[1] Rekhter Y., and T. Li, "A Border Gateway Protocol 4 (BGP-4), RFC 1771, T.J. Watson Research Center, IBM Corp., cisco Systems, March 1995. [2] Braun, H-W., "Models of Policy Based Routing", RFC 1104, Merit/NSFNET, June 1989. [3] Fuller, V., Li, T., Yu, J., and K. Varadhan, "Supernetting: an Address Assignment and Aggregation Strategy", RFC1519, BARRNet, cisco, MERIT, OARnet, September 1993.