This object classifies the nature of reachability for this route entry: other(1) if unspecified, reject(2) meaning matching traffic should be discarded as unreachable (useful for aggregating routes), internal(3) for routes within the local network, or exterior(4), the default, for routes to external networks. An admin sets reject(2) to explicitly black-hole a summarized but partially unreachable address range rather than leaving it unlisted. Leaving the default exterior(4) reflects a normal route to an outside network reachable via this node.