The Internet is a hierarchical architecture comprising heterogeneous entities of privately owned infrastructures, where higher level Internet Service Providers (ISPs) supply connectivity to the local ISPs and charge the local ISPs for the transit services. One of the challenging problems facing service providers is how to increase the profitability while maintaining good service qualities. The work discussed in this paper seeks to understand the fundamental issues on the "Interplay" (or interaction) between ISPs at different tiers. While the local ISPs (which the paper term peers) can communicate with each other by purchasing the connectivity from transit ISPs, there stands an opportunity for them to set up private peering relationships.
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