Routing optimization for IP networks with loop-free alternates

摘要

Loop-free alternates (LFAs) have been developed for fast reroute (FRR) in intradomain IP networks. They are simple, standardized, and already offered by several vendors. However, LFAs have two major drawbacks. They often cannot provide failure protection against all single link or node failures in spite of physical connectedness, and some LFAs cause routing loops in scenarios with node or multiple failures.