The victory sets up a semi-final clash with the Stormers next weekend.
Leinster booked their place in the United Rugby Championship semi-finals with a commanding 59-10 victory over the Lions at the Aviva Stadium.
Kildare's Sam Prendergast played a leading role in the win, scoring a second-half try and adding seven conversions in an impressive 19-point haul.
The out-half controlled proceedings throughout as Leinster bounced back strongly from last weekend's Champions Cup disappointment.
Fellow Kildare man Jimmy O'Brien also got on the scoresheet, crossing in the second half after another lively display in the Leinster backline.
James Lowe stole the headlines on his 100th appearance for the province, scoring twice to become Leinster's all-time leading try scorer with 71 tries.
The victory sets up a semi-final clash with the Stormers next weekend.

Wales Stun All Blacks To End 73-Year Wait For Victory
Ireland Face Must-Win Kosovo Clash After Narrow Defeat To Austria
Kildare Trio Feature As Ireland Overcome Fiji In Nations Championship
Kildare's Sean O'Haire Kicks Dramatic Last-Minute Winner In American College Football
Sunday Morning Sports Update
Milltown Through To Leinster Intermediate Semi-Finals After Victory Over Meath Champions
Sarsfields Leinster Championship Campaign Ends After Heavy Defeat To Cuala
More Than 20 Horses Withdrawn At Cheltenham Over Ground Conditions