 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
n |
if
path breaks (hello messages, link-layer
|
|
|
|
acknowledgements),
upstream nodes propagate unsolicited
|
|
RREP
with higher sequence number and hop count of ¥ to
|
|
all
active upstream nodes
|
|
|
n |
according
to protocol, these RREPs get forwarded to other
|
|
|
|
active
nodes, eventually all active correspondents will be
|
|
|
|
informed
of link failure
|
|
|
n |
if
needed, correspondents can start establishment of new
|
|
|
|
route
by issuing RREQ with destination sequence number
|
|
|
|
one
higher than last known sequence number
|
|
|
|
– |
problem:
how to make “smart” decision as to whether route is still
|
|
|
needed?
|
|