<s>
An	O
exterior	B-Protocol
gateway	I-Protocol
protocol	I-Protocol
is	O
an	O
IP	B-Protocol
routing	I-Protocol
protocol	O
used	O
to	O
exchange	O
routing	B-Protocol
information	I-Protocol
between	O
autonomous	B-Architecture
systems	I-Architecture
.	O
</s>
<s>
Notable	O
exterior	B-Protocol
gateway	I-Protocol
protocols	I-Protocol
include	O
Exterior	B-Protocol
Gateway	I-Protocol
Protocol	I-Protocol
(	O
EGP	O
)	O
,	O
now	O
obsolete	O
,	O
and	O
Border	B-Protocol
Gateway	I-Protocol
Protocol	I-Protocol
(	O
BGP	B-Protocol
)	O
.	O
</s>
<s>
By	O
contrast	O
,	O
an	O
interior	B-Protocol
gateway	I-Protocol
protocol	I-Protocol
is	O
a	O
type	O
of	O
protocol	O
used	O
for	O
exchanging	O
routing	B-Protocol
information	I-Protocol
between	O
gateways	O
(	O
commonly	O
routers	B-Protocol
)	O
within	O
an	O
autonomous	B-Architecture
system	I-Architecture
(	O
for	O
example	O
,	O
a	O
system	O
of	O
corporate	O
local	B-General_Concept
area	I-General_Concept
networks	I-General_Concept
)	O
.	O
</s>
<s>
This	O
routing	B-Protocol
information	I-Protocol
can	O
then	O
be	O
used	O
to	O
route	O
network-level	O
protocols	O
like	O
IP	B-Protocol
.	O
</s>
