Mechanisms for safely abandoning loop-free convergence (AAH)

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Last updated 2008-10-31
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IPFRR and loop-free convergence techniques can deal with single topology change events, multiple correlated change events, and in some cases even certain uncorrelated events. However, in all cases there are events which cannot be dealt with and the mechanism needs to quickly revert to normal convergence. This is known as "Abandoning All Hope" (AAH). This document describes the nature of the problem, and various proposed mechanisms to deal with it.


Mike Shand (
Stewart Bryant (
Pierre Francois (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)