A detailed explanation of Cisco router's initial configuration

First, the initial sequence of router boot

When the router is initialized, the router does the following:

1 from the ROM implementation of the self-test, detection of CPU, memory, interface Circuit basic operation.

2 from ROM to boot, the operating system installed to download to main memory.

3 The boot system is downloaded by flash or the network, and the Boot system command for the configuration file determines its exact location.

4 operating system download to low address memory, after downloading by the operating system to determine the router's working hardware and software parts and display its results on the screen.

5 The configuration file stored in NVRAM is loaded into the main memory and is configured to start the routing process, provide the interface address, and set the media characteristics. If there is a valid configuration file in the NVRAM, enter setup session mode.

6 then enter the system configuration session to display configuration information, such as configuration information for each interface.

Second, the setup session

When there is no valid configuration file in the NVRAM, the router automatically enters Setup session mode. You can also configure setup at the command line later.

The Setup command is an interactive command, each of which has a default configuration, and if you use the default configuration, you can hit enter. If the system has already been configured, the current configuration value is displayed. If this is the first time configuration, the factory settings are displayed. When the screen displays "------more------", type the spacebar to continue; If you exit from setup, just type ctrl-c.

1, the main parameters of the setup:

Configure its general parameters, including:

Host Name: hostname

Privileged Password: enable password

Virtual Terminal password: Virtual terminal password

SNMP Network management: SNMP network Management

Ip:ip

IGRP Routing protocol: IGRP Routing

RIP routing protocol: RIP Routing

Decnet:decnet. Wait

Where the Console's Secret, password settings:

Enable Secret

Enable Password

Virtual Terminor's password settings:

Line Vty

Password

Settings for Host name:

Hostname

2, Setup interface parameters:

Set interface parameters, such as Ethernet port, tokenring port, synchronization port, asynchronous port, etc. Including IP address, subnet screen, tokengring rate, etc.

3. Setup Description:

After setting the above parameters, the command prompts whether to use the above configuration, if the answer is "yes" then the system will store the above configuration parameters, the system can be used.