Route redistribution (RR) is becoming a critical tool in enterprise network operations. Like BGP, RR is prone to configuration errors, which may result in severe instabilities such as permanent routing loops and oscillations. In response, router vendors have put forth a set of recommendations on how to configure RR. However, the proposed guidelines are mainly derived from anecdotal experience and based on a limited range of parameters. Having not been subjected to systematic validation, their general effectiveness for preventing routing instabilities is largely unknown. This paper shows that the vendor recommendations do not completely eliminate routing instabilities and have severe limitations in terms of domain backup. It then presents a set of new guidelines with provable properties assuring safety, robustness, reachability, and domain backup. Configurations based on these guidelines allow routing domains of a network to safely exchange information and back up each other, thus increasing the robustness of the network against failures
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