Provider-based addressing

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Internet RFC 1338 was a major paradigm shift to establish a provider-based addressing and a routing hierarchy. With the new RFC 1338-style provider-based supernetting, it was possible to create multiple hierarchical tiers and most tiers were envisioned to be internet service providers. Provider-based address space allocation was the new model, and BGP would evolve to BGP-4, incorporating the RFC 1338 paradigm. For this shift to occur, the technique for supernetting-subnetting the IP address space required a modification. This new feature was called Classless Inter-Domain Routing (CIDR). (Note that RFC 1338 was replaced by RFC 1519) [1].

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