HP-UX SNAplus2 R7 Administration Guide

SNA Terms and Concepts

Basic APPN Concepts

Figure 1–6 End Node Directory

LU1

Node EN3

Node LEN1

Node EN3 Directory:

LU1 - Node EN3

LUX - Node LEN1

Node EN2

Node EN1

Node NNA

LU4

LUX

LU3

LU2

LUA

Potential partner LUs in the APPN network do not need to be deﬁned to the end node. However, in order for Node

EN3 to establish a session with LUX on Node LEN1, the LU on the LEN node must be conﬁgured as a partner

LU on Node EN3.

Network Node Directories

A network node provides distributed directory services to the end nodes it serves.

An example of a network node directory is shown in Figure 1–7, Network Node Directory.

Figure 1–7 Network Node Directory

Node LEN

Node NNA Directory:

LUA - Node NNA

LUX - Node LEN

LU1 - Node EN1

LU2 - Node EN1

LU3 - Node EN2

Node EN2

Node EN1

Node NNA

LU3

LU1

LUX

LUA

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