An advertised route learned from one protocol over a different protocol is called:

Co-location refers to housing an organization's servers in a third-party data center facility; it has no relation to routing protocol route exchange.

Reallocation is a general term for reassigning resources or addressing blocks and is not a defined networking or routing protocol concept.

Redundancy describes having duplicate systems or paths to ensure availability during failures; it does not describe the process of sharing routes between different routing protocols.

Redistribution takes routes advertised by one routing protocol (for example, OSPF routes) and injects them into a different routing protocol (for example, BGP or EIGRP) so that the receiving protocol can propagate those routes to its own peers. It is a fundamental technique for interconnecting networks that run different routing protocols or belong to different administrative domains.