Multiple VLN Configuration Diagram:
Let assume that your incoming interface called ether1. Then you need:
/interface vlan add disabled=no vlan-id=20 interface=ether1 name=vlan20
/interface vlan add disabled=no vlan-id=30 interface=ether1 name=vlan30
If you put ether1 to the bridge you must specify that bridge as value of “interface” instead. If something is not working after this then check if vlans that coming to you is really properly configured.