Reactive Encapsulation Mappings in HIDRA

Scott M. Marshall, John M. Bellardo, Daniel Nelson, and Bryan Clevenger

Keywords

Routing Protocols, IP based Networks, Internet Architectures, HIDRA

Abstract

Scalability analysis of the Internet has resulted in two main concerns: rapid growth of the forwarding table and BGP’s poor convergence properties when distributing hundreds of thousands of routes. HIDRA, a backward-compatible architecture designed with feasibility-of-implementation in mind, has been proposed as one solution to reduce the size of the default-free zone (DFZ) forwarding table. This work extends HIDRA, greatly reducing the num- ber of routes maintained by BGP, yet preserves a practical, incremental deployment strategy. The proposed protocol also provides end networks direct, finer-grained control over the distribution of packets flowing into their network and provides for efficient mobility support. The new mapping protocol is prototyped on a small network testbed and shown to work in all tested circumstances, including normal network operation, link failures, and transitional routing environments. Additionally, IP Mobility is discussed and shown to work in this environment without triangle routing and only minimal additional overhead.

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