HP-UX SNAplus2 R7 General Information

SNA Networking
SNA and APPN
Figure 1–3 Branch Extender
EN1
Legend
EN - End Node
NN - Network Node
BrNN - Branch Network Node
EN3
EN2
EN4
NNE
BrNNF
NND
NNC
NNA
NNB
Host
APPN Network
Branch Network
Subarea Network
Controller
As the name implies, Branch Extender is designed for networks that can be divided into distinct areas such as
separate branches of a large organization. It works by separating out branches from the main backbone APPN
network (for example, the network in the organization’s headquarters).
Each branch contains a node of a new type called Branch Network Node (BrNN), which is connected to a Network
Node in the main APPN backbone network. The BrNN combines the functions of an APPN network node and an
APPN end node.
• To the backbone network, the BrNN appears as an End Node, connected to its Network Node Server (NNS) in
the backbone network:
• The nodes in the backbone network are not aware of the nodes within the branch, reducing the amount of
topology information that must be stored.
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