HP-UX SNAplus2 General Information (October 1998)

Chapter 1 21

SNA Networking

SNA and APPN

Each network node includes a control point that can

establish a CP-CP session with any other adjacent

network node, and with any adjacent end node for

which the network node is the network node server.

LEN Nodes

In Figure 1-2, “Portion of a Sample APPN Network,”

the EN low entry networking (LEN) node is a type 2.1

node. It contains the most basic functionality necessary

for connection to an APPN network.

LEN nodes do not contain control points and so cannot

establish CP-CP sessions with any other node. This

means that they must be manually pre-conﬁgured with

information about the remote LUs with which they can

communicate.

A LEN node can communicate using a direct

point-to-point connection to any other node in the

APPN network. Additionally, it can communicate with

a network node that provides access to other nodes in

the network. To do this, the resources on the other

nodes must be conﬁgured on the LEN node as though

they were resources of the network node. If, in addition,

the LEN node's resources are conﬁgured on the

network node, other nodes in the network can locate

the resources on the LEN node. In this case, the

network node acts as a network node server on behalf

of the LEN node. To the LEN node, the entire APPN

network appears to be located on the network node; to

the rest of the APPN network, the LEN node appears

to be part of its network node server.