
• If the remote node is in a different APPN network, you must define
the remote node because it cannot be dynamically located.
If you need to define the remote node and did not do so when you were
defined the link station, you must do so before you can use APPC
communications over the link.
When you add a remote node definition, a partner LU with the same
name as the remote node is automatically added; this is the control point
LU for the remote node. If your application uses this partner LU, you do
not need to add another partner LU, although you may want to add an
LU alias for the partner LU. To add an alias, double click on the partner
LU and enter the alias in the Partner LU Configuration dialog.
If both the local node and the remote node are end nodes or network
nodes and are part of an APPN network, partner LUs are located
dynamically when needed. In this case, do not define the remote node
where the LUs are located, because defining the node can cause the
protocols in APPN that dynamically locate LUs to malfunction.
To prevent this malfunction, SNAplus2 does not permit you to define a
remote node with which it has CP-CP sessions active (or with which it
has had CP-CP sessions in the past). Additionally, if you have previously