Basic ios commands cisco

Skip to content Skip to footer. Search Find Matches in This Book. PDF - Complete Book Book Table of Contents. Introduction A through B C commands D through E F through K L through mode monitor event-trace through Q R through setup show through show fm summary show gsr through show monitor event trace show monitor permit list through show process memory show protocols through showmon slave auto-sync config through terminal-type test cable-diagnostics through xmodem ASCII Character Set and Hexadecimal Values Notes This document contains Cisco IOS commands that are supported in many different software releases and on many different platforms.

Some of the commands that are included in this document may not be supported in your Cisco IOS software release.

basic ios commands cisco

Any Internet Protocol IP addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.

Was this Document Helpful? Yes No Feedback. Related Cisco Community Discussions.Here is the detailed Cisco router configuration commands list, which can be implemented with packet tracer. Packet tracer is a network simulator used for configuring and creating the virtual cisco devices and network. There are also some other similar software but Cisco IOS output will be same on all simulators.

Cisco Router Configuration Commands – CLI Cheat Sheet

Related Article: PowerShell vs Command prompt. To configure any device in packet tracer you are required to open or access its CLI. You can do it by clicking any device and then navigating to CLI tab. Cisco IOS supports numerous command modes which can be practice with packet tracer, followings are the main command modes of cisco CLI with specific commands to navigate from one mode to other.

Watch a video of rommon mode. IOS commands are not case sensitive it means that you can use them in uppercase, lowercase, or mixed case, but passwords are case sensitive. Therefore make sure you type it in correctly.

In any mode, you can obtain a list of commands available on that mode by entering a question mark? You can set the password for protecting enable mode by following command: Following command will set the password to cisco. You can access the cisco router remotely by VTY lines, these are the Virtual Terminal lines for access router, you can set password on these line by using the following commands:. Router config access-list 2 deny Router config-router ip route Why we use RIP?

Why we use OSPF? You can run all these command for checking different setting of Cisco device in privileged EXEC mode:. Save my name, email, and website in this browser for the next time I comment.

RIP Configuration Commands. Enable OSPF routing on router. AS number is a number must be same for networks which are desired to connect with each other.To control access to Network Time Protocol NTP services on the system, use the ntp access-group command in global configuration mode.

To remove access control to the NTP services, use the no form of this command. Allows time requests and NTP control queries and permits the system to synchronize with the remote system.

Allows time requests and NTP control queries, but does not allow the system to synchronize with the remote system. You must configure the ntp server ip-address command before using the serve-only keyword. The access-list-number-expanded argument was added. Support in a specific This command was modified. The access-list-name argument and kod keyword were added. Support for IPv6 was added. Support for IPv6 access list was added. The ipv4 and ipv6 keywords were added.

The access group options are scanned in the following order from the least restrictive to the most restrictive:. Access is granted for the first match that is found. If no access groups are specified, comprehensive access is granted to all sources. If you specify any access groups, only the specified access is granted. This facility provides minimal security for the time services of the system.

However, it can be circumvented by a determined programmer. For tighter security, use the NTP authentication facility. The NTP service can be activated by entering any ntp command. When you use the ntp access-group command, the NTP service is activated if it has not already been activated and access control to NTP services is configured simultaneously. When you enter the no ntp access-group command, only the access control to NTP services is removed.

To disable the NTP service on a device, use the no ntp command without any keywords in global configuration mode. For example, if you want to remove the access control to NTP services, and all NTP functions from the device, use the no ntp command without any keywords.

If you do not specify the ipv4 or ipv6 keyword, the IPv4 access list is configured by default. The following example shows how to configure a system to allow itself to be synchronized by a peer from access list However, the system restricts access to allow only time requests from access list In the following IPv6 example, a KOD packet is sent to any host that tries to send a packet that is not compliant with the access-group policy:. To allow the processing of private mode Network Time Protocol NTP packets, use the ntp allow mode private command in global configuration mode.The basic CLI commands for all of them are the same, which simplifies Cisco device management.

Here is a Cisco commands cheat sheet that describes the basic commands for configuring, securing and troubleshooting Cisco network devices. Register for Free Webinar:. Number of Employees 1 - - - 2, 2, - 7, 7, - 25, More than 25, We never share your data. Privacy Policy. Please note that it is recommended to turn JavaScript on for proper working of the Netwrix website. Go Up. Cisco Commands Cheat Sheet. The access port is set to access unconditionally and operates as a non-trunking, single VLAN interface that sends and receives non-encapsulated non-tagged frames.

An access port can be assigned to only one VLAN. The trunk port sends and receives encapsulated tagged frames that identify the VLAN of origination. A trunk is a point-to-point link between two switches or between a switch and a router.

In this mode, the switch supports simultaneous tagged and untagged traffic on a port. Both values can be specified in a single command to allow both Telnet and SSH access default settings.

Introduction to Cisco IOS CLI (Command-Line Interface)

Specify the number or name of the desired severity level at which messages should be logged. Previous Best Practice. Next Best Practice.

