NAME OF I-D: http://www.ietf.org/internet-drafts/draft-fontana-gmpls-control-g709-00.txt SUMMARY 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. RELATED DOCUMENTS http://www.ietf.org/internet-drafts/draft-many-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-00.txt http://www.ietf.org/internet-drafts/draft-bms-optical-sdhsonet-mpls-control-frmwrk-00.txt http://www.ietf.org/internet-drafts/draft-fredette-mpls-lmp-wdm-01.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 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 - JUSTIFICATION 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 layer. 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.
draft-fontana-ccamp-gmpls-g709-00.txt