hierarchical routing


hierarchical routing

The complex problem of routing on large networks can besimplified by breaking a network into a hierarchy of smallernetworks, where each level is responsible for its own routing.The Internet has, basically, three levels: the backbones, themid-levels, and the stub networks. The backbones know how toroute between the mid-levels, the mid-levels know how to routebetween the sites, and each site (being an autonomous system)knows how to route internally. See also Exterior GatewayProtocol, Interior Gateway Protocol, transit network.