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DRA821U: How to add VLAN interface permanently

Part Number: DRA821U

Dear expert, 

we can add vlan when the board powered on with following command, and vlan is working. 

vconfig add eth0 11

ifconfig eth0.11 172.17.1.2 netmask 255.255.255.0 up

Then we add below config to /etc/network/interfaces

auto eth0.11
iface eth0.11 inet static

add below config to /etc/systemd/network/11-eth0-vlan11.network

[Match]
Name=eth0.11

[Network]
Address=172.17.1.2
Broadcast=172.17.1.255
Netmask=255.255.255.0

after power cycle the board, there is no vlan interface if we perform ifconfig command

seems the /etc/network/interfaces not working, how could I add VLAN permanently?