Introduction to Cisco router configuration and initial installation

This document uses Cisco as an example to introduce the configuration and initial installation of Cisco routers, as well as the configuration and remote access methods of Cisco routers, this article discusses how to use the internal network DHCP service function to allocate addresses to users and common troubleshooting skills.

1. Initial installation

During the first installation, the system automatically enters the Dialog Setup, as prompted on the screen, answer the router name, encrypted super login password, super login password, remote login password, dynamic routing protocol, and the configuration of each interface, and save the configuration. After the vro name appears, run the enable command and enter the super logon password. If the vro name appears, the name is Cisco2620. After the Cisco2620 # prompt is displayed, the vro mode is enabled, now you can configure the Cisco router.

2. Configure the vro

Type config terminal. The prompt Cisco2620 (config) # appears to enter the configuration mode.

(1) set the password for the Cisco Router

Cisco2620 (config) # enable secret 123123: Set the privileged mode password to 123123

Cisco2620 (config) # line console 0: Enter the Console port configuration mode

Cisco2620 (config-line) # password 123123: Set the Console port password to 123123

Cisco2620 (config-line) # login: Make the console port configuration take effect

Cisco2620 (config-line) # line vty 0 5: Switch to remote logon Port

Cisco2620 (config-line) # password 123123: Set the remote logon password to 123123

Cisco2620 (config-line) # login: Make the configuration take effect

(2) configure a Fast Ethernet port for a Cisco Router

Cisco2620 (config) # interface fastFastethernet 0/0: enter the port configuration mode

Cisco2620 (config-if) # ip address 192.168.1.6 255.255.255.0: Set the ip address and mask

Cisco2620 (config-if) # no shutdown: Enable the port

Cisco2620 (config-if) # exit: exit from Port Configuration Mode

(3) Configure synchronous serial ports for Cisco Routers

Cisco2620 (config) # interface serial 0/0: Enter synchronous serial port settings.

Cisco2620 (config-if) # ip unnumbered fastfastfastethernet 0/0: Synchronous Serial Port uses the same ip address as the fast Ethernet port.

Cisco2620 (config-if) # encapsulation ppp: sets the data link layer protocol as PPP.

(4) configure the 16-port Modem dial-up module on the Cisco router and use the internal DHCP service to assign addresses to the dial-in users.

Cisco2620 (config) # interface Group-Async1.

Cisco2620 (config-if) # ip unnumbered FastEthernet0/0.

Cisco2620 (config-if) # encapsulation ppp.

Cisco2620 (config-if) # ip tcp header-compression passive: Enable passive IP header compression.

Cisco2620 (config-if) # async mode dedicated: works only in asynchronous mode.

Cisco2620 (config-if) # peer default ip address dhcp: Forward ip address requests to the DHCP server.

Cisco2620 (config-if) # ppp authentication chap: sets authentication as CHAP.

Cisco2620 (config-if) # group-range 33 48: the dial-up group contains 16 ports.