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60 Chapter 1
SNA Terms and Concepts
Basic APPN Concepts
Figure 1-10 Definitions Needed for Direct Links from Node EN1 to Every
Node in an APPN Network
If all of the nodes in the network are to support direct links to every
other node, a total of 30 link definitions are needed on the six nodes in
this example. In general, the number of link definitions can be calculated
as n × (n−1), where n is the number of nodes in the network. In a larger
network, the number of link definitions quickly becomes unwieldy.
Increasing the number of link definitions between network nodes also
increases the number of TDUs flowing through the network, which can
degrade network performance.
APPN connection networks provide a solution to this problem.
APPN Connection Networks
For APPN networks attached to a shared-access transport facility
(SATF), an APPN connection network greatly reduces the number of link
definitions needed to support direct connectivity between nodes in the
network. In a connection network, an APPN end node needs to configure