Leinster have beaten Zebre 20-3 at Stadio XXV Aprile in Parma.
Ian Madigan managed a try, conversion and brace of penalties for Leinster. Luke McGrath added a second half try, converted by Jimmy Gopperth.
Leinster will next face Wasps in the Champions Cup at the RDS on 26th October.
Meanwhile, Ulster have home advantage as they play host to an unbeaten Glasgow Warriors side at Kingspan Stadium.
At Murrayfield, tries from Dougie Fife and Tim Visser have helped Edinburgh to a 24-10 win over Dragons.
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