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OSPF Reverse Metric

This document specifies the extensions to OSPF that enables a router
to signal to its neighbor the metric that the neighbor should use
towards itself using link-local advertisement between them. The
signalling of this reverse metric, to be used on link(s) towards
itself, allows a router to influence the amount of traffic flowing
towards itself and in certain use-cases enables routers to maintain
symmetric metric on both sides of a link between them.