CCNA basic switch configuration commands

On January 14, 2012 by TechTips

Cisco basic configuration commands (CCNA)

Command	descriptions
*switch>?*	The ? works here the same as in a router Used to get the list of all available commands
*switch>enable*	User mode, same as a router
*switch#*	Privileged mode
*switch#disable*	Leaves privileged mode
*switch>exit*	Leaves user mode
*switch#show version*	Displays information about software and hardware.
*switch#show flash:*	Displays information about flash memory (will work only for the 2900/2950 series).
*switch#show mac-address-table*	Displays the current MAC address forwarding table.
*switch#show running-config*	Displays the current configuration in DRAM.
*switch#show startup-config*	Displays the current configuration in NVRAM.
*switch#show vlan*	Displays the current VLAN configuration.
*switch#show interfaces*	Displays the interface configuration and status of line: up/up, up/down, admin down.
*switch#show interface vlan1*	Displays setting of virtual interface VLAN 1, the default VLAN on the switch.
To Reset Switch Configuration
*Switch#delete flash:vlan.dat*	Removes the VLAN database from flash memory.
*Delete filename [vlan.dat]?*	Press Enter
*Delete flash:vlan.dat? [confirm]*	Press Enter
*Switch#erase startup-config*	Erases the file from NVRAM.
*Switch#reload*	Restarts the switch.
To Set Host Names
*Switch#configure terminal*	Moves to global configuration mode
*Switch(config)#hostname Switch1*	Creates a locally significant host name of the switch. This is the same command as the router.
*Switch1(config)#*
To Set Passwords
*Switch(config)#enable password vinita*	Sets the enable password to vinita
*Switch(config)#enable secret nikki*	Sets the encrypted secret password to nikki
*Switch(config)#line console 0*	Enters line console mode
*Switch(config-line)#login*	Enables password checking
*Switch(config-line)#password vinita*	Sets the password to vinita
*Switch(config-line)#exit*	Exits line console mode
*Switch(config-line)#line vty 0 4*	Enters line vty mode for all five virtual ports
*Switch(config-line)#login*	Enables password checking
*Switch(config-line)#password vinita*	Sets the password to vinita
*Switch(config-line)#exit*	Exits line vty mode
*Switch(config)#*
To Set IP Addresses and Default Gateways
*Switch(config)#interface vlan1*	Enters the virtual interface for VLAN 1, the default VLAN on the switch
*Switch(config-if)#ip address 192.168.0.10 255.255.255.0*	Sets the IP address and netmask to allow for remote access to the switch
*Switch(config-if)#exit*
*Switch(config)#ip default-gateway 192.168.0.5*	Allows IP information an exit past the local network
To Set Interface Descriptions
*Switch(config)#interface fastethernet 0/1*	Enters interface configuration mode
*Switch(config-if)#description Finance VLAN*	Adds a description of the interface
To Set Duplex Operation
*Switch(config)#interface fastethernet 0/1*	Moves to interface configuration mode
*Switch(config-if)#duplex full*	Forces full-duplex operation
*Switch(config-if)#duplex auto*	Enables auto-duplex config
*Switch(config-if)#duplex half*	Forces half-duplex operation
To Set Operation Speed
*Switch(config)#interface fastethernet 0/1*
*Switch(config-if)#speed 10*	Forces 10-Mbps operation
*Switch(config-if)#speed 100*	Forces 100-Mbps operation
*Switch(config-if)#speed auto*	Enables autospeed configuration
MAC Address Table
*switch#show mac address-table*	Displays current MAC address forwarding table
*switch#clear mac address-table*	Deletes all entries from current MAC address forwarding table
*switch#clear mac address-table dynamic*	Deletes only dynamic entries from table