Towards End-to-End Quality-of-Service by Domain-Level Routing and Forwarding
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We propose to raise network domain to the first-class citizen in packet routing and forwarding. By making domain explicit in packet header, it can be held responsible for committed services and quality of service. Since the service is easier to be monitored, verified, and compensated, a new business model catering for emerging cross-domain, high-value, and performance-sensitive applications can be fostered. The domain-level routing and forwarding essentially create a L3.5 in the network protocol stack. We extend IPv6 with new routing headers to support two types of forwarding approaches. One is based on the next domain lookup and the other realizes the domain-level source routing. We describe various design details covering header format, forwarding behavior, routing protocol, DNS, and OAM. Several use cases are presented to demonstrate the scheme potential. The design is compatible with today's Internet architecture and incrementally deployable on existing infrastructure with only moderate updates needed. We expect the preliminary work can trigger more discussion and detailed design in the research and Internet standard communities.
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