Cisco switch commands

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A large number of commands are available on Cisco routers , as well as many different protocols and features that can be used to establish a network. This section will familiarize you with some of the basic router commands that are commonly used, as well as some typical router management tasks in the included labs. The following commands are used to gather information on a Cisco IOS Software-based router when attempting to learn basic information about a router, or possibly troubleshooting protocol-independent problems: show version show running-config show interfaces show logging show tech-support Let's examine these commands further to see how they can be used to obtain valuable information. You will use the show version command in the simulation environment. This command displays the configuration of the system hardware, the software version, and the names and sources of configuration files and the boot images.

Cisco switch commands

It contains these sections:. The Cisco IOS user interface is divided into many different modes. The commands available to you depend on which mode you are currently in. Enter a question mark? When you start a session on the switch, you begin in user mode, often called user EXEC mode. Only a limited subset of the commands are available in user EXEC mode. For example, most of the user EXEC commands are one-time commands, such as show commands, which show the current configuration status, and clear commands, which clear counters or interfaces. The user EXEC commands are not saved when the switch reboots. To have access to all commands, you must enter privileged EXEC mode. Normally, you must enter a password to enter privileged EXEC mode. From this mode, you can enter any privileged EXEC command or enter global configuration mode. Using the configuration modes global, interface, and line , you can make changes to the running configuration.

Redisplays the current command line if the switch suddenly sends a message to your screen. Scroll down a line or screen on displays that are longer than the terminal screen can display. Without this password, cisco switch commands, anyone with console credentials will have the ability to configure the switch.

Have you recently tried configuring a Cisco switch, only to realize you've forgotten the commands? You're not alone; we all need a refresher once in a while -- so, here's your refresher course. Whether you are brand new to Cisco networking or a veteran with decades of experience, it's usually smart to memorize these fundamental Cisco switch commands. For this discussion, we'll be using PuTTY! Download the guide and refer back to it at any time! If you're needing to extend the life of your Cisco s while waiting for your Catalyst , , , or Series switches to arrive, PivIT supports these switches on our OneCall third-party maintenance offering. As you know, the switch is the heart of your network.

The Cisco IOS user interface is divided into many different modes. The commands available to you depend on which mode you are currently in. Enter a question mark? When you start a session, you begin in user mode, often called user EXEC mode. Only a limited subset of the commands are available in user EXEC mode.

Cisco switch commands

The CLI provides a command-driven environment where network administrators can enter commands to perform various configuration, monitoring, and troubleshooting tasks on Cisco switches. These functions include:. Since all ports on a switch are enabled by default, there is usually no IP address configured on its interfaces. The only reason we would set an IP address, mask, and default gateway is for management purposes. You would typically use the default VLAN 1 to manage a switch, as shown in the example below. If you want to manage your switches from outside your LAN, you need to set a default gateway on the switches, just as you would with a host. The default gateway is essentially the address of the router that the switch will be communicating with. You do this from a global config. To prevent unauthorized access to your LAN, it is usually advisable to identify and limit the MAC addresses of the workstations that are allowed to access the switch port. Port security is the tool that helps us achieve this.

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The software assumes you have a terminal screen that is 80 columns wide. This command displays the equivalent of the following show commands: show version show running-config show controllers show stacks show interfaces show buffers show processes memory show processes cpu The output of most of these commands is of use only to your technical support representative. Note Copies of the CMS pages that you display are saved in your browser memory cache until you exit the browser session. Interface configuration While in global configuration mode, enter the interface command with a specific interface. Ctrl-A Moves the cursor to the beginning of the command line. When this happens, the router will crash. Press Ctrl-N or the down arrow key. Although enhanced editing mode is automatically enabled, you can disable it. Global Configuration mode can be further divided into the following command modes, which permit you to configure different components: Interface configuration mode Subinterface configuration mode Router configuration mode Line configuration mode Mode Control Commands Command Description enable Moves a user from user exec mode into Privileged EXEC mode. Specify frequency of transmission of Cisco Discovery Protocol updates. It may be necessary to upgrade the memory if such an issue occurs. Use this mode to configure parameters that apply to the entire switch. To exit to global configuration mode, enter the exit command.

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When this happens, the router will crash. Switch config. Enable Cisco Discovery Protocol on an interface. This problem could be associated with an existing loopback interface. Both values can be specified in a single command to allow both Telnet and SSH access default settings. Tunnel Tunnel interface. Disable Cisco Discovery Protocol on an interface. Designate a particular keystroke as an executable command, perhaps as a shortcut. It contains these sections:. Catalyst switches allow you to configure several descriptive system parameters to ease in the administration of internetwork equipment.