Operating instructions

Chapter 8. Cisco Systems IGESM troubleshooting 211
could be part of more than one group. These commands are discussed in more detail in 8.6,
“Useful IOS CLI troubleshooting commands” on page 212.
򐂰 Gathering data
– show running
– show vlan
– show version
– show tech-support
– show platform summary
– show logging
򐂰 Administrative
– term mon
– clear counters
– clear log
– clear arp
– clear mac add
– no logging console (config mode)
򐂰 Troubleshooting
– ping
– show cdp neighbor
– show int status
– show ip int brief
– shut - no shut (interface config mode)
– show int g0/X
– show int trunk
– show etherchannel summary
– show spanning-tree blockedports
– show spanning-tree root
– show link state group detail
– show arp
– SPAN and RSPAN
– debug (use with caution)
Figure 8-3 lists some of the modes of operation for IOS CLI.
Figure 8-3 Partial list of CLI modes of operation
POST failure or corrupt IOS
Enter vlan database from
privilege mode
Enter vlan X from global config
mode (where X = VLAN ID
number)
Enter interface g0/Y from global
config mode (where Y is the port
number to be configured)
Enter config terminal from
privilege mode
Enter Enable from User mode
Telnet or service port
How to get to
Switch(vlan)#Old way to configure VLAN
Recommended to use new
way to create VLANs
VLAN database
Switch(config-vlan)#New way to configure VLAN
This is the recommended
way to create VLANs
VLAN configuration
Switch(config-if)#Set up interface specific
config
Interface configuration
Switch:Set boot environmentBootloader (ROMMON)
Switch(config)#Make global changes or the
change has system-wide
impact
Global configuration
Switch#Super user powerPrivilege (Enable)
Switch>Limited privilegeUser
PromptFunctionsMode
POST failure or corrupt IOS
Enter vlan database from
privilege mode
Enter vlan X from global config
mode (where X = VLAN ID
number)
Enter interface g0/Y from global
config mode (where Y is the port
number to be configured)
Enter config terminal from
privilege mode
Enter Enable from User mode
Telnet or service port
How to get to
Switch(vlan)#Old way to configure VLAN
Recommended to use new
way to create VLANs
VLAN database
Switch(config-vlan)#New way to configure VLAN
This is the recommended
way to create VLANs
VLAN configuration
Switch(config-if)#Set up interface specific
config
Interface configuration
Switch:Set boot environmentBootloader (ROMMON)
Switch(config)#Make global changes or the
change has system-wide
impact
Global configuration
Switch#Super user powerPrivilege (Enable)
Switch>Limited privilegeUser
PromptFunctionsMode