Network Working Group D. King
Internet Draft A. Farrel
Updates: 3471, 6205 (if approved) Old Dog Consulting
Intended Status: Standards Track Y. Li
Expires: 30 March 2014 Nanjing University
30 September 2013
Generalized Labels for the Flexi-Grid in
Lambda Switch Capable (LSC) Label Switching Routers
GMPLS supports the description of optical switching by identifying
entries in fixed lists of switchable wavelengths (called grids)
through the encoding of lambda labels. Work within the ITU-T Study
Group 15 has defined a finer granularity grid, and the facility to
flexibly select different widths of spectrum from the grid. This
document defines a new GMPLS lambda label format to support this
This document updates RFC 3471 and RFC 6205 by introducing a new
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As described in [RFC3945], GMPLS extends MPLS from supporting only
Packet Switching Capable (PSC) interfaces and switching, to also
support four new classes of interfaces and switching that include
Lambda Switch Capable (LSC).
A functional description of the extensions to MPLS signaling needed
to support this new class of interface and switching is provided in
Section 188.8.131.52 of [RFC3471] states that wavelength labels "only have
significance between two neighbors": global wavelength semantics are
not considered. [RFC6205] defines a standard lambda label format
that has a global semantic and which is compliant with both the Dense
Wavelength Division Multiplexing (DWDM) grid [G.694.1] and the Coarse
Wavelength Division Multiplexing (CWDM) grid [G.694.2]. The terms
DWDM and CWDM are defined in [G.671].
A flexible grid network selects its data channels as arbitrarily
assigned pieces of the spectrum. Mixed bitrate transmission systems
can allocate their channels with different spectral bandwidths so
that the channels can be optimized for the bandwidth requirements of
the particular bit rate and modulation scheme of the individual
channels. This technique is regarded as a promising way to improve
the network utilization efficiency and fundamentally reduce the cost
of the core network.
The "flexi-grid" has been developed within the ITU-T Study Group 15
to allow selection and switching of pieces of the optical spectrum
chosen flexibly from a fine granularity grid of wavelengths with
variable spectral bandwidth [G.694.1]. This document updates the
Farrel, King, and Li Expires March 2014 [Page 2]draft-farrkingel-ccamp-flexigrid-lambda-label-07.txt September 2013