Which term describes the sharing of routes learned by one routing protocol with another?

Route redistribution is the process that allows a routing protocol to share its learned routes with another routing protocol. This is essential in multi-protocol networks where different segments of the network may be running different routing protocols. For example, if one segment of the network is using OSPF and another is using EIGRP, route redistribution enables these two protocols to exchange routing information, ensuring that all routers in the network have a consistent view of the topology and can forward packets appropriately.

This capability is crucial for maintaining connectivity and optimizing routing decisions across diverse network environments. Without route redistribution, each routing protocol would operate independently, potentially leading to packet delivery issues as routers would not know how to reach networks they cannot directly communicate with.

In contrast, route summarization involves condensing multiple routes into a single advertisement to reduce the size of the routing table and keep the routing information efficient. Route aggregation is similar and is focused on combining IP addresses, typically within the same routing protocol, into a more general summary address. Route isolation refers to keeping routing information within a certain segment or autonomous system, which does not facilitate the sharing of routes between different protocols.