Munster moved top of Pro14's Conference A after capitalising on Glasgow Warriors' defeat to in-form Benetton Treviso.
For the second time in the Pro14 season, Ulster were beaten by Irish rivals Connacht.
Connacht scored four tries but still lost out to Leinster, who rallied from 17 points down to triumph in dramatic circumstances.
Tributes were paid to teenager Nicolas Chauvin before and after Stade Francais got the better of the Ospreys in Paris.
Alex Allan's dismissal did not prove costly as Glasgow Warriors beat the Scarlets, while Leinster scored 59 in a victory over the Dragons.
Jared Rosser scored two tries as the Dragons claimed a much-needed victory in Sunday's Pro14 action.
There were wins for Connacht and Ulster in Saturday's Pro14 action.
Zebre stunned Edinburgh, Scarlets denied Southern Kings and there was landmark win for Ulster in Pro14 on Friday.
Connacht had no answer to Chris Ashton, who enjoyed a hat-trick on his competitive debut for Sale Sharks.
Connacht finally secured an away derby win at Ulster, taking advantage of Matthew Rea's dismissal early in the second half.
Leinster's Pro14 title defence continued with a fourth win in five, with Glasgow Warriors and the Ospreys matching that return on Saturday.
The Southern Kings claimed a first Pro14 win of the season and consigned Glasgow Warriors to a first loss in Port Elizabeth.
Edinburgh saw off Connacht to record their first Pro 14 win as Munster thrashed a much-changed Ospreys side on Friday.
Pro14 champions Leinster were defeated by last season's runners-up Scarlets in a tense clash on Saturday.
John Cooney's kicking got Ulster up and running, while Connacht's Craig Ronaldson fell just short and Munster ran riot in Pro14.
After enduring a disappointing Pro14 season, Connacht have appointed Andy Friend to try and turn their fortunes around.