Các lệnh CCNA căn bản

CCNA basic switch configuration commands sheet

Commanddescriptions
switch>?The ? works here the same as in a router Used to get the list of all available commands
switch>enableUser mode, same as a router
switch#Privileged mode
switch#disableLeaves privileged mode
switch>exitLeaves user mode
switch#show versionDisplays 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-tableDisplays the current MAC address forwarding table
.
switch#show running-configDisplays the current configuration in DRAM.
switch#show startup-configDisplays the current configuration in NVRAM.
switch#show vlanDisplays the current VLAN configuration.
switch#show interfacesDisplays the interface configuration and status of line: up/up, up/down, admin down.
switch#show interface vlan1Displays setting of virtual interface VLAN 1, the default VLAN on the switch.
To Reset Switch Configuration
Switch#delete flash:vlan.datRemoves the VLAN database from flash memory.
Delete filename [vlan.dat]?Press Enter
Delete flash:vlan.dat? [confirm]Press Enter
Switch#erase startup-configErases the file from NVRAM.
Switch#reloadRestarts the switch.
To Set Host Names
Switch#configure terminalMoves to global configuration mode
Switch(config)#hostname Switch1Creates 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 vinitaSets the enable password to vinita
Switch(config)#enable secret nikkiSets the encrypted secret password to nikki
Switch(config)#line console 0Enters line console mode
Switch(config-line)#loginEnables password checking
Switch(config-line)#password vinitaSets the password to vinita
Switch(config-line)#exitExits line console mode
Switch(config-line)#line vty 0 4Enters line vty mode for all five virtual ports
Switch(config-line)#loginEnables password checking
Switch(config-line)#password vinitaSets the password to vinita
Switch(config-line)#exitExits line vty mode
Switch(config)#
To Set IP Addresses and Default Gateways
Switch(config)#interface vlan1Enters the virtual interface for VLAN 1, the default VLAN on the switch
Switch(config-if)#ip address 192.168.0.10 255.255.255.0Sets the IP address and netmask to allow for remote access to the switch
Switch(config-if)#exit
Switch(config)#ip default-gateway 192.168.0.5Allows IP information an exit past the local network
To Set Interface Descriptions
Switch(config)#interface fastethernet 0/1Enters interface configuration mode
Switch(config-if)#description Finance VLANAdds a description of the interface
To Set Duplex Operation
Switch(config)#interface fastethernet 0/1Moves to interface configuration mode
Switch(config-if)#duplex fullForces full-duplex operation
Switch(config-if)#duplex autoEnables auto-duplex config
Switch(config-if)#duplex halfForces half-duplex operation
To Set Operation Speed
Switch(config)#interface fastethernet 0/1
Switch(config-if)#speed 10Forces 10-Mbps operation
Switch(config-if)#speed 100Forces 100-Mbps operation
Switch(config-if)#speed autoEnables autospeed configuration
MAC Address Table
switch#show mac address-tableDisplays current MAC address forwarding table
switch#clear mac address-tableDeletes all entries from current MAC address forwarding table
switch#clear mac address-table dynamicDeletes only dynamic entries from table

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