draft-ietf-ccamp-flexi-grid-fwk-06.txt   draft-ietf-ccamp-flexi-grid-fwk-07.txt 
CCAMP Working Group O. Gonzalez de Dios, Ed. CCAMP Working Group O. Gonzalez de Dios, Ed.
Internet-Draft Telefonica I+D Internet-Draft Telefonica I+D
Intended status: Informational R. Casellas, Ed. Intended status: Informational R. Casellas, Ed.
Expires: February 26, 2016 CTTC Expires: March 2, 2016 CTTC
August 25, 2015 August 30, 2015
Framework and Requirements for GMPLS-based control of Flexi-grid DWDM Framework and Requirements for GMPLS-based control of Flexi-grid DWDM
networks networks
draft-ietf-ccamp-flexi-grid-fwk-06 draft-ietf-ccamp-flexi-grid-fwk-07
Abstract Abstract
To allow efficient allocation of optical spectral bandwidth for high To allow efficient allocation of optical spectral bandwidth for high
bit-rate systems, the International Telecommunication Union bit-rate systems, the International Telecommunication Union
Telecommunication Standardization Sector (ITU-T) has extended its Telecommunication Standardization Sector (ITU-T) has extended its
Recommendations G.694.1 and G.872 to include a new dense wavelength Recommendations G.694.1 and G.872 to include a new dense wