aws rds create-db-subnet-group
Creates a new DB subnet group. AWS CLI reference
4 options Its page in the AWS CLI reference
Options
--db-subnet-group-descriptionThe description for the DB subnet group.--db-subnet-group-nameThe name for the DB subnet group.--subnet-idsThe EC2 Subnet IDs for the DB subnet group.--tagsTags to assign to the DB subnet group.