Configuring and Managing Host-Based X.25 Links - Edition 6 (36939-90057)

Introduction
Maintenance
Chapter 1
35
Level 3 Trace
If you choose trace option 3, level 3 trace, you will be prompted for a VC type. Possible
responses are PAd, to trace only PAD VCs, SYs, to trace system-to-system VCs, or All, to
trace both PAD and system-to-system VCs that are active through the designated DTC
and card. You will also need to specify the link name of the X.25 link. You will then be
prompted for the filter (trace headers only or full packets) and given the option of
specifying a file name.
For a complete description of TermDSM and its use with all DTC connection card
options, see Troubleshooting Terminal, Printer, and Serial Device Connections manual.
Trace Formatting
The trace file can be formatted with the NMDUMP utility. Enter option 2 at the prompt
“Would you like to format a log or trace file” then select subsystem ID 60 for DTC/X.25
Link. For more information, refer to Using the Node Management Services (NMS)
Utilities manual.
Logging
Logging for host-based X.25 links is enabled and disabled in the NMMGR configuration
file, as is the case for other link products. However, host-based X.25 log files are
formatted through a tool called EVLOG (you cannot use the NMDUMP formatter for
host-based log files). See Chapter 8, “Formatting Host-Based X.25 Log Files,” for
instructions on using the EVLOG formatter.
Event Log Files
Events are logged to two alternating log files for each DTC. When you bring the DTC up,
it immediately begins logging to the first log file. The DTC records events to that file
until too few bytes are available for the next log record entry. At this point, the DTC
begins recording to the second log file. Alternating log files in this manner assures that
at least five hundred records are always available for formatting and evaluation.
Log File Name Format
The format of the log file names is as follows:
HnnnnnnA.PUB.SYS
(first log
file)
HnnnnnnB.PUB.SYS
(second log
file)
All the host-based X.25 log files begin with the letter H. The second through the seventh
digits correspond to the last six digits of the DTC address. The A or B as the last
character of the file name indicates whether it is the first or the second file.
Each file stores up to 500 records, with each record or packet having a length of
132 bytes.
If you select the file that is currently receiving the events from the DTC, the EVLOG
formatter can format and display the events from the DTC as they are logged (Dynamic
logging display).