A comment wrt Strategy C 's major criticism: What is hereby criticized is an allegeable inability for doing discriminating routing. Anyone being familiar with OSPF will admit that you may advertise individual links and individual nodes to "be not usable for transit". If this were too general, then of course it may take some more effort to advertise them "to be not usable (for transit) by well-specified packet flows". Will say: it is not a fundamental question whether this kind of economic model can be supported or not. However, multipath routes via more remote neighbors, are, fundamentally !!, disabled, if such a neighbor has at first received an UPDATE message from the current router, and has no reason to propagate a worse path to this current router. Here the economic model excludes a significant portion of multipath alternatives, which cannot be enabled without an enormous churn increase. Heiner
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