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CCAMP WG - http://www.ietf.org/internet-drafts/draft-fontana-ccamp-gmpls-g709-00.txt
NAME OF I-D:
http://www.ietf.org/internet-drafts/draft-fontana-ccamp-gmpls-g709-00.txt
SUMMARY
Generalized MPLS extends MPLS from supporting Packet Switching
Capable (PSC) interfaces and switching to include support of three
new classes of interfaces and switching: Time-Division Multiplex
(TDM), Lambda Switch (LSC) and Fiber-Switch (FSC). A functional
description of the extensions to MPLS signaling needed to support
the new classes of interfaces and switching is provided in [GMPLS-
SIG]. [GMPLS-RSVP] describes RSVP-TE specific formats and
mechanisms needed to support all four classes of interfaces, and
CR-LDP extensions can be found in [GMPLS-LDP].
This document present the technology details that are specific to
G.709 Optical Transport Networks (OTN) as specified in ITU-T G.709
recommendation [ITUT-G709] which also includes pre-OTN developments.
Per [GMPLS-SIG], G.709 specific parameters are carried through the
signaling protocol in traffic parameter specific objects.
RELATED DOCUMENTS
http://www.ietf.org/internet-drafts/draft-ietf-ccamp-gmpls-architecture-00.txt
http://www.ietf.org/internet-drafts/draft-ietf-mpls-generalized-signalling-04.txt
http://www.ietf.org/internet-drafts/draft-ietf-mpls-generalized-rsvp-te-03.txt
http://www.ietf.org/internet-drafts/draft-ietf-mpls-generalized-cr-ldp-03.txt
http://www.ietf.org/internet-drafts/draft-ietf-ccamp-gmpls-sonet-sdh-01.txt
http://www.ietf.org/internet-drafts/draft-bellato-ccamp-g709-framework-00.txt
http://www.ietf.org/internet-drafts/draft-gasparini-ccamp-gmpls-g709-ospf-isis-00.txt
WHERE DOES IT FIT IN THE PICTURE OF THE SUB-IP WORK
It fits in the CCAMP WG - Control C (in this case control of Optical
Transport Networks)
WHY IS IT TARGETED AT THIS WG
The work is intended to complete the transmission plane technology
controlled by GMPLS signalling protocols in order to accommodate
the Optical Transport Networks.
This work results from the de-coupling of the "GMPLS signalling
functional specification" draft into technology independent and
technology dependent parts. It will complete the list of drafts
related to the control of ITU-T transmission technologies as
today defined in draft-ietf-ccamp-gmpls-sonet-sdh-01.txt
NB: some content of draft-lin-ccamp-ipo-common-label-request-00.txt
has been incorporated within this version of the document (in
agreement with the document's editor)
JUSTIFICATION
Recently, the ITU-T finalized the first version of the Optical
Transport Networks (OTN) standardization [ITUT-G709] to provide the
transparent digital pipe (digital wrapper) to be transported into
optical channels.
The OTN provides two fundamental degrees of flexibility: in terms of
wavelength and in terms of bandwidth transmission optimization
without losing the integrity of the lower bit rates pipes filled by
the access network. From that perspective, the OTN specification
enables as well the control of all-optical sub-networks.
However, the OTN architecture has today no explicit association with
any IP-based control plane, without which the future deployment of
OTN equipment is clearly uncertain. Therefore, [ITUT-G709] foresees
a strong requirement for future evolutions that can provide explicit
support for the OTN control layer. Requirements for the definition
of the OTN control plane (also referred to as Automatic Switched
Transport Network – ASON) are currently under definition at the ITU-T.
Consequently, Generalized MPLS (GMPLS) as specified in [GMPLS-SIG],
can more than certainly provide the efficient "control-plane
service" needed by the OTN specifications. Moreover, GMPLS can give
fundamental indications in terms of how OTN can be controlled and
where some additional features have to added (if needed) at the
optical transmission layer level, in order to hit the goal of
intelligent optical networks.
Today, GMPLS efforts are directed in extending IP well known
technology to control and manage lower non-packet based layered
networks. Using the same framework and the same kinds of signalling
and routing protocols suite to control multiple layers will not only
reduce the overall complexity of designing, deploying and maintaining
OTN networks but also allow potentially two contiguous layers to
inter-operate when using either an overlay, an augmented or a peer
model. In the mean time, GMPLS is very suitable for controlling each
layer completely independently.
Moreover, GMPLS can provide new capabilities and features for OTN
such as flexible and distributed LSP establishment (today performed
through the use of centralized Network Management Systems - NMS),
multi-layer circuit establishment and GMPLS-based restoration
methods that are of paramount importance for operators and carriers.