HP-UX SNAplus2 R7 Administration Guide

SNA Terms and Concepts
Basic APPN Concepts
1.3.1 APPN Node Types
The following types of nodes can be part of an APPN network:
• Network nodes (see Figure 1–4, Portion of a Sample APPN Network)
• End nodes (see Figure 1–4, Portion of a Sample APPN Network)
In addition, low-entry networking (LEN) nodes can be connected to an APPN network, but they do not use APPN
features (see Figure 1–4, Portion of a Sample APPN Network).
A sample APPN network is shown in Figure 1–4, Portion of a Sample APPN Network.
Figure 1–4 Portion of a Sample APPN Network
EN1
LEN1
Legend
EN - End Node
NN - Network Node
LEN - Low-Entry Networking Node
EN3
NNE
EN2
NND
NNC
NNA
NNB
Host
APPN Network
Subarea Network
Controller
This example shows an APPN network that includes five network nodes (NNs), three end nodes (ENs), and a LEN
node. The network nodes form the backbone of the APPN network; end nodes access the network through the net-
work nodes. LU 6.2 TPs on any node can communicate with any other LU 6.2 TPs in the network.
One of the APPN network nodes (NNA) also participates in a subarea network, connecting to a host through a
communication controller. This node functions as an APPN node when communicating with nodes in the APPN
network, and as a peripheral node when communicating with nodes in the subarea network. Through this network
node, LU type 6.2 LUs on other nodes in the APPN network can establish LU-LU sessions with LU type 6.2 LUs
on the host.
APPN Network Nodes
An APPN network node is a type 2.1 node that provides distributed directory and routing services for all LUs in its
domain. These LUs can be located on the network node itself, or on an APPN end node or LEN node for which
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