Munster handed new head coach Rob Penney his first Thomond Park win as they got the better of Benetton Treviso.
Team captain Doug Howlett dashed through for a fifth-minute try in response to Alberto di Bernado's opening penalty and Munster foraged into a 16-3 lead by the break.
But that proved to be the only try of the game as Ian Keatley, who finished with 14 points and the man-of-the-match award, and Di Bernardo kicked a penalty apiece in the second half.
Treviso were fresh from humbling reigning champions Ospreys 12-6 in round one but never looked likely to come out on top in Ireland.
Connacht on top of Zebre
TIERNAN O'Halloran, George Naoupu and Mike McCarthy all touched down as Connacht opened their RaboDirect PRO12 win account in humid conditions in Parma against Zebre.
The Westerners were 13-0 up at half-time thanks to O'Halloran's try and the boot of Miah Nikora.
Samuele Pace hit back with a try for the hosts but Nikora's accuracy and Nauopa's try kept them at bay.
South African Andries van Schalkwyk rumbled over for their second converted try but Mike McCarthy made sure of a 30-17 win with an opportunist touchdown.