The post explains why using a route-map when redistributing routes between protocols (like RIPv2 into OSPF) is important: without one, a router will redistribute all routes indiscriminately, which can cause routing loops, security issues, or unintended route propagation. A route-map gives fine control over which prefixes are shared and allows modification of route attributes such as metrics, metric types, and tags before redistribution. The article walks through a lab topology where RIPv2 routes from one router are selectively redistributed into an OSPF domain using access lists and a route-map that sets different metrics for specific prefixes, demonstrating the configuration and the resulting routing table.
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