<s>
In	O
telecommunications	O
,	O
Multiprotocol	B-Protocol
Label	I-Protocol
Switching	I-Protocol
-	O
Transport	O
Profile	O
(	O
MPLS-TP	B-Protocol
)	O
is	O
a	O
variant	O
of	O
the	O
MPLS	B-Protocol
protocol	O
that	O
is	O
used	O
in	O
packet	O
switched	O
data	O
networks	O
.	O
</s>
<s>
MPLS-TP	B-Protocol
is	O
the	O
product	O
of	O
a	O
joint	O
Internet	O
Engineering	O
Task	O
Force	O
(	O
IETF	O
)	O
/	O
International	O
Telecommunication	O
Union	O
Telecommunication	O
Standardization	O
Sector	O
(	O
ITU-T	O
)	O
effort	O
to	O
include	O
an	O
MPLS	B-Protocol
Transport	O
Profile	O
within	O
the	O
IETF	O
MPLS	B-Protocol
and	O
PWE3	O
architectures	O
to	O
support	O
the	O
capabilities	O
and	O
functionalities	O
of	O
a	O
packet	O
transport	O
network	O
.	O
</s>
<s>
MPLS-TP	B-Protocol
is	O
designed	O
for	O
use	O
as	O
a	O
network	O
layer	O
technology	O
in	O
transport	O
networks	O
.	O
</s>
<s>
It	O
will	O
be	O
a	O
continuation	O
of	O
the	O
work	O
started	O
by	O
the	O
transport	O
network	O
experts	O
of	O
the	O
ITU-T	O
,	O
specifically	O
SG15	O
,	O
as	O
T-MPLS	B-Protocol
.	O
</s>
<s>
The	O
required	O
protocol	O
extensions	O
to	O
MPLS	B-Protocol
being	O
designed	O
by	O
the	O
IETF	O
based	O
on	O
requirements	O
provided	O
by	O
service	O
providers	O
.	O
</s>
<s>
It	O
will	O
offer	O
a	O
dedicated	O
MPLS	B-Protocol
implementation	O
by	O
removing	O
features	O
that	O
are	O
not	O
relevant	O
to	O
CO-PS	O
applications	O
and	O
adding	O
mechanisms	O
that	O
provide	O
support	O
of	O
critical	O
transport	O
functionality	O
.	O
</s>
<s>
MPLS-TP	B-Protocol
is	O
to	O
be	O
based	O
on	O
the	O
same	O
architectural	O
principles	O
of	O
layered	O
networking	O
that	O
are	O
used	O
in	O
longstanding	O
transport	O
network	O
technologies	O
like	O
SDH	B-Protocol
,	O
SONET	B-Protocol
and	O
OTN	B-Protocol
.	O
</s>
<s>
MPLS-TP	B-Protocol
gives	O
service	O
providers	O
a	O
reliable	O
packet-based	O
technology	O
that	O
is	O
based	O
upon	O
circuit-based	O
transport	O
networking	O
,	O
and	O
thus	O
is	O
expected	O
to	O
align	O
with	O
current	O
organizational	O
processes	O
and	O
large-scale	O
work	O
procedures	O
similar	O
to	O
other	O
packet	O
transport	O
technologies	O
.	O
</s>
<s>
MPLS-TP	B-Protocol
is	O
a	O
low	O
cost	O
L2.5	O
technology	O
(	O
if	O
the	O
limited	O
profile	O
to	O
be	O
specified	O
is	O
implemented	O
in	O
isolation	O
)	O
that	O
provides	O
QoS	O
,	O
end-to-end	O
OA&M	B-Architecture
and	O
protection	O
switching	O
.	O
</s>
<s>
on	O
the	O
design	O
of	O
MPLS-TP	B-Protocol
.	O
</s>
<s>
ITU-T	O
in	O
turn	O
will	O
update	O
the	O
existing	O
T-MPLS	B-Protocol
standards	O
based	O
on	O
the	O
MPLS-TP	B-Protocol
related	O
RFCs	O
listed	O
below	O
.	O
</s>
<s>
The	O
following	O
ITU-T	O
Recommendations	O
exist	O
for	O
MPLS-TP	B-Protocol
.	O
</s>
<s>
Some	O
of	O
those	O
Recommendations	O
are	O
superseding	O
the	O
ones	O
that	O
applied	O
to	O
T-MPLS	B-Protocol
before	O
this	O
work	O
was	O
ceased	O
.	O
</s>
<s>
The	O
following	O
IETF	O
RFCs	O
or	O
drafts	O
exist	O
for	O
MPLS-TP	B-Protocol
:	O
</s>
