Top seed Cornish Pirates were ruled out as opposition after both sides met in the pool stages.
The quarter finals will take place on the weekend of Jan. 20th.
2011/12 British and Irish Cup Quarter Finals:
Cornish Pirates v Nottingham Rugby
Ulster Ravens v Munster A
Leinser A v Pontypridd
Cross Keys v Llanelli
Quarter-Final qualification process
5.2.2 - The six pool winners shall be ranked 1-6 and the runners-up shall then be ranked 7-12, in each case based on their playing record in the pool Stages using 5.2.1 (a)-(j). Those teams ranked 1-8 shall proceed to the quarter-finals.
5.3.3 - The draw for the quarter-final matches shall be made from the teams ranked 1-8 as set out in regulation 5.2.2. Those teams ranked 1-4 in accordance with 5.2.2 will have the home advantage. The draw will be organised by the Committee and will ensure that there are no fixtures that replicate the pool matches.