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Browse Prior Art Database

Problem Determination in Appn Networks

IP.com Disclosure Number: IPCOM000119213D
Original Publication Date: 1991-Jan-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 8 page(s) / 269K

Publishing Venue

IBM

Related People

Mataya, CL: AUTHOR [+2]

Abstract

Disclosed are enhancements to the AS/400* DSPAPPNINF (Display APPN Information) system command which provide the following key functions: - Ability to display only those nodes (systems) in a network which are active participants in the network (i.e., have an active communication link with one or more adjacent nodes), or, conversely, only those nodes which are NOT active in the network. - Display and formatting capability of the SNA BIND command which governs a communication session between two locations in different nodes, - Display and formatting capability of SNA Path Information Units (PIUs) for both endpoint and intermediate APPN sessions, and - An output file capability which permits AS/400 users to write their own application programs to do network problem determination and management if they so choose.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 32% of the total text.

Problem Determination in Appn Networks

      Disclosed are enhancements to the AS/400* DSPAPPNINF
(Display APPN Information) system command which provide the following
key functions:
-    Ability to display only those nodes (systems) in a network which
are active participants in the network (i.e., have an active
communication link with one or more adjacent nodes), or, conversely,
only those nodes which are NOT active in the network.
-    Display and formatting capability of the SNA BIND command which
governs a communication session between two locations in different
nodes,
-    Display and formatting capability of SNA Path Information Units
(PIUs) for both endpoint and intermediate APPN sessions, and
-    An output file capability which permits AS/400 users to write
their own application programs to do network problem determination
and management if they so choose.

      Prior to a discussion of each of the enhancements some details
need to be presented relating the interface between the command
processing programs associated with the DSPAPPNINF command and the
APPN VLIC components which provide the communication capability
between systems.  This relationship can be viewed graphically by
referring to Fig. 1.

      APPN Information retrieves most of the data it processes from
the APPN VLIC components using the Request Path Operation (REQPO) MI
instruction.  The only exception to this is some session-specific
data which is retrieved from an internal session logging table.  The
APPN data, as it resides in the APPN VLIC components, is dynamic,
i.e., it is subject to change as the network activity changes.  In
this sense, the data APPN VLIC returns to APPN Information is a
'snapshot' of the network at a given instant in time.

      APPN Information retrieves four types of information from the
APPN VLIC components, each of which can be accessed by the user with
keywords on the DSPAPPNINF command:
-    Topology data.  This consists of the set of all nodes in the
network which are known to the local node and their characteristics.
The set of link destination nodes along with the characteristics of
the connecting links for each node is also included.
-    Directory data.  This consists of the names of the locations in
the local node and the names of all remote control points for which
information exists in the local directory, along with their
locations.
-    Intermediate session data.  This consists of information about
intermediate sessions being routed through the local node.
-    Endpoint session data.  This consists of information about
sessions for which the local node is a session end point.

      For simplicity, most of the enhancements discussed here are in
terms of displayed output.  DSPAPPNINF also provides print (spool
file) and data file (outfile) output capability.

      ACTIVE VS INACTIVE NODES:  An active node is defined to be a
node that has at least one active logical co...