You create 3 VLAN separately.Then you should return config interface that you want eg. Top 10 ports have FA0 / 1, FA0 / 2, FA0 / 3, FA0 / 4 ... etc..
you must go into the config of each of these interfaces
Code:
Switch> enable
password
switch # conf
yes
Switch (config) # int FA0 / 1
Switch (config-if) # switchport mode access
Switch (config-if) # switchport access vlan 1
like that for your first 10 interfaces. You do the same things for the following 10 fa0/11, fa0/12 ... etc.. but instead of "switchport access vlan 1" puts "switchport access vlan 2". You again for the last four ports with "switchport access vlan 3" .
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