HP -UX SNAplus2 Instrukcja Użytkownika Pobierz pdf (Strona 52)

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52 Chapter 1

SNA Terms and Concepts

Basic APPN Concepts

Figure 1-7 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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