Auto creation: If Default Route Table Association is enabled and the default association route table is specified, attachments are automatically associated with the default association route table.
Each attachment can only be associated with one route table. Associations between attachments in Association Overview are described as follows:
Auto creation: The system automatically associates attachments, such as VPC 1, VPC 2, and virtual gateway 1 attachments, with the default route table of the enterprise router.
Manual creation: You need to manually create associations in the custom route table of the enterprise router for attachments, such as VPC 3, VPC 4, and virtual gateway 2 attachments.