Kumar, Brijesh; (1993) Policy routing in internetworks. Doctoral thesis (Ph.D.), University College London (United Kingdom).

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Abstract

Inter-domain routing in internetworks is required to support policy-related requirements such as access rights, cost and route selection policies of participating domains. These policy requirements of domains are varied, and not all such requirements can be supported by currently deployed routing protocols. This has necessitated the development of a new generation of inter-domain routing protocols. This thesis represents one of the first in-depth studies of policy requirements and enforcement mechanisms. Policy requirements are systematically analysed and the administrative motivation for these policies examined. We have proposed Bilateral Policy Routing Protocol (BPRP), a new inter-domain routing protocol based on bilaterally defined policies, link state advertisement of topology information, and domain level source routing. Though BPRP can exist at its own, it is primarily aimed to complement the functionality of existing inter-domain routing protocols such as BGP and IDRP. We have also proposed a new scheme to augment the policy routing capabilities of existing inter-domain routing protocols (BGP/IDRP). Our scheme allows domains to obtain domain-level source routes on demand. These routes can then be used to forward data packets. In addition to proposing the design of a new inter-domain routing protocol and a new proposal to augment existing routing protocols, this thesis investigates three more areas relevant to policy routing. These are—accounting of networking resources and its impact on internetwork routing, scalability of inter-domain routing protocols, and the integration of security in internetwork routing. Various possible accounting models and their impact on internetwork routing are discussed. A detailed study of the scalability of all major inter-domain routing protocols has been carried out and the results examined. Security requirements of inter-domain routing protocols are analysed. Using this analysis, the design of secure inter-domain routing protocols is presented, and the performance implications of new security measures evaluated.

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