This is an enumerated option, unspecified, readvertise, or no-readvertise, controlling whether an active managed route is eligible to be readvertised by other routing protocols running on this virtual router. Setting it to no-readvertise lets an admin keep a managed route usable locally without leaking it out to peers via another protocol. An admin adding a managed route purely for local policy reasons would set this to no-readvertise to prevent it from being redistributed into OSPF or RIP.