Bringing Up a Cisco Router involves pluging in the power cord inlet into the provided port, and then plug the the power cord terminals into a power source. The next thing is to power on the router by pressing the power button provided on the router. When you first bring up a Cisco router, youe will hear a high exhaling sound fro the router and then it will start running what is known as a power-on self test (POST),
and if that passes, it will look for and load the Cisco IOS
from Flash memory if a file is present. Flash memory is an electronically erasable programmable read-only memory (EEPROM).
The IOS will load and then look for a valid configuration called startup-config that is stored by default in
nonvolatile RAM (NVRAM).
If there is no configuration in NVRAM, then the router will bring up what
is called setup mode
setup mode is a step-by-step process to help you configure a router.
You can also enter setup mode at any time from the command line by
typing the command
from global configuration mode. Setup only covers
some very global commands, but is helpful if you don’t know how to configure
certain protocols, like bridging or DECnet, for example.
You actually have two options when using setup mode:
Basic Management and Extended Setup
Basic Management only gives you enough configurations to allow connectivity to the router, whereas Extended Setup allows you to configure some global parameters as well as interface configuration parameters.