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Cisco makes many items today. They are known for their routers and switches in the past but have recently offered many new products including NAS, SAN, and server solutions along with VoIP phones and supporting hardware.

Most Cisco devices use a command line interface to their own Cisco IOS or Cisco Internetwork Operating System that controls how the routers and switches work. Some common actions on Cisco IOS setup are listed below.

• Add a DHCP Pool

  ip dhcp pool [Pool Name]
     network [eg.. 172.16.0.0] [mask eg.. 255.255.252.0]
     dns-server [208.67.222.222 208.67.220.220]
     default-router [172.16.0.1]
  

• NAT

  ip nat inside source list 1 interface FastEthernet0/0 overload
  !
  access-list 1 permit 10.0.38.0 0.0.0.255
  

• Fix a failed Router IOS upgrade.

  1. With the router off remove the Compact Flash
  2. Power on and wait for ROMMON mode. (you can get here another way too.)
  3. Type "confreg"
  4. Yes
  5. Select no or the default value until you get to the boot options..
  6. Change boot options to 0
  7. No to the more changes dialog
  8. Type "reset"
  9. Power off the router and add the Compact Flash and then power on again.
  10. Type "IP_ADDRESS=[temporary router address]"
  11. Type "IP_SUBNET_MASK=[mask for above]"
  12. Type "DEFAULT_GATEWAY=[gateway]"
  13. Type "TFTP_SERVER=[your tftp server]"
  14. Type "TFTP_FILE=[filename]"
  15. Type "tftpdnld"
  16. Wait...
  17. Type "reset"
  18. Wait...
  19. Type "confreg" and change the boot setting to 2 like you did above
  20. Type "reset"
  21. Wait...
  22. Done, have fun, relax

• Cellular Modem (GSM)

  1. router# cellular 0/1/0 gsm profile create 1 isp.tld chap user password
     Write the config to the Card.
  2. router(config)#chat-script gsm "" "ATDT*99*1#" "CONNECT"

  3. interface Cellular0
      description *** GSM ***
      ip address negotiated
      ip nat outside
      ip virtual-reassembly
      encapsulation ppp
      dialer in-band
      dialer idle-timeout 7200
      dialer string gsm
      dialer-group 1
      async mode interactive
      ppp chap hostname isp
      ppp chap password 0 isp
      ppp ipcp dns request
     !

• Remote Shell

  aka handy backup and management practice...

Setup

Assuming your device is setup with a management network on vlan50 and you are running a script as root on your Linux box at IP 172.20.2.10...

!
username remote privilege 7 secret 5 $1$oft2$Ln
!
ip rcmd rcp-enable
ip rcmd rsh-enable
ip rcmd remote-host remote 172.20.2.10 root enable
ip rcmd remote-username remote
ip rcmd source-interface Vlan50
!

Note:Different versions of IOS handle things strangely. Read the docs and read the help hints on the cli.

Use

rsh -l remote 172.20.2.1 show run > cisco.`date +%F`.conf

Which will give you a file with a copy of the running configuration. You can do other more complex things but this is a good way to automate backups.