Overview of Configuration of Network Devices (contd..)

Overview of Configuration of Network Devices

Contd....

Router Memory

Router Memory cont.

RAM

- Store running or active configuration file

- Loses content when router is powered down

- A working storage

ROM

- Read-Only Memory 

- Stores bootable IOS image and bootstrap program

NVRAM 

- Provides storage for the startup configuration file 

- Retains content when router is powered down

Flash memory

- Holds the fully functional IOS image

- Retains content when router is powered down

- Is a type of electronically erasable, programmable ROM (EEPROM)

Displaying configuration files

show running-config

show startup-config

Managing configuration files

Copy Command

- copy files in a router (configuration file, new version of the IOS Software)

- Move configuration files among RAM, NVRAM, and TFTP server

copy running-config startup-config

Changes to the router are put in the running-config file.

If the router loses power or reboots, everything in RAM is lost including the running-config file.

To make sure the changes to the router’s configuration remain saved, you must copy the running-config from RAM into the startup-config into NVRAM:

Router# copy  running-config  startup-config

Router#copy running-config startup-config

Destination filename [startup-config]?

Building configuration...

Router#show startup-config

!

version 12.0

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname Router

!

!

ip subnet-zero

!

interface Ethernet0

 no ip address

 no ip directed-broadcast

 shutdown

!

• The startup-config file now identical to running-config and the router will also have these changes if the router reboots.

Thank you.