CCNA basic switch configuration commands sheet


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