An inherently anomaly-free iBGP architecture

摘要

Especially for large Network Operators (NOs), eliminating routing anomalies is an important aspect for the internal BGP design. To avoid such unwanted effects, classical architectures [1], [2], [3] have need of certain restrictions kept in both, the network design and the iBGP peering. However, these restrictions are in conflict with the optimized network designs NOs seek. In this study we develop an inherently anomaly-free iBGP architecture that takes the demands of NOs into account. It is based on a central server that guarantees consistent local views in the entire system. This is done by exchanging additional routing information with the Border Routers of the Autonomous System. The architecture implements the results of iBGP analyses made in [4]. Despite not being that as flexible as classical information reduction techniques, our design scales equal or better in practice. All required protocol extensions are supported by IETF Internet Drafts from persons affiliated with important router vendors.