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 |