Abstract: The multipath inter-domain routing is a complex topic, but profits of Internet Service Provider(ISP) are one of the most important factors for the prospect. We established an optimization model for profit of ISP based on the user's utilities. Then, the incensement of profit from singl}path routing to multipath routing and the impact of relevant factors were analyzed. Through theoretical analysis and simulation experiments,we found that ISP can acquire more profit when multipath routing was deployed. Moreover, it can offer better service for more users and delay sensitive traffics.

Key words: User utility, Multipath inter-domain routing, Profit of ISP