The MAC already had deals to send teams to the Little Caesars Pizza Bowl in Detroit, the Famous Idaho Potato Bowl in Boise and GoDaddy Bowl in Mobile, Ala., plus status as a backup option for some of the ESPN-owned games.
The Sun Belt has deals with the New Orleans Bowl and GoDaddy.
The Sun Belt, which is undergoing another membership makeover in the next two seasons, sent Louisiana-Monroe into the Independence Bowl last season when that game didn't have a second eligible team with its contracted conference.
The six-year deal includes a $225,000 annual sponsorship from Montgomery, which will receive two or three TV ads per game, Mayor Todd Strange said.
Former Troy athletic director Johnny Williams will serve as executive director. He also ran the Raycom All-Star Classic, a game for NFL hopefuls that was played for the first time in January.