Cisco commands

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The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language. This user interface allows you to directly and simply execute Cisco IOS commands, whether using a router console or terminal, or using remote access methods.

Cisco commands

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. This command also displays information about how the system was last started and how long the router has been running since that start. Sample output from the show version command follows:. This software has many different versions of the Cisco IOS Software, each of which supports a variety of features. The version of Cisco IOS Software on the router plays a major role in dictating the capabilities and services of the router. Router Uptime and System Restart The router uptime can be checked to make sure the router has been in continuous operation since it was last restarted. If the uptime is inconsistent with the last known router maintenance, the router may have restarted because of problems with the electrical circuit it is connected to, or because of problems with the router itself. The "System restarted by" line displays a log of how the system was last booted, whether by normal system startup or because of a system error. The following display is an example of a system error that is generally the result of an attempt by the router to access a nonexistent address: System restarted by bus error at PC 0xC4CA, address 0xC0C0 Interface Hardware Inventory The interface hardware inventory should include all interface processors installed in the router. If any interfaces that are installed in the router do not show up in the inventory, there may be hardware problems with the interface processor itself, or the router may be running a version of the Cisco IOS Software that does not support that interface type.

Normally, you must enter a password to enter privileged EXEC mode. Table describes the fields in the show fc srp target command output.

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. 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.

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. This command also displays information about how the system was last started and how long the router has been running since that start. Sample output from the show version command follows:.

Cisco commands

Cisco switches can be used as plug-and-play devices out of the box but they also offer an enormous amount of features. Although the main purpose of the switch is to provide inter-connectivity in Layer 2 for the connected devices of the network, there are myriad features and functionalities that can be configured on Cisco Switches. In the following Cisco Switch Commands Cheat Sheet, I have tried to include the most important and frequently-used CLI commands that Cisco professionals encounter in real world networks. I know that the list is not exhaustive but I believe that the most useful commands are included. Make sure to download the whole commands cheat sheet in PDF format below so you can print it or save it on your computer for future reference.

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To list keywords or arguments, enter a question mark? The show card-inventory defaults to show card-inventory all. Optional Displays statistical data of the transmissions that occur on IP addresses. Table lists and describes the fields in the linear-frd-info keyword output. Displays the last action you performed using the config fc srp it command on this initiator target. Administrative limit for the number of virtual lanes allowed to the link. For packet-oriented interfaces, the cumulative number of inbound packets that contained errors that prevented them from being delivered to a higher-layer protocol. Use this mode to Change terminal settings. Ctrl-L or Ctrl-R Redisplays the current command line if the switch suddenly sends a message to your screen. Indicates if the Server Switch can enforce partitions on transmitted packets. The example below shows the output of the show ip address-table command. Esc , Y. Node description string. World-wide port name WWPN of the target port that the initiator can access through the virtual port. If detailed parameter is used, information about all ports is displayed.

Cisco IOS is the backbone software that powers many of Cisco's network devices. For professionals working with these systems, knowing the right commands is crucial. This article provides a Cisco commands cheat sheet, outlining the most common Cisco IOS commands for configuring, securing and troubleshooting Cisco network equipment.

You can customize this feature to suit your needs. The interface and line protocol status output gives information related to the physical state of the interface the first part of the output and shows the state of messages at the data link level the second part of the output, following the comma. The summary comprises the subnet-manager prefix, the node GUID and type, and vendor identification. Displays False if you disable broadcast forwarding. The following example provides information about all VLANs. This command displays active and inactive ITLs. Size of the largest IP datagram which this port can receive and reassemble from incoming fragmented IP datagrams. Authentication success : Number of times the state machine received a Success message from the Authentication Server. Table lists and describes the fields in the show interface gateway command output. Changing the Command History Buffer Size By default, the switch records ten command lines in its history buffer. Nmber of transmitted Multicast packets. Normally, you must enter a password to enter privileged EXEC mode. Are you sure you want to continue? A count of frames for which the first transmission attempt on a particular interface is delayed because the medium is busy.