It is believed one of the students involved in the fight was the same one pushed and kicked in a wheelie bin, according to the Herald-Sun.
The video shows the 15-year-old trying to back away from another student, inside a ring of others screaming at them to fight.
Pupils are seen yelling at the boy to "fight him" and "fight, fight" as he backs away and is pushed back into the ring.
One of the boys, most of whom are wearing Xavier blazers, yells "It's on for young and old."
A student told the Herald-Sun that up to 100 boys had forced the two to fight, giving them an ultimatum that they do so or be beaten up. He said the boy in both cases had been singled out.
"He has been the subject of some bullying, probably due to his size and being unable to defend himself," he said.
"He is the same one who was kicked in the bin.
"Bullying is rife at Xavier College. Students are regularly tormented by football jocks and such, but the school doesn't punish them as they want them playing in their sports teams on Saturday mornings."
It is believed the footage was taken in mid-2005.
But Xavier principal Chris McCabe told the paper that there were incidents in 2005 and 2006, but the school had since addressed bullying "and by and large that has been successful. The incidents are not prevalent any more".
Mr McCabe said all schools faced an enormous challenge dealing with cyber-bullying.
A Xavier College media release on Friday also said the school had learned of the wheelie bin incident two days later and investigated immediately. Five participants, and the boy who filmed it, were suspended.
However it said other footage aired on TV of a boy being dragged and kicked was a hoax.
But another story has emerged of a letter containing a bullet being sent to the home of a Xavier student by another boy at the Catholic college in 2005.
Xavier College fight club (Herald-Sun, 14/4/07)
Brawls filmed at elite school's fight club (The Australian, 14/4/07)
Xavier student sent bullet in the mail (The Age, 14/4/07)
Bully video a hoax: Xavier (The Age, 14/4/07)
LINKS (not necessarily endorsed by Church Resources)
Xavier College fight video (Herald-Sun) | Xavier College bullying video (YouTube)
Students suspended over mobile phone bullying incident (CathNews, 13/4/07)
Police seize Xavier college cannabis (CathNews, 12/4/07)
Catholic college in student drug bust (CathNews, 11/4/07)
16 Apr 2007