Leo Cullen’s men scored eight tries on the way to a comprehensive 57-3 win over Montpellier on Friday night at the RDS Arena.
The win secured top spot in the pool and a place in the Champions Cup quarter-finals.
Leinster travel to face Castres in Stade Pierre Antoine this Friday (KO 7.45pm Irish time) knowing a win will guarantee a home quarter-final.
HIGHLIGHTS: Watch @LeinsterRugby book their place in the knockout stage with an emphatic home victory #ChampionsCup pic.twitter.com/QlAg6gi6hq
— Champions Cup (@ChampionsCup) January 14, 2017