About Trace Results; Displaying Trace Results - Nortel 2300 Series Configuration Manual

584 Appendix A: Troubleshooting a WS Switch

About Trace Results

The trace commands use the underlying logging mechanism to deliver trace messages. Trace messages are generated
with the debug severity level. By default, the only log target that receives debug-level messages is the volatile trace
buffer. (To see the contents of the trace buffer, see
The volatile trace buffer receives messages for all log severities when any trace area is active. However, if no trace area
is active, no messages are sent to the trace buffer regardless of their severity. If you do not enable trace commands, the
trace buffer is effectively disabled.
Because traces use the logging facility, any other logging target can be used to capture trace messages if its severity is set
to debug. However, since tracing can be voluminous, Nortel discourages this in practice. To enable trace output to the
console, enter the command set log console severity debug.
If you attempt to send trace output to a Telnet session, be aware that tracing is disabled for areas processing packets that
might be associated with the Telnet session.

Displaying Trace Results

To view the output of currently running trace commands, use the following command:
show log trace [{+|-|/}number-of-messages] [facility facility-name] [matching string]
[severity severity-level]
For example, the following command displays a trace log of error-level events:
23x0# show log trace severity error
KERNEL Jan 15 23:08:10 ERROR duplicate IP address 10.7.122.102 sent from link
address 00:05:5d:45:ae:cd
To display a specific number of trace log messages, you must enter a plus sign (+), minus sign (-), or slash (/) before the
number. These characters filter the messages displayed as follows:
+number-of-messages
-number-of-messages
/number-of-messages
To filter trace output by WSS Software area, use the facility facility-name keyword. For a list of valid facilities for
which you can view event messages, type the following command:
23x0# show log trace facility ?
<facility name>
ARP,ASO, BOOT, CLI, CLUSTER, COPP, CRYPTO, DOT1X, ENCAP, ETHERNET, GATEWAY,
HTTPD, IGMP, IP, MISC, NOSE, NP, RAND, RESOLV, RIB, ROAM, ROGUE, SM, SNMPD,
SPAN, STORE, SYS, TAGMGR, TBRIDGE, TCPSSL, TELNET, TFTP, TLS, TUNNEL, VLAN,
X509, XML, AP, RAPDA, WEBVIEW, EAP, PORTCONFIG, FP.
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"Displaying Trace Results" on page
Displays the specified number of log entries, starting with the oldest in
the log.
Displays the specified number of entries, starting with the newest in
the log.
Displays the specified number of the most recent entries in the log,
starting with the least recent.
Select one of: KERNEL, AAA, SYSLOGD, ACL, APM,
584.)