Cisco Express Forwarding-CEF-Load balancing is the act of distributing the load of a single connection or other service to multiple physical T1's. It offers lower cost, higher performance and reliability than having one large enterprise-scale server, but it is limited in the amount of bandwidth that can travel over the connection. A Load Balanced solution is necessary for MANY small requests for bandwidth. A good example is an office of 150 people in which they ALL are constantly downloading 1.5mb files or less. The Load Balanced solution will NEVER reach over 1.54M. It only allows more people to use the bandwidth.
MLPPP-"Multilink PPP (MLPPP) is a method of splitting, recombining, and sequencing data across multiple logical data links. LARGE FILES are actually split into BITS and sent evenly down ALL T1's to the carrier's edge router in which they are placed back together in the same order. This is done instantaneously with NO loss of bandwidth. It is important to understand that the carrier needs to use the same type of equipment and protocol on their end in order to recombine your data, and to split the data into packets coming to you in order to obtain the increased speed IN BOTH DIRECTIONS. "
