variables greatly influence the cost and therefore the

Scalability

Scalability is achieved in frame relay network design through the implementation of a hierarchy.
Using a hierarchy enables incremental growth. The hierarchical approach however, must follow
the three layer routing model in order for meeting high-availability, acceptable performance and
low-cost requirements. These requirements can be met through careful planning of actual
performance requirements at remote locations, degree of high-availability service, and minimizing
the complexity of the hierarchy.

Management

Managing a hierarchical network is minimized through the partitioning of the network into smaller elements. By simplifying the network into manageable modules, troubleshooting is eased. The partitioning also provides protection against broadcast storms and routing loops. A hierarchical design inherently provides a flexible network topology allowing the inclusion of other technologies into the network design. This leads to a hybrid approach for the overall network infrastructure. While hybrid network design may enable greater service, it does make network management a bit more complex. Finally, router management in hierarchical frame relay networks is reduced due to fewer network connections based on the hierarchy.