Manager Ralph Hasenhuettl said 10-man RB Leipzig was taught a "tough lesson" as leader Bayern Munich hammered its nearest Bundesliga rival 3-0 on Wednesday.

Bayern coach Carlo Ancelotti hailed a "perfect" opening 30 minutes in which Thiago Alcantara and Xabi Alonso netted early goals before Leipzig winger Emil Forsberg was shown a red card for a dangerous tackle.

The sending-off steepened the visitor's already uphill task in the top-of-the-standings clash at Allianz Arena.