<s>
Fisheye	B-Protocol
State	I-Protocol
Routing	I-Protocol
(	O
FSR	O
)	O
is	O
a	O
proposal	O
for	O
an	O
implicit	O
hierarchical	O
routing	B-Protocol
protocol	I-Protocol
targeted	O
to	O
ad	B-General_Concept
hoc	I-General_Concept
networks	I-General_Concept
.	O
</s>
<s>
The	O
basic	O
principles	O
of	O
FSR	O
are	O
shared	O
with	O
other	O
proactive	O
,	O
link-state	O
routing	B-Protocol
protocols	I-Protocol
.	O
</s>
<s>
Fisheye	O
represents	O
a	O
valid	O
trade-off	O
between	O
the	O
accuracy	O
of	O
the	O
routing	O
function	O
and	O
the	O
overhead	O
due	O
to	O
the	O
generation	O
of	O
control	O
messages	O
by	O
the	O
routing	B-Protocol
protocol	I-Protocol
.	O
</s>
<s>
FSR	O
was	O
never	O
released	O
to	O
the	O
public	O
as	O
a	O
stand-alone	O
routing	B-Protocol
protocol	I-Protocol
,	O
and	O
its	O
specification	O
was	O
never	O
finalized	O
.	O
</s>
<s>
The	O
base	O
principle	O
was	O
included	O
in	O
the	O
widely	O
used	O
OLSRd	B-Protocol
daemon	O
(	O
an	O
open	O
source	O
implementation	O
of	O
the	O
OLSR	B-Protocol
routing	B-Protocol
protocol	I-Protocol
)	O
.	O
</s>
<s>
FSR	O
is	O
a	O
link-state	O
routing	B-Protocol
protocol	I-Protocol
,	O
thus	O
it	O
is	O
made	O
of	O
three	O
tasks	O
:	O
</s>
<s>
Route	O
Computation	O
:	O
from	O
the	O
information	O
contained	O
in	O
the	O
LSA	O
messages	O
the	O
node	O
can	O
reconstruct	O
the	O
whole	O
network	O
topology	O
and	O
use	O
Dijkstra	B-Algorithm
's	I-Algorithm
algorithm	I-Algorithm
to	O
compute	O
the	O
routes	O
to	O
any	O
node	O
in	O
the	O
network	O
.	O
</s>
<s>
The	O
peculiarity	O
of	O
FSR	O
is	O
that	O
LSA	O
messages	O
are	O
generated	O
every	O
Δ	O
seconds	O
using	O
a	O
sequence	O
of	O
distinct	O
Time-To-Live	B-Protocol
(	O
TTL	O
)	O
values	O
.	O
</s>
