HP-UX SNAplus2 R7 Administration Guide

Defining Connectivity Components
Defining Link Stations
5.2 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 downstream PU concentration or 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 the local node. This dynamically created link station
appears in the connectivity section of the Node window for the duration of the connection.
To configure a link station, use one of the following methods:
Motif administration program
Select
Connectivity and
New link station
from the Services menu on the Node window.
Command-line administration program
Issue the following command:
define_type_ls
In this command, type indicates the link protocol type (sdlc, tr, ethernet, fddi, qllc, ip).
Advanced parameters for link stations provide additional control over transmission characteristics, XID exchange,
optional link facilities, and reactivation procedures.
5.2.1 Link Station Configuration Parameters
In Motif, the Link Station Configuration dialog contains the following sections, each containing different categories
of configuration parameters:
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