NonStop NS-Series Operations Guide (H06.12+)

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Tracing a Communications Line
Use the SCF TRACE command to trace the operation of a communications line. The line continues
normal operation while being traced, but it passes all its message traffic to a trace procedure.
Tracing enables you to see the history of a communications line, including its internal processing.
You can display trace files by using the commands available in the PTrace program. For
information about PTrace, refer to the PTrace Reference Manual. For information about configuring
a trace by using the SCF TRACE command, refer to the configuration and management manual
for the communications subsystem you want to trace.
Recovery Operations for Communications Subsystems
Some general troubleshooting guidelines are:
• Examine the contents of the event message log for the subsystem. For example, the WAN
subsystem or Kernel subsystem might have issued an event message that provides
information about the process failure. Event messages returned by the WAN subsystem and
SWAN concentrator are described in the WANMGR and TRAPMUX sections of the Operator
Messages Manual, respectively.
• HP provides a comprehensive library of troubleshooting guides for the communications
subsystems. Attempt to analyze the problems and restart the process or object using the
commands described in the appropriate manual listed in “Related Reading” (page 87). If
you are unable to start a required process or object, contact your service provider.
Related Reading
For more information about monitoring and performing recovery operations for communications
subsystems, see the manuals listed in Table 6-1 (page 87). The appropriate manual to use depends
on how your system is configured.
For example, if a process is configured using the SCF interface to the WAN subsystem and then
reconfigured with the SCF interface to another subsystem, only the SCF interface to the other
subsystem would provide current information about the configuration. The SCF interface to the
WAN subsystem would provide only information about the configuration before it changed.
Table 6-1 Related Reading for Communications Lines and Devices
Refer to...For Information About...
Introduction to Networking for HP NonStop NS-Series ServersGeneral information about communications subsystems
SCF Reference Manual for the Kernel SubsystemUsing SCF to monitor generic processes
LAN Configuration and Management ManualUsing SCF to monitor the SLSA subsystem as well as
Ethernet addressable devices, such as ServerNet adapters
Recovery Operations for Communications Subsystems 87