<s>
A	O
provider	B-Protocol
edge	I-Protocol
router	I-Protocol
(	O
PE	B-Protocol
router	I-Protocol
)	O
is	O
a	O
router	B-Protocol
between	O
one	O
network	B-Architecture
service	O
provider	O
's	O
area	O
and	O
areas	O
administered	O
by	O
other	O
network	B-Architecture
providers	O
.	O
</s>
<s>
A	O
network	B-Architecture
provider	O
is	O
usually	O
an	O
Internet	O
service	O
provider	O
as	O
well	O
(	O
or	O
only	O
that	O
)	O
.	O
</s>
<s>
The	O
term	O
PE	B-Protocol
router	I-Protocol
covers	O
equipment	O
capable	O
of	O
a	O
broad	O
range	O
of	O
routing	B-Protocol
protocols	O
,	O
notably	O
:	O
</s>
<s>
PE	B-Protocol
routers	I-Protocol
do	O
not	O
need	O
to	O
be	O
aware	O
of	O
what	O
kind	O
of	O
traffic	O
is	O
coming	O
from	O
the	O
provider	O
's	O
network	B-Architecture
,	O
as	O
opposed	O
to	O
a	O
P	B-General_Concept
router	I-General_Concept
that	O
functions	O
as	O
a	O
transit	O
within	O
the	O
service	O
provider	O
's	O
network	B-Architecture
.	O
</s>
<s>
However	O
,	O
some	O
PE	B-Protocol
routers	I-Protocol
also	O
do	O
labelling	O
.	O
</s>
