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Figure 1-7
SNA Terms and Concepts
Basic APPN Concepts
Network Node Directory
A network node locates a remote LU as follows:
1. The network node receives a request to locate an LU. The request can
be any of the following:
• The name of a destination LU sent by an end node or a LEN node
to its network node server
• An LU name specified in a LOCATE search request from an end
node
• An LU name specified in a BIND request from a LEN node
• An LU name specified by a TP on the network node
2. If the destination LU is not located in the network node—but appears
in its directory—the network node sends a directed search request to
the destination network node server to verify the location of the LU.
If the LU is not in the network node directory, the node initiates a
search of the network by sending a broadcast search to every adjacent
network node.
3. Each node in turn propagates the broadcast and returns replies
indicating success or failure.
For its future needs, a network node caches information obtained from
successful broadcast searches.
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Chapter 1
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