By its nature, data communications traffic is bursty. For example, the transmission of a World Wide Web (Web) page from a server to a browser occurs in one burst of intense activity, then the network becomes relatively quiet again. A major challenge facing network designers is how to size WAN pipes so that they can handle bursty traffic. If the lines are too large, the organization will pay for bandwidth it may never use. If the lines are too small, long transmission queues can develop, resulting in increased latency, unnecessarily retransmitted frames, dropped packets, slow response times, session timeouts, and poor performance. Bandwidth aggregation builds on Multilink Point-to-Point Protocol (PPP) (RFC 1717) to provide a network administrator with tremen-dous flexibility in defining link speeds.