SNAX/XF and SNAX/APN Configuration and Management Manual

SCF Commands for SNAX/XF and SNAX/APN
SNAX/XF and SNAX/APN Configuration and Management Manual—425836-006
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TRACE Command
Considerations

The TRACE command for SNAX/XF and SNAX/APN differs from the TRACE
command documented in the SCF Reference Manual for G-series RVUs, which
provides three additional trace options for the LINE object: LUSELECT,
PUSELECT, and OFF.

If a PU or LU is configured after the trace session is started, the object will be
traced only in the following configurations:

The object is an LU and LUSELECT was not specified.

The object is a PU and PUSELECT was not specified.

The object is an LU and LUSELECT ALL was specified.

The object is a PU and PUSELECT ALL was specified.

If a new session is initiated after the trace is started, activity on the session will be
traced only if one of the following is true:

SESSIONSELECT was not specified.

SESSIONSELECT ALL was specified.
Recommended Settings for Trace Options
How you set the various trace options depends on the purpose of your trace. The
following paragraphs explain the recommended settings for each option.
BACKUP
In most cases there is no reason to trace a backup line-handler or service-manager
process. You might want to trace the backup process if you suspect a checkpointing
problem or if you need to capture a CPU switch. If the primary CPU fails, the backup
takes over and becomes the primary, and in this case it might be desirable to have
captured the trace of the takeover in the new primary process by specifying BACKUP.
COUNT
Specifying a count of records to be traced is not recommended in most cases. In
troubleshooting, you usually run a trace until an observed event occurs, and then stop
the trace manually. It is not usually known when the event may occur. If you specify a
count, the event may not occur until after the trace is stopped, in which case the event
will not be captured. If you know for certain that the event will occur before a given
number of records are traced, you can specify a count to prevent wrapping and to
eliminate the need to stop the trace manually.
LUSELECT, PUSELECT, and OFF
If you suspect a problem on a line, you should use these modifiers only after you have
determined that a specific set of objects (LUs or PUs) is problematic. When a problem