Cisco vro basic configuration tutorial route settings tutorial

Comments: This article describes the basic configurations of Cisco routers. The configuration process of Cisco routers is still complicated, and there are many factors to consider, especially in terms of security. In fact, there is no need to make the router think so complicated. In fact, the router is a computer with multiple ports, but it plays a different role in the network than the general PC. How can we truly configure Cisco routers? Next, we will give a detailed introduction to this issue.
1. Introduction to Cisco Routers
IOS is an embedded software architecture configured for all Cisco routers.
Like a common computer, a router also needs an operating system. Cisco calls this operating system a Cisco interconnected network operating system, which is also known as IOS.
Cisco IOS software provides the following network services: scalable network structure, basic routing and switching functions, reliable and secure access to network resources. The Cisco command line interface (CLI) uses a hierarchical structure that completes specific tasks in different modes. For example, to configure a vro interface, you must enter the interface configuration mode of the vro. All configurations are only applied to this interface. Each configuration mode has a specific command prompt. EXEC provides a command interpretation service for IOS software. When each command is typed, EXEC will execute this command.
Ii. Cisco router configuration
When we configure a Cisco router for the first time, we need to configure it from the console port. The following describes how to connect to the control port and set the virtual terminal program:
(1) Use the rolover line and a RJ45 and DB9 or DB25 conversion adapter to connect the router control port and terminal computer. How to connect to the control port of the Cisco router: the control port and the Auxiliary port are the two management ports of the Cisco router, both ports can be used for the first Cisco router configuration, but we generally recommend that you use control ports because not all routers have AUX ports.
(2) When a vro is started for the first time, there is no network parameter by default, and the vro cannot communicate with any network. So we need a RS-232ASCLL terminal or computer simulation ASCLL terminal and control port connection.
(3) how to connect to the CONSOLE Port
Connection cable: connecting to the console port we need a rolover cable and an adapter for RJ-45 to DB-9. We can see this in the product attachment of the Cisco router.
Terminal simulation software: the PC or terminal must support the VT100 simulation terminal. Usually HyperTerminal software is used in the WindowsOS environment. Here we take the host name as riga as an example. In Global mode, enter hostnameriga and press enter to execute the command. Then, the host name before the host prompt changes to riga, indicating that the host name is successfully set.
3. Enter the Cisco router configuration mode
The command line port of a Cisco router uses a hierarchical structure, which requires logging on to different modes to complete detailed configuration tasks. From a security perspective, Cisco IOS software divides EXEC sessions into USER mode and privileged mode.
Iv. Features of privileged Mode
In privileged mode, you can use all the configuration commands. In user mode, a password is generally required to access privileged mode. The command prompt of router # indicates that the user is in privileged mode.
V. Features of the USER Mode
Only basic monitoring commands are allowed in USER mode. In this mode, the configuration of the Cisco router cannot be changed. The command prompt of router> indicates that the USER is in USER mode.
Vi. Cisco router configuration mode
In user mode, users can only display router information, but cannot change any Cisco router configuration. To use all commands, you must enter the privileged mode. In privileged mode, you can also enter global mode and other special configuration modes, which are a subset of global mode.
VII. Privileged Mode
After the first successful startup, the Cisco router prompts the user mode prompt router>. If you want to enter the privileged mode, type the enable command (no password is required when you start the router for the first time ). At this time, the command prompt of the router is changed to router #.
8. Global Mode
After entering the privileged mode, we can enter the configureterminal command at the privileged command prompt to perform the global configuration mode.
9. Port Configuration Mode
Enter interfacee0 at the global command prompt to enter the first Ethernet port, and enter interfaceserial0 to enter the first serial line port. The above briefly introduces how to enter the various configuration modes of the Cisco router. Of course, other special configuration modes can be entered in global mode. In the configuration process, we can use? To obtain command help.
10. Cisco router configuration Password
In Cisco router products, we usually need to restrict the access of general users during initial configuration. This is very important for Cisco router configuration. By default, our router is an open system and the access control options are disabled, any user can log on to the device to initiate further attacks, therefore, our network administrator needs to configure a password to restrict unauthorized users from accessing devices through direct connections, CONSOLE terminals, and dial-up MODEM lines. Next we will introduce in detail how to configure the vro password on the Cisco router product.