User Termination Best Practices. Privileged Account Management Best Practices. Network Security Best Practices. We use cookies and other tracking technologies to improve our website and your web experience. To learn more, please read our Privacy Policy. Okay, got it. An enable mode command that saves the active config, replacing the startup config when a Cisco network device initializes.The hostname command is used to configure the device hostname.

Because this command changes a device configuration, it must be entered in the global configuration mode. After typing the command, the prompt will change and display the new hostname.

basic ios commands cisco

Here is an example that shows you how to change a hostname of a device. First, enter the global configuration mode by typing the enable command in the user EXEC mode and the configuration terminal command in the privileged EXEC mode.

Once inside the global configuration mode, type the command hostname R1. Notice how the prompt was changed to reflect the configured value. By default, all interfaces on a Cisco router are turned off.

To enable an interface, the no shutdown command is used. You first need to enter the submode of the interface that you want to configure. You may notice that the promt has changed to reflect the mode you are currently in. Once inside the interface mode, you can enable an interface by typing the no shutdown command. The ip address interface mode command is used to assign an IP address to an interface.

basic ios commands cisco

For example, if we want to assign an IP address of What if you had made a mistake and written the ip address Well, you can remove the wrong IP address by typing the same command, but this time with the no keyword in front of it, in our case no ip address. You can remove any command from your IOS configuration by using the no keyword in front of the command.

Each Cisco IOS device has the built-in authentication features. There are three basic ways to configure authentication on a device:. This will force a user to type the password when trying to access the device through the console port.

The first command defines a range of virtual terminal sessions that you would like to configure. A virtual session can be a telnet or SSH session. Cisco devices usually supports 16 concurrent VTY sessions. So, this command usually looks like this: line vty 0 The login command allows a remote access to a device.

It is required in order for telnet to work. Both of the commands above accomplish the same thing, but with one major difference. This presents a security risk because an attacker could easily find out passwords.

Cisco IOS Configuration Fundamentals Command Reference

The global configuration service password-encryption command encrypts all passwords configured. It is important to note that this type of password encryption is not consider especially secure, since the algorithm used can be easily cracked.

Cisco recommends using this command only with additional security measures. You can display a banner on a Cisco device. A banner is usually shown before the login prompt. It is usually some text that appears on the screen when a user connect to the device e. This banner, if configured, is shown before the login prompt to every user that is trying to establish a session with the device.

The following global configuration command is used to configure a MOTD banner:. A delimiting character is a character of your choice. Its purpose is to signify the start and end of a text that will appear in the banner.

For example, the command banner motd Unauthorized access forbidden!Copies the current router configuration to Nvram for use at next boot up.

Copy startup-config running-config. Sets the router configuration back to its startup configuration. Displays basic router and IOS info. Displays information on each router interface. Displays current routing table. Displays each access control list. Turns on ip routing. Turns off ip routing. Adds a static route. Removes a static route.

Configure terminal.

basic ios commands cisco

Moves user from privileged mode to global configuration mode. Moves user from global configuration mode to interface configuration mode. Logs off the router.

Cisco IOS Switch Commands Cheatsheet

Returns user to privileged mode. Returns user to global configuration mode. Sets ip address of an interface. Turns on routing information protocol. Turns off routing information protocol. Turn on rip broadcasts for certain networks and therefore interfaces.

Set at enable secret password.In this lesson, you will learn how to create a basic configuration for a Cisco IOS router. Most networking vendors, including Cisco have different router models. If you are new to networking, you will probably start with some of the smaller routers. Cisco has the integrated services routers which are routers but these devices also offer some other services like wireless or Voice over IP.

Basic Cisco IOS Commands

These routers are not the newest models but are still very popular and used often in home labs. These WIC slots can be used to add certain cards. For example, DSL modems, serial interfaces, wireless access points and so on. First we will connect our blue Cisco console cable to our router and start Putty so that we can connect to the router:. Make sure to check this number in the Windows device manager.

Once you are connected to the console port and switch on the power, you will see something like this:. This is a bit similar to the BIOS of a computer. It allows the router to perform some basic functions like loading the IOS operating system, which occurs next:.

Above we can see that this is a Cisco router which has 2 FastEthernet interfaces and 2 Serial interfaces. It also tells us how much RAM this router has and how big the compact flash memory is. It might take a few minutes for the router to reload. Routers have an IP address on each interface that they have.

We also have a serial interface. As explained in the introduction to WANs lessona serial interface might require a clock rate. If you connect two routers back-to-back with serial links then the DCE side requires a clock rate.

An alternative command that gives you a similar result is the show protocols command:. This router now has two active interfaces with IP addresses. You have now learned what the boot process of a Cisco IOS router looks like and how to erase the startup configuration so that you can start with a blank configuration.

We have also seen how to check what interfaces this router has, and how to configure IP addresses on each interface. Now I understand your question. Remove it first and then you can set a password. We will need more information. What IP are you trying to reach on the switch? What IP are you making the connection from? What are the details of your access-list 23?

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