Cisco IOS

1
Cisco IOS

• Some basics and applications for the Aironet 1200
  AP

2
Online help

• From virtually anywhere in the CLI, a question
  mark will provide assistance
• You only have to type in enough of a command to
  be unambiguous, and tab completion will fill in
  the rest
• You are encouraged to learn the full commands
  first
• Invalid commands will have invalid input
  locations marked in the error message
• A command buffer is available with keyboard arrow
  keys and other methods

3
Command Modes

• Non-privileged (what you start in, prompt is gt)
• Commands available include enable, exit, ping,
  show (limited), systat, telnet (to another host),
  terminal, and traceroute
• Generally used for status checking and limited
  troubleshooting while preventing serious
  configuration errors
• Privileged (entered with enable, prompt is )
• All commands available, and supersets of the
  features for some non-privileged commands
• Generally used by network managers for
  configuration
• Multiple sub-modes available
• Return to non-privileged mode with disable

4
Privileged Command Modes

• Global configuration mode
• Entry example configure terminal
• Prompt example ap1(config)
• Exit example Exit or Cntl/Z or end
• Interface configuration mode
• Entry example interface Dot11Radio 0
• Prompt example ap1(config-if)
• Exit takes you back to global configuration mode
• Cntl/Z or end takes you out of configuration mode
  entirely

5
Invoking and Negating Commands

• Ordinary commands take effect immediately
• ap(config)hostname ap1
• ap1(config)
• Commands are negated (canceled) with a no
  prefix
• ap1(config)no hostname ap1
• ap(config)

6
Multiple Configuration Files

• show running-config
• Displays the configuration currently used
• The running configuration is not automatically
  saved (can be a good thing or a bad thing!)
• show startup-config
• Displays the last (and possibly next!) boot-up
  configuration to be used
• copy running-config startup-config
• Saves the running-config to the startup-config
• copy running-config tftp
• Saves the running-config to a TFTP server
  (prompts for address or name, etc.)

7
You may need to check documentation, test,
verify, confirm . . .

• Check your running and startup config hostname
• Use the hostname command to change it
• Check your running and startup configs
• Use the no hostname command to remove it
• Check your running and startup configs
• Change the host name using the Web interface
• Check your running and startup configs
• And this doesnt even address
• What you get with an snmpget of sysName
• What happens when you set System Name rather
  than Host Name in the web interface
• What happens when you use snmpset for sysName
• Etc.