Thomas Kunz
Systems and
Computer Engineering
16
Route
Reply in DSR
lRoute Reply
can be sent by reversing the route in Route Request (RREQ) only if links are guaranteed to be bi-directional
uTo ensure this, RREQ should be forwarded only if it
received on a link that
is known to be bi-directional
lIf
unidirectional (asymmetric) links are allowed, then RREP may need a route discovery for S from node D
uUnless
node D already knows a route to node S
uIf a route discovery is initiated by D for a route to S,
then the Route Reply is
piggybacked on the Route Request from
D.
lIf IEEE
802.11 MAC is used to send data, then links have to be bi-directional (since Ack is used)