how to create sub vlan interface on uc 560

[nflnetwork]

hello i have an older uc 560 router that is my default gateway. i would like to create an SVI . 

Cisco IOS Software, UC500 Software (UC500-ADVIPSERVICESK9-M), Version 15.1(4)M5, RELEASE SOFTWARE (fc1)

i created the vlan and gave it an ip address. it shows "down"

how do i apply this to an interface?

thx. 

[nflnetwork]

here is the current config of the trunk port where i would like to add vlan  20. 

I run this cmdlt but doesnt seem to change anything. 

switchport trunk allowed vlan add 20

UC_560#sh run interface gigabitEthernet 0/1/0
Building configuration...

Current configuration : 135 bytes
!
interface GigabitEthernet0/1/0
switchport mode trunk
switchport voice vlan 100
no ip address
macro description cisco-switch
end

UC_560#