Antnet is an agent based routing algorithm based on real ants' behavior. Ants are able to find shortest path to food source .In real life, ants drop some kind of chemical substances to mark the path that they used. Then on their way back they choose the path with the highest pheromones which becomes the shortest path. But Antnet Algorithms may cause the network congestion and stagnation. Here, M-shortest optimal paths are proposed with negligible overhead in spite of single optimal path in Antnet routing algorithm and consequently the load is distributed over those paths with some strategy.