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Serviceability Tracing Packet Commands
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Serviceability Tracing Packet 
Commands
Debug commands cause the output of the enabled trace to display on a serial 
port or telnet console. Note that the output resulting from enabling a debug 
trace always displays on the serial port. The output resulting from enabling a 
debug trace displays on all login sessions for which any debug trace has been 
enabled. The configuration of a debug command remains in effect the whole 
login session.
The output of a debug command is always submitted to the syslog utility at a 
DEBUG severity level. As such, it can be forwarded to a syslog server, stored in 
the buffer log, or otherwise processed in accordance with the configuration of 
the syslog utility. Configuration of console logging in the syslog utility is not 
required in order to view the output of debug traces.
Debug commands are provided in the normal CLI tree. Debug settings are 
not persistent and are not visible in the running configuration. To view the 
current debug settings, use the show debug command.
The output of debug commands can be large and may adversely affect system 
performance.
Enabling debug for all IP packets can cause a serious impact on the system 
performance; therefore, it is limited by ACLs. This means debug can be 
enabled for IP packets that conform to the configured ACL. This also limits 
the feature availability to only when the QoS component is available. Debug 
for VRRP and ARP are available on routing builds.
Commands in this Chapter
This chapter explains the following commands:
2CSPC4.X8100-SWUM102.book  Page 1583  Friday, March 15, 2013  8:56 AM