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Just about all Cisco products make use of Cisco IOS to operate and Cisco CLI to be managed. The fundamental CLI commands for those of them are actually the same, which simplifies Cisco unit control. Here are the command Cisco cheat sheet which identifies the fundamental instructions for configuring, troubleshooting, and securing Cisco network equipment.

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Fundamental Configuration Commands

Command 

Purpose

enable Logs you within enable mode, and that is likewise recognized as user exec mode as well as a privileged mode
configure terminal Logs you into configuration mode
interface fastethernet/number Enters interface configuration mode for the specified swiftly ethernet interface
reload An exec mode command which reboots a Cisco switch or even router
hostname name Sets a hostname to the current Cisco network device
copy from-location to-location An enable mode command that copies files from one file location to another
copy running-config startup-config An enable mode command that saves the active config, replacing the startup config when a Cisco network device initializes
copy startup-config running-config An enable mode command that merges the startup config with the currently active config in RAM
write erase

erase startup-config

An enable method command which deletes the startup config
ip address ip-address mask Assigns an IP address and a subnet mask
shutdown

no shutdown

Used in interface configuration mode. “Shutdown” shuts down the interface, while “no shutdown” brings up the interface.
ip default-gateway ip_address Sets up the default gateway on a Cisco device
show running-config An enable mode command that displays the current configuration
description name-string A config interface command to describe or name an user interface
show running-config interface slot/number An enable mode command to display the running configuration for a specific interface
show ip interface [type number] Displays the usability condition of interfaces that are set up for IP
ip name-server serverip-1 serverip-2 A configure method command which sets the IP addresses of DNS servers

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Troubleshooting Commands

ping {hostname | system-address} [source source-address] Used in enable mode to diagnose simple network connectivity
speed {10 | 100 | 1000 | auto} A user interface mode command which physically sets the pace to the specified worth or even negotiates it automatically
duplex {auto | full | half} A user interface mode command which physically sets duplex to half, full, or even auto
cdp run

no cdp run

A configuration mode command which allows or maybe disables Cisco Discovery Protocol (CDP) for the device
show mac address-table Displays the MAC address table
show cdp This shows whether CDP is actually enabled globally
show cdp neighbors[detail] Lists summary info about each neighbor hooked up to this particular device; the “detail” alternative lists detailed info about each neighbor
show interfaces Displays detailed information about interface status, settings and counters
show interface status Displays detailed info about interface status, counters & adjustments
show interfaces switchport Displays the interface line condition show interfaces switchport Displays a big range of configuration options and present operational status, such as VLAN trunking information.
show interfaces trunk Lists information about the currently operational trunks and the VLANs supported by those trunks
show vlan

show vlan brief

Lists each VLAN as well as just interfaces assigned to that VLAN but doesn’t include trunks
show vtp status Lists the present VTP status, like the present mode

 

Routing and VLAN Commands

ip routenetwork-number network-mask {ip-address | interface} Sets a static route in the IP routing table
router rip Enables a Routing Information Protocol (RIP) routing procedure, which places you in router configuration mode
network ip-address In router configuration mode, associates a network with a RIP routing process
version 2 In router configuration mode, configures the software program to receive as well as send just RIP edition two packets
no auto-summary In router configuration mode, disables automatic summarization
default-information originate In router configuration mode, generates a default route into RIP
passive-interface interface In router configuration mode, sets only that interface to passive RIP mode. In passive RIP mode, RIP routing updates are accepted by, but not sent out of, the specified interface.
show ip rip database Displays the contents of the RIP routing database
ip nat [inside | outside] An interface configuration mode command to designate that traffic originating from or destined for the interface is subject to NAT
ip nat inside source {list{access-list-number | access-list-name}} interface type number[overload] A configuration mode command to establish dynamic source translation. Use of the “list” keyword enables you to use an ACL to identify the traffic that will be subject to NAT. The “overload” option enables the router to use one global address for many local addresses.
ip nat inside source static local-ip global-ip A configuration mode command to establish a static translation between an inside local address and an inside global address
vlan Creates a VLAN and enters VLAN configuration mode for further definitions
switchport access vlan Sets the VLAN that the interface belongs to.
switchport trunk encapsulation dot1q Specifies 802.1Q encapsulation on the trunk link.
switchport access Assigns this port to a VLAN
vlan vlan-id [name vlan-name] Configures a specific VLAN name (1 to 32 characters)
switchport mode { access | trunk } Configures the VLAN membership mode of a port. 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.
switchport trunk {encapsulation { dot1q } Sets the trunk characteristics when the interface is in trunking mode. In this mode, the switch supports simultaneous tagged and untagged traffic on a port.
encapsulation dot1q vlan-id A configuration mode command that defines the matching criteria to map 802.1Q frames ingress on an interface to the appropriate service instance

DHCP Commands

ip address dhcp A configuration mode command to acquire an IP address on an interface via DHCP
ip dhcp pool name A configuration mode command to configure a DHCP address pool on a DHCP server and enter DHCP pool configuration mode
domain-name domain Used in DHCP pool configuration mode to specify the domain name for a DHCP client
network network-number [mask] Used in DHCP pool configuration mode to configure the network number and mask for a DHCP address pool primary or secondary subnet on a Cisco IOS DHCP server
ip dhcp excluded-address ip-address [last-ip-address] A configuration mode command to specify IP addresses that a DHCP server should not assign to DHCP clients
ip helper-address address An interface configuration mode command to enable forwarding of UDP broadcasts, including BOOTP, received on an interface
default-router address[address2 … address8] Used in DHCP pool configuration mode to specify the default router list for a DHCP client

Security Commands

password pass-value Lists the password that is required if the login command (with no other parameters) is configured
username name password pass-value A global command that defines one of the possibly multiple user names and associated passwords used for user authentication. It is used when the login local line configuration command has been used.
enable password pass-value A configuration mode command that defines the password required when using the enable command
enable secret pass-value A configuration mode command that sets this Cisco device password that is required for any user to enter enable mode
service password-encryption A configuration mode command that directs the Cisco IOS software to encrypt the passwords, CHAP secrets, and similar data saved in its configuration file
IP domain-name name Configures a DNS domain name
crypto key generate rsa A configuration mode command that creates and stores (in a hidden location in flash memory) the keys that are required by SSH
transport input {telnet | ssh} Used in vty line configuration mode, defines whether Telnet or SSH access is allowed into this switch. Both values can be specified in a single command to allow both Telnet and SSH access (default settings).
access-list access-list-number {deny | permit} source [source-wildcard] [log] A configuration mode command that defines a standard IP access list
access-class Restricts incoming and outgoing connections between a particular vty (into a basic Cisco device) and the addresses in an access list
ip access-list {standard | extended} {access-list-name | access-list-number} A configuration mode command that defines an IP access list by name or number
permit source [source-wildcard] Used in ACL configuration mode to set conditions to allow a packet to pass a named IP ACL. To remove a permit condition from an ACL, use the “no” form of this command.
deny source [source-wildcard] Used in ACL configuration mode to set conditions in a named IP ACL that will deny packets. To remove a deny condition from an ACL, use the “no” form of this command.
ntp peer <ip-address> Used in global configuration mode to configure the software clock to synchronize a peer or to be synchronized by a peer
switchport port-security Used in interface configuration mode to enable port security on the interface

Monitoring and Logging

Commands

logging ip address Configures the IP address of the host that will receive the system logging (Syslog) messages
logging trap level Used in configuration mode to limit messages that are logged to the Syslog servers based on severity. Specify the number or name of the desired severity level at which messages should be logged.
show logging Enable mode command that displays the state of system logging (Syslog) and the contents of the standard system logging buffer.
terminal monitor An enable mode command that tells Cisco IOS to send a copy of all Syslog messages, including debug messages, to the Telnet or SSH user who issues this command

 

Conclusion

The Cisco IOS CLI is actually the primary user interface for configuring, maintaining, and troubleshooting most Cisco products. By this particular user interface, you are able to immediately perform each Cisco IOS command, and it does not matter the way you achieve the Cisco IOS platform; you are able to enter some CLI command from a remote, console, or maybe a terminal screen.

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Last modified: October 28, 2021

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