AODV: Route Table
n each entry has source and destination sequence numbers,
plus soft-state information:
route request expiration timer: when to delete reverse path entries
route caching timeout: when the expire an established route
(assuming that is has not been active)
active indicator: routes are considered active if node originates
and/or relays packet to destination within most recent
active_timeout interval
n update routing table if “fresher” or better routes become
available