<s>
ZHLS-GF	B-Protocol
(	O
Zone-Based	O
Hierarchical	O
Link	O
State	O
Routing	B-Protocol
Protocol	I-Protocol
with	O
Gateway	B-Application
Flooding	B-Protocol
)	O
is	O
a	O
hybrid	O
routing	B-Protocol
protocol	I-Protocol
for	O
computer	B-Architecture
networks	I-Architecture
that	O
is	O
based	O
on	O
ZHLS	O
.	O
</s>
<s>
In	O
ZHLS	O
,	O
all	O
network	O
nodes	O
construct	O
two	O
routing	B-Protocol
tables	I-Protocol
—	O
an	O
intra-zone	O
routing	B-Protocol
table	I-Protocol
and	O
an	O
inter-zone	O
routing	B-Protocol
table	I-Protocol
—	O
by	O
flooding	B-Protocol
NodeLSPs	O
within	O
the	O
zone	O
and	O
ZoneLSPs	O
throughout	O
the	O
network	O
.	O
</s>
<s>
In	O
ZHLS-GF	B-Protocol
,	O
the	O
flooding	B-Protocol
scheme	O
floods	O
ZoneLSPs	O
only	O
to	O
the	O
gateway	B-Application
nodes	O
of	O
zones	O
,	O
thus	O
reducing	O
the	O
communication	O
overhead	O
significantly	O
.	O
</s>
<s>
Further	O
,	O
in	O
ZHLS-GF	B-Protocol
only	O
the	O
gateway	B-Application
nodes	O
store	O
ZoneLSPs	O
and	O
constructs	O
inter-zone	O
routing	B-Protocol
tables	I-Protocol
,	O
meaning	O
that	O
the	O
total	O
storage	O
capacity	O
required	O
in	O
the	O
network	O
is	O
less	O
than	O
in	O
ZHLS	O
.	O
</s>
