[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
CCAMP WG - http://www.ietf.org/internet-drafts/draft-fontana-gmpls-control-g709-00.txt
- To: email@example.com
- Subject: CCAMP WG - http://www.ietf.org/internet-drafts/draft-fontana-gmpls-control-g709-00.txt
- From: Dimitri Papadimitriou <firstname.lastname@example.org>
- Date: Thu, 17 May 2001 23:19:09 +0200
- Delivery-date: Thu, 17 May 2001 14:20:04 -0700
- Envelope-to: email@example.com
- Organization: Alcatel Bell - IPO NSG
NAME OF I-D:
Along with the current development of packet over lambda switching
(referred to as MPLambdaS), there is considerable development in
optical transport systems based on the ITU-T G.872 [ITUT-G872] and
G.709 [ITUT-G709] specification. For that purpose, the inter-working
of G.709 capable devices on top lambda switched networks is relevant
to new optical developments.
In this document, we propose to introduce the G.709 Optical Transport
Hierarchy (OTH) defined at the ITU-T into the label space of GMPLS
whose architecture is described in [GMPLS-ARCH]. As [GMPLS-SIG]
introduced the digital wrapper and optical channel as LSP encoding
types for GMPLS, the objective of this memo is to define the specific
extensions needed to support GMPLS signalling for OTN.
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
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 accomodate
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-00.txt
NB: some content of draft-lin-ccamp-ipo-common-label-request-00.txt
will be incorporated within a new version of this document (in
agreement with the document's editor) - to be published very
soon in order to reflect these changes and be aligned with the
other technology dependent drafts -
Recently, the ITU-T finalized the first version of the Optical
Transport Networks (OTN) recommendation, the G.709 Optical Transport
Hierarchy (OTH) recommendation, defining the transparent digital pipe
(digital wrapper) associated with optical channels. OTN provides a
further degree of flexibility and allows the management of mid-size
all-optical networks (even if today with some limitations). Therefore,
the multiplexing of lower bit-rate wavelength with digital wrapper
sub-structure can provide where needed the granularity transmission in
the backbone network.
At that point the OTN will have the 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.
Along with the current development of packet over lambda switching,
there is considerable development in transport systems based on the
ITU-T G.709 specification. For that purpose, the inter-working of G.709
capable devices on top lambda switched networks is relevant to new
optical developments at the OIF and IETF.
Unfortunately the expected flexible OTN architecture has today no
explicit association with a control layer without which the future
deployment of OTN equipment is really questionable. In any case, ITU-T
G.709 recommendation foresees some margins for future evolutions that
could be taken into consideration for explicit support of the control
Consequently, Generalized MPLS (GMPLS) is certainly the best candidate
to provide the guidelines for the "control service" needed by the OTN.
Moreover GMPLS can give fundamental indications in terms of how OTN can
be controlled and where some additional feature has to added (if needed)
at the optical physical transmission layer level.