Isolating a routing problem in an Advanced Peer-to-Peer Networking® (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.
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.
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.
See the following scenario for help in using the DSPAPPNINF command:
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.
With this information, you can determine why a path is taken or why one is not being taken for the class of service (COS).
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.
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.
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.