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 Cisco Router CLl Commands continued  

3. Global configuration mode (the settings affects all interfaces and neighboring routers)

   a. to   enter into global configuration mode :

      router# config terminal   (or) conf t

      then the prompt becomes
      
      router(config)#

   3.1 interface configuration mode :

      a. to enable ethernet port 0 of the router :

         router(config)# interface ethernet 0   (or) router(config)# int e0
         
         then the prompt becomes

         router(config-if)# ip address <ip address> <smask>
         router(config-if)# no shutdown   (or)   router(config-if)# no shut   <-- to enable e0
         router(config-if)# exit

      b. to enable serial port 0 of the router :

         router(config)# interface ethernet 0   (or) router(config)# int e0
         
         then the prompt becomes

         router(config-if)# ip address <ip address> <smask>
         router(config-if)# no shutdown    (or)   router(config-if)# no shut   <-- to enable e0
         router(config-if)# clock rate 64000   <-- only if the cable end is dce
         router(config-if)# exit

   3.2 sub-interface configuration mode

      a. to configure ethernet port 0.1

         router(config)# interface ethernet 0.1
         router(config-sub-if)# ip address <ip address> <smask>
         router(config-sub-if)# no shutdown
         router(config-sub-if)# exit

   3.3 line configuration mode

      a. to configure console port

         router(config)# line console 0
         router(config-line)# login
         router(config-line)# password <password>
         router(config-line)# exit


      b. to configure auxillary port

         router(config)# line aux 0
         router(config-line)# login
         router(config-line)# password <password>
         router(config-line)# exit

      c. to configure virtual teletype(vty) port

         router(config)# line vty 0
         router(config-line)# login
         router(config-line)# password <password>
         router(config-line)# exit

      d. to configure virtual teletype(vty) port and to save same password for all 5(0 to 4) user

         router(config)# line vty 0 4
         router(config-line)# login
         router(config-line)# password <password>
         router(config-line)# exit

   3.4 router configuration mode

      a. to configure rip in a router

         router(config)# router rip
         router(config-router)# network <network ip>
         router(config-router)# network <network ip> ... upto number of networks to be advertised)
         router(config-line)# exit

      b. to remove a network from rip

         router(config)# router rip
         router(config-router)# no network <net ip>

There are more commands and configurations that can be used in various above modes.

• Every active interface on a Cisco router to be used with IP requires an IP address assigned to it. This short and sweet  describes how to set an interface’s IP address.
   

• The default route is the IP address of the next hop when no other routes are known.

• Every packet that enters a router is inspected to determine the destination IP address. Based on that destination address the router then consults the routing table to determine where to send the packet. The only item of interest to the router is the destination address. Nothing else matters.

Save a Configuration to a File
 
You might want to save a configuration to a file so that you can edit it with a text editor of your choice. You can save your current configuration to an ASCII file, which saves the configuration in its current form, including any uncommitted changes. If more than one user is modifying the configuration, all changes made by all users are saved.

To save software configuration changes to an ASCII file, use the save configuration mode command:

[edit]

user@host# save filename

[edit]

user@host#



By default, the configuration is saved to a file in your home directory, which is on the flash disk.