(i) the sequence number in the routing table is marked as
invalid in route table entry.
(ii) the Destination Sequence Number in the RREP is greater than
the node's copy of the destination sequence number and the
known value is valid, or
(iii) the sequence numbers are the same, but the route is is
marked as inactive, or
(iv) the sequence numbers are the same, and the New Hop Count is
smaller than the hop count in route table entry.