Operating instructions

222 Cisco Systems Intelligent Gigabit Ethernet Switch Module
debug
A vast number of debug commands are available with IOS that are used to monitor various
activities within the IGESM.
To see current debugs use show debug.
To stop debugs, use the
no form of the command; for example: no debug arp.
To stop all running debug commands with a single command, use u all (short for undebug
all). Always run u all when you are finished troubleshooting.
If Telneted in, run term monitor to see messages.
Example of some common debugs:
򐂰 debug arp
Monitors ARP request to and from management interface of the IGESM.
򐂰 debug ip packet
Monitors IP traffic to and from the IGESM (
not through the IGESM).
򐂰 debug cdp packets
Monitors CDP packets between IGESM and other devices.
򐂰 debug ip icmp
Monitors ping traffic to and from the IGESM (
not through the IGESM).
Warning: Use debug commands with extreme care.
Debug is recommended for use only by experienced administrators. Incorrect use can lead
to unexpected and undesired operation of the IGESM, and can disrupt the flow of traffic to
and through the switch, which can result in a network down condition. Do not use unless
you understand its consequences.
Do not use debug all.
Although you can have multiple debugs running at the same time, it is possible to
overwhelm the CPU of the switch with too many debugs.