Expand Configuration and Management Manual (H06.21+, J06.10+)

Expand Configuration and Management Manual — 529522-013
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20 Troubleshooting
To quickly and efficiently identify and resolve network problems, HP recommends that
you use a standard network troubleshooting methodology.
•
Understanding Your Network
•
Collecting Network Information
•
Identifying Network Problems on page 20-3
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Resolving Specific Network Problems on page 20-11
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Reporting Network Problems on page 20-29
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Resolving Common Network Problems on page 20-31
This section explains each of the elements of the troubleshooting methodology and
shows you how to use it to resolve common Expand subsystem problems.
Understanding Your Network
A good understanding of the Expand subsystem and the normal operation of your
network are the most crucial elements in problem resolution. An understanding of the
operation of your own network should be based on:
•
Knowledge of the network design and configuration of each node in the network
•
Knowledge of the design and purpose of network applications
•
Information gathered using HP utilities during routine network checks
Collecting Network Information
This subsection describes the tools and commands provided to help you become
familiar with the normal operation of your network.
EMS
The Event Management Service (EMS) is a standard Distributed Systems
Management (DSM) interface that provides event collection, logging, and distribution
facilities. EMS messages for Expand are described in the Operator Messages Manual.
SCF
The Subsystem Control Facility (SCF) interface to the Expand subsystem provides
several commands to help you determine the normal operation of Expand line-handler
processes.
The SCF STATS command displays Layer 4 and Layer 2 st
atistical information. The
SCF STATUS command displays information about the status of an object, such as its
state (STOPPED, STARTING, or STARTED).
The SCF LISTDEV command is useful for identifying system component
s and devices
including Expand line-handler processes and the network control process ($NCP). By
using the TYPE identifier in the SCF LISTDEV command, you can display specific