Step by step Install Router Cisco / Langkah - langkah Install router Cisco

Initialize the router is done by loading the bootstrap , the operating system and configuration files . If the router can not find the configuration file , it will enter setup mode . After completing the configuration in setup mode , it will create the configuration file and stored in NVRAM . 

The purpose of the startup process is to start running the router operations . The startup process must go through the following process :
- Verify router hardware functions 
- Finding and Cisco IOS software load 
- Search for and run a configuration file or enter setup mode 

When the power is first turned on the router , it performs a power - on self test ( POST ) . During the self test , the router perform diagnostics from ROM to all hardware modules . Diagnosis is to verify the basic operation of the CPU , memory and network interface ports . Once the verification is complete , the router software initialization process with the following procedures :
 - Generic bootstrap loader in ROM is executed . The bootstrap is a simple commands for hardware testing   and initialization IOS . 
- IOS can be found in several places . Boot field of the configuration register determine the location that is used to load the IOS . If the boot is filed leading to flash or network , then the boot system commands in the configuration file also shows the location of the image . 
- Operating system image is loaded . When the IOS loaded and operated , register hardaware and software components will be displayed on the terminal console screen . 
- The configuration file in NVRAM is loaded into main memory and executed . The commands in the configuration file is run to start the process of routing , addressing the interface and determine other characteristics . 
- If the configuration file is invalid , the operating system will search for the configuration file on the TFTP server available . If not found TFPT server , the setup dialog that will be used. 20Setup mode aims to allow network administrators to download the install base configuration of the router when the router has no configuration file . In this mode marked by square brackets [ ] . Press Enter to use the default option . Ctrl - C to end the process . 

When the configuration process is completed in the setup mode , the display below will appear on the display console terminal .

[0] Go to the IOS command prompt without saving this config.
[1] Return back to the setup without saving this config. 
[2] Save this configuration to nvram and exit. Enter your selection 
[2]: 

Cisco routers use LED as a status indicator. LED indicator to indicator interface shows the status of each interface. Flame LEDs indicate the interface is active and connected to the network, otherwise the LED does not light show interface inactive. If the interface is too busy, the LED flash is marked in green. The color green means OK.

Statement NVRAM invalid, possibly due to write erase means the router is not configured or the contents of the NVRAM is removed. To be valid NVRAM so the router must be configured and the configuration file stored in NVRAM. Factory-default setting for the configuration register is 0x2102, which means that the router should load the Cisco IOS image from flash memory.

User can determine the version of the bootstrap and IOS versions. And also contains the following information:
- The number of interfaces
- Type of interface
- The amount of NVRAM
- The amount of flash memory 

User has the option to enter the setup mode. And the purpose of setup mode is to allow the administrator to install the basic configuration.