<s>
The	O
Gateway-to-Gateway	B-Protocol
Protocol	I-Protocol
(	O
GGP	O
)	O
is	O
an	O
obsolete	O
protocol	O
defined	O
for	O
routing	B-Protocol
datagrams	B-Protocol
between	O
Internet	B-Application
gateways	I-Application
.	O
</s>
<s>
The	O
Gateway-to-Gateway	B-Protocol
Protocol	I-Protocol
was	O
designed	O
as	O
an	O
Internet	B-Protocol
Protocol	I-Protocol
(	O
IP	O
)	O
datagram	B-Protocol
service	I-Protocol
similar	O
to	O
the	O
Transmission	B-Protocol
Control	I-Protocol
Protocol	I-Protocol
(	O
TCP	O
)	O
and	O
the	O
User	B-Protocol
Datagram	I-Protocol
Protocol	I-Protocol
(	O
UDP	O
)	O
.	O
</s>
<s>
However	O
,	O
it	O
is	O
classified	O
as	O
an	O
Internet	B-Protocol
Layer	I-Protocol
protocol	O
.	O
</s>
<s>
A	O
router	O
is	O
defined	O
to	O
be	O
zero	O
hops	O
from	O
directly	O
connected	O
networks	O
,	O
one	O
hop	O
from	O
networks	O
that	O
are	O
reachable	O
through	O
one	O
other	O
gateway	B-Application
.	O
</s>
<s>
The	O
protocol	O
implements	O
a	O
distributed	O
shortest-path	O
methodology	O
,	O
and	O
therefore	O
requires	O
global	O
convergence	O
of	O
the	O
routing	B-Protocol
tables	O
after	O
any	O
change	O
of	O
link	O
connectivity	O
in	O
the	O
network	O
.	O
</s>
