Subnet Design

Useful Packet Tracer Commands

• Enable: this command gives you elevated privileges when editing the switch, you will know you are in this mode when the > turns to a #
• Config terminal: This command allows you to enter configuration commands to edit interfaces, vlans, and just the settings of the swtich

Creating VLANs on a switch

• To create a VLAN on a switch you will need to be elevated to enable, once you are elevated use this command: vlan database
• vlan database: this will put you into a configuration for vlans
• To create a vlan use this command: vlan (number) name (name of vlan)

Setting Access and trunk ports on a switch

• For these commands to work you will need to select the specific port you want to change
• To do this, use the command: Interface FastEthernet0/x
• To change a port to an Access port use this command: switchport mode access
• switchport trunk encapsulation dot1q
• To change a port to a Trunk port use the command: switchport mode trunk

Configuring interfaces in "ranges"

• To configure interfaces in ranges use this command: (config)interface range FastEthernet 0/x-y
• (config-if-range)switchport access vlan x (defines the vlan for all ports in the range)

Enable Routing

• (config)ip routing (turns on routing on multilayer switches)

Setting an IP address for the Vlan

• (config)interface vlan 100 (brings you into vlan interface config mode)
• (config-if)ip address 10.25.100.1 255.255.255.0 (set the ip address of 10.25.100.1 for vlan 100 on a routing switch)
• NOTE: This only needs to be set on the router-switch acting as the gateway for the vlan