When working with the Cisco ISO it’s normal to receive some warnings and messages and they are vital for knowledge of the system but some tend to interrupt while working on a router. If you agree with the later one then disabling some of the unnecessary one’s is not that hard.
Router#config t
Router#line con 0
Router#logging synchronous
Router#line vty 0 4
Router#logging synchronous
Router#^Z
In privileged mode Cisco routers attempt to resolve DNS hostname to IP addresses, this can frustrating when entering a wrong command creating a 30 to 40 second delay, the solution is to disable DNS look up.
Router#config t
Router#no ip domain-lookup
Router#^z
The result from now on will be “% Unknown command or computer name, or unable to find computer address“.
There is no need to erase the whole configuration if you need to wipe the interfaces, just erase the configuration on the interface instead.
Router(config)#default interface
Example =
Router(config)#default interface fastethernet0/0
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First make sure the router has enough flash memory to support the image.
To back up the IOS image use the following copy TFTP command, you will have to provide the address for the remote host.
Router#copy flash tftp
Source filename []? d1205.bin
Address or name of remote host []?
192.168.1.21
Destination filename [d1205.bin]?
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
3289170 bytes copied in 47.668 secs (69982 bytes/sec)
Just in case you have no idea of what version the installed ISO is issue the following command.
Router#show flash
System flash directory:
File Length Name/status
1 3289170 d1206.bin
[3289236 bytes used, 905068 available, 4194304 total]
4096K bytes of processor board System flash (Read/Write)
To copy the IOS from an TFTP server use the command :
Router#copy tftp flash
Address or name of remote host []? 192.168.1.21
Source filename []? d1206.bin
Destination filename [d1206.bin]?
Accessing tftp://192.168.1.21/d1206.bin…
Erase flash: before copying? [confirm]
Erasing the flash filesystem will remove all files! Continue? [confirm]
Erasing device… eeeeeeeeeeeeeeee …erased
Erase of flash: complete
Loading d1206.bin from 192.168.1.21 (via Ethernet0): !!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 3289170/6578176 bytes]
Verifying checksum… OK (0xB6BD)
3289170 bytes copied in 89.272 secs (36956 bytes/sec)
Flash memory will be erased before the new IOS is installed
Note : The IOS is always store inflash memory
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