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<title>Solve communication problems using DSPAPPNINF</title>
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<h3 id="rzahjprb-comdspappninsts">Solve communication problems using DSPAPPNINF</h3>
<p>Isolating a routing problem in an Advanced Peer-to-Peer
Networking&reg; (APPN) network can be challenging. You can view the APPN information
to assist you in understanding the topology of network nodes and some of their
locations.</p>
<p>To display APPN Information, type the command DSPAPPNINF on a command line
and press F4. You can also select option 6 (Display APPN information) on the
Network Management menu.</p>
<p>The information the system displays, prints, or stores depends on the options
you select. The system displays additional options that are based on previous
options that are selected.</p>
<p>See the following scenario for help in using the DSPAPPNINF command:</p>
<p></p>
<ul>
<li>Type DSPAPPNINF *TOPOLOGY on System A.
<ul>
<li>Type 5 next to System A to display the Display Link Destination Nodes
display.
<p>The Display Link Destination Nodes display identifies how this
node's topology database looks. The link Active Column identifies whether
APPN will consider the link in route computation. If a link Active column
value is No, this indicates the link will not be included in APPN route selection.</p></li>
<li>Next type a 5 to Display Link Characteristics. This information along
with the information from the Display Network Attributes (DSPNETA) command
identifies the transmission group (TG) values and node values.
<p>With this
information, you can determine why a path is taken or why one is not being
taken for the class of service (COS).</p></li></ul></li>
<li>If you type, DSPAPPNINF *LCLNODE on System A,
<p>This allows you to determine
what locations are known by the local node. It shows locations that are configured
on the local node and locations that are found by previous searches.</p></li>
<li>If you type, DSPAPPNINF *SSN on System A,
<p>This allows you to look at
up to 200 endpoint sessions that were successfully established since the last
IPL. You can also see the route that was taken by that session, error data,
session start BIND, end time, pacing that is used, and others.</p></li>
<li>If you type, DSPAPPNINF *SSN SSNTYPE(*INMSSN) on System A,
<p>This allows
you to determine whether active sessions are routed through the local system.
You may, for example, want to vary off a controller, but need to know whether
it is being used for intermediate sessions. You can also see which controller
descriptions are associated with an intermediate sessions.</p></li></ul>
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