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Software bugs in routers lead to network outages, security vulnerabilities, and other unexpected behavior. Rather than simply crashing the router, bugs can violate protocol semantics, rendering traditional failure detection and recovery techniques ineffective. Handling router bugs is an increasingly important problem as new applications demand higher availability, and networks become better at dealing with traditional failures. In this paper, the authors tailor Software and Data Diversity (SDD) to the unique properties of routing protocols, so as to avoid buggy behavior at run time. The bug-tolerant router executes multiple diverse instances of routing software, and uses voting to determine the output to publish to the forwarding table, or to advertise to neighbors.
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