Hierarchical Routing Architecture (HRA)

Some recent research activities from IETF and IRTF Routing Research Group (RRG) are to explore a new routing and addressing architecture to meet those challenges that current Internet are facing, especially in scalability. An identifier/locator split idea has been widely recognized as an architectural solution to the routing scalability issue. This paper describes a new routing and addressing architecture, called as Hierarchical Routing Architecture (HRA). HRA is also a kind of id/locator split solution. It introduces a hierarchical and cryptographic host identifier and adopts a hierarchical routing mechanism to support routing across multiple independent address spaces.