System Software Support for Router Fault Tolerance

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Executive Summary

Improvements to router reliability using the Generalized Algorithm of Fault Tolerance (GAFT) are presented using time, structure and information types of redundancy. Router functionality and options to tolerate faults are discussed and analyzed. Separation of toleration of malfunction and permanent faults is discussed in terms of their impact on system reliability. A scheme of reliability improvement for router is proposed using system software recovery points, with brief explanation of their implementation. Communication networks are made out of nodes and links. Both items include hardware and software components and are expected to provide communication through these networks in a reliable and transparent manner.

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