Copia de respaldo de las imagenes IOS de los Dispositivos.

Siempre hacer copias de respaldo es importante y mas en estos dispositivos tan sensibles como son los routers o switchs de red. Una forma fácil y segura de hacerlo es con un servidor TFTP para tener a salvo las imágenes de nuestro dispositivos porque sin ellas son inservibles. Aqui la forma correcta de hacerlo.
Descargar archivo PKT
Copia de Respaldo del IOS del Sistema.
Router#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#interf g0/0
Router(config-if)#ip add 192.168.1.1 255.255.255.0
Router(config-if)#no sh

Router(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up

Router(config-if)#exit
Router(config)#interf g0/1
Router(config-if)#ip add 192.168.2.1 255.255.255.0
Router(config-if)#no sh

Router(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up
Router(config-if)#end
Router#copy run start
Destination filename [startup-config]?
Building configuration...
[OK]
Router#sh flash

System flash directory:
File  Length   Name/status
  3   33591768 c1900-universalk9-mz.SPA.151-4.M4.bin
  2   28282    sigdef-category.xml
  1   227537   sigdef-default.xml
[33847587 bytes used, 221896413 available, 255744000 total]
249856K bytes of processor board System flash (Read/Write)

Router#copy flash tftp
Source filename []? c1900-universalk9-mz.SPA.151-4.M4.bin
Address or name of remote host []? 192.168.1.2
Destination filename [c1900-universalk9-mz.SPA.151-4.M4.bin]?

Writing c1900-universalk9-mz.SPA.151-4.M4.bin....!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 33591768 bytes]

33591768 bytes copied in 4.122 secs (855651 bytes/sec)
Router#

Copia de Respaldo del IOS del Switch.
Switch>ena
Switch#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#ip defaul
Switch(config)#ip default-gateway 192.168.2.1
Switch(config)#interf vlan 1
Switch(config-if)#ip add 192.168.2.2 255.255.255.0
Switch(config-if)#no sh

Switch(config-if)#
%LINK-5-CHANGED: Interface Vlan1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up

Switch(config-if)#end
Switch#
%SYS-5-CONFIG_I: Configured from console by console

Switch#copy run start
Destination filename [startup-config]?
Building configuration...
[OK]
Switch#show flash
Directory of flash:/

    1  -rw-     4414921          <no date>  c2960-lanbase-mz.122-25.FX.bin
    2  -rw-        1089          <no date>  config.text

64016384 bytes total (59600374 bytes free)
Switch#copy flash tftp
Source filename []? c2960-lanbase-mz.122-25.FX.bin
Address or name of remote host []? 192.168.1.2
Destination filename [c2960-lanbase-mz.122-25.FX.bin]?

Writing c2960-lanbase-mz.122-25.FX.bin....!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 4414921 bytes]

4414921 bytes copied in 3.289 secs (36471 bytes/sec)
Switch#

Con esto tendremos guardado en el servidor TFTP los IOS de nuestros dispositivos por si surge algo. No dejes de verlo en la parte de servicios TFTP del servidor.
También se puede hacer una copia de respaldo del archivo de configuración con el siguiente comando.
Switch#copy startup-config tftp
Address or name of remote host []? 192.168.1.2
Destination filename [Switch-confg]?

Writing startup-config.....!!
[OK - 1089 bytes]


1089 bytes copied in 7.026 secs (154 bytes/sec)

Para el router con el mismo comando.
Router#copy startup-config tftp
Address or name of remote host []? 192.168.1.2
Destination filename [Router-confg]?

Writing startup-config...!!
[OK - 636 bytes]

636 bytes copied in 0.001 secs (636000 bytes/sec)

Router#