Hi
It seems you have mixed two concepts of trunking.
First way, if the interface is in mode "switchport"
Then you have to configure the layer2 vlan with command " vlan 70"
after that you configure the layer3 with command " interface vlan 70" here you add your ip address.
and then you configure the interface where you will connect the pc with commands "switchport mode access" and "switchport access vlan 70" if you want the port not to send dot1q tags, or you configure "switchport mode trunk" and "switchport trunk allowed vlan 70" if you want to send traffic with dot1q.
Second way, if the interface is in "no switchport"
Then you configure the interface directly with command
interface gi2/.70
encap dot1q
ip address x.x.x.x
/Mikael