I need to specify both frontend and beckend VLAN ids but there is only one attribute for public_vlan in the create_instance function. How do I specify both?
You need to specify public and private vlans, public is for frontend and privated for backend:
see documentation about the method: https://softlayer-api-python-client.readthedocs.io/en/latest/api/managers/vs/#SoftLayer.managers.vs.VSManager.create_instance
Regards