OSPF [RFC2328] is a link-state intra-domain routing protocol used inIP networks. OSPF behavior over demand circuits is optimized in[RFC1793] to minimize the amount of overhead traffic. A part of OSPFdemand circuit extensions is the Hello suppression mechanism. Thistechnique allows a demand circuit to go down when no interestingtraffic is going through the link. However, it also introduces aproblem, where it becomes impossible to detect a OSPF-inactiveneighbor over such a link. This memo addresses the above problem bythe neighbor probing mechanism.
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