Tag-switching architecture: overview

Tag switching is based on two key ideas: (1) single forwarding algorithm based on label (tag) swapping, and (2) support for a wide range of forwarding granularities that could be associated with a single tag. Combination of these two ideas facilitates the development of a routing system that is functionally rich, scalable, suitable for high forwarding performance, and is capable of graceful evolution to address new and emerging requirements in a timely fashion.