A comprehensive description of Cisco router configuration steps

Currently, Cisco routers have become a leader in the routing industry. Many people may not understand the configuration steps of Cisco routers. It does not matter. After reading this article, you will certainly have a lot of GAINS, I hope this article will teach you more things. The company is headquartered in Beijing and has three branches nationwide.

It is required that data in four locations be queried in real time, so that the salesman can make correct decisions based on the specific situation. Early solutions were to connect a vro to the headquarters in Beijing through a DDN private network with a speed of kbps. However, through market research, technicians found that the network operation cost was too high. Through further consultation and adjustment, the final solution is that the branch uses DDN to access the Internet locally, and the Headquarters uses Ethernet to access the Internet nearby. Configure the interconnected Cisco router and use VPN technology to ensure secure transmission of internal data over the Internet. The network distribution of the enterprise is shown in the figure below.

Configuration process and test procedure

Before implementing the configuration, check whether the hardware and software support VPN. For Cisco router configuration, the IOS version must be later than 12.0.6 (5) T and provide the IPSec function. This configuration is successfully configured on the Cisco router. The following is the actual configuration process of the vro1 in branch network 1. The configuration methods of other vrouters are basically the same. You only need to modify the specific environment parameter IP address and interface name.

Configure basic vro parameters and test network connectivity

1) enter the Cisco router configuration mode

Connect the computer serial port to the vroconsole console port and configure the "terminal simulation" program according to the vro instructions. Run the following command to enter the configuration mode.
Router> en
Router # config terminal
Router (config )#
 
2) Configure basic security parameters for the vro

It mainly sets the privileged password, remote access password, and vro name to facilitate remote debugging.
Router (config) # enable secret xxxxxxx
Router (config) # line vty 0 4
Router (config-line) # password xxxxxx
Router (config-line) # exit
Router (config) # hostname huadong
Huadong (config )#

3) configure the Ethernet interface of the router and test the connectivity with the local computer.

Note: before configuring a Cisco router, connect the cable to the relevant device. Port ethernet0/0 is connected to the internal network, and port serial0/0 is connected to the external network. The external network interface address is allocated by the ISP. At least one address is provided. Assume that this is one of the following. In PAT mode, the address is 210.75.32.9, and the upper-level router is 210.75.32.10. The internal network address is shown in the figure. The key is to configure IP addresses and enable Ethernet interfaces. During the test, ping the basic test command.
Huadong (config) # inter eth0/0
Huadong (config-if) # ip address 172.17.1.1 255.255.255.0
Huadong (config-if) # no shutdown
The following is a test command:
Huadong # ping 172.17.1.1
...
!!!!!
...
Huadong # ping 172.17.1.100
...
!!!!!
...
On a computer whose IP address is 172.17.1.100:
C:> ping 172.17.1.1
Pinging 172.17.1.1 with 32 bytes of data:
Reply from 172.17.1.1: bytes = 32 time = 5 ms TTL = 255
......
The result shows that the connection and Cisco router are correctly configured.

4) configure the serial port of the Cisco router and test the connectivity with the superior Router

Similar to the Ethernet port configuration method, you must specify the bandwidth and package Encapsulation Format. In addition, disable the CDP protocol specific to the Cisco device to ensure basic security.
Huadong (config) # inter serial0/0
Huadong (config-if) # ip address 210.75.32.9 255.255.255.252
Huadong (config-if) # bandwidth 256
Huadong (config-if) # encapsulation ppp huadong (config-if) # no cdp enable