A win at a noisy Stade Marcel Michelin would have seen Ulster top the pool and Morgan Parra and Ruan Pienaar both struck two penalties each as the sides went into the break tied at 6-6.

The pair traded penalties again before Pienaar put the visitors ahead again after 57 minutes.

But Ulster will be on the road in the quarter-finals for the second year in succession after Ti'i Paulo's try fifteen minutes from time gave Clermont a decisive advantage.

Pienaar brought Ulster back to within a point but Parra's final penalty ensured Clermont finish as table toppers with a better head-to-head record in terms of tries scored over the two matches played.

Clermont are unbeaten at home since November 2009 and they knew that only another victory would prevent them from failing to make the knockout stages for a second year in-a-row.

Ulster had beaten Clermont 16-11 at Ravenhill in November but the French side are a different proposition at home and they had Brian McLaughlin's men on the back foot inside the opening minute.

Sitiveni Sivivatu swept around two Ulstermen and found Aurelien Rougerie supporting on the right wing. With men over, a try looked certain but mercifully for the visitors the Clermont captain's difficult return pass was adjudged to be forward.

Sivivatu claimed to be impeded as he threatened down the right and former Leinster second row Nathan Hines was also close to getting through as Ulster struggled to hold on.

McLaughlin's charges finally got some respite when they swept to the opposite wing from a lineout but Andrew Trimble fumbled in a tight corner.

Momentum looked set to swing the home side's way again when Ulster, wearing red jerseys, were penalised and Parra took the penalty quickly. He was caught high by Dan Tuohy, and when the Ulster lock was sin-binned, Parra picked himself up to put Clermont ahead after 14 minutes.

Ulster captain Johann Muller was leading by example in the lineout, though, and when he was dragged to the ground illegally, his South African compatriot Pienaar levelled things up.

Parra punished another infringement at scrum-time to push the hosts in front again after 22 minutes but Ulster almost got a break when a wild pass by Rougerie was cut out by Craig Gilroy. A desperate tap tackle by prop Lionel Faure was enough to down the young Ulster winger.

Pienaar missed a difficult penalty attempt but he was given another chance after 32 minutes when Trimble was held up in the right corner. This time his strike was true.

Julien Malzieu's dangerous break was then stopped by Ulster full-back Stefan Terblanche and Pienaar missed another long distance penalty. Terblanche came up short with an audacious drop goal attempt as the sides went in level at the interval.

A huge push by the Ulster pack saw them win a penalty on a Clermont scrum as Pienaar put Ulster ahead for the first time, six minutes into the second half.

The home side responded by introducing Vincent Debaty and Brock James and they were rewarded instantly as Parra punished another Ulster infringement.

Pienaar kicked Ulster ahead again on 57 minutes but they had a real let off when Lee Byrne's try was ruled out after Hines obstructed both Stephen Ferris and Pedrie Wannenburg.

It proved a short reprieve as replacement hooker Paulo burrowed over following a sustained period of Clermont pressure on the Ulster line.

However, referee Dave Pearson and his assistants missed a blatant block by Hines on Chris Henry which made it easier for Paulo to rumble over.

Parra converted to put Clermont 16-12 in front with 15 minutes left. Pienaar replied but Parra got the final score with four minutes remaining, stretching Clermont's brilliant unbeaten record at home to 37 matches.

Speaking afterwards, Ulster head coach McLaughlin said: "We came here wanting to get a home quarter-final for our fans and I think that's why we're exceptionally disappointed because we felt in the first half we maybe had a couple of opportunities.

"We missed a couple of penalties - difficult as they were - but we had a couple of try-scoring opportunities which we left out there.

"When you're playing in a competition like this, exciting as it is and it's a brilliant competition, you just can't afford to do that."

He added: "What we wanted to do was back up last week, to show that we are proper contenders in this competition.

"Now what we've got to do, no matter where we go in the last-eight, we've got to turn in another performance. But it's got to better again because we are more than capable of going further in this competition."