No. In the Employer Nomination Scheme (ENS), if you can observe there are 2 options available as soon as you are living and working in Australia to renovate your 457 visa to PR as follows:
Choice 1:
Get a Skills Assessment and exhibit you have had as a minimum 3 years full-time work experience in the job for which you will be paid off. The work familiarity can be in Australia or abroad.
Choice 2:
Work full time for 2 years on a subclass 457 in your listed occupation with the sponsoring company. The 2 year period leave out any periods of unpaid leave or working on other visas.