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154 Chapter 5
Defining Connectivity Components
Defining Link Stations
Defining Link Stations
To communicate with other nodes in an SNA network, you must
configure the characteristics of a link station (LS) to an adjacent node in
the SNA network. Before you can define a link station, you must define a
port for the adapter (and link protocol) you are using. Most of the
information needed to configure a link station is the same, whatever
protocol is being used.
A link station represents the logical path through the SNA network
between the SNAplus2 local node and a remote computer. The remote
computer can be any of the following:
• A host computer, on which SNAplus2 accesses a host program using
3270, RJE, or LUA communications (or uses APPC or CPI-C for
program-to-program communications)
• A peer computer, with SNAplus2 and the remote computer
communicating as equal partners (the typical arrangement in an
APPN network)
• A downstream computer that uses the SNAplus2 PU concentration
feature or DLUR feature in order to access a host
A link station is associated with a specific port; you can define one or
more link stations on each port.
Each link station that supports dependent traffic has an associated PU
(physical unit). Because PUs are associated with link stations, SNAplus2
does not treat them as separate resources; they are configured as part of
link station configuration, and are started and stopped as part of
starting and stopping link stations. Link stations are shown in the
connectivity section of the Node window; PUs are not shown in any
window.
NOTE In most circumstances, you need to add a link station to the port.
However, if you want to use a dynamically created link station for APPC
traffic only, for situations in which the link is always activated from the
remote node, you do not need to explicitly configure one.
If a remote node attempts to connect to the local node, but no link station
is defined that matches the address specified on the incoming call,
SNAplus2 can define one implicitly if a suitable port has been defined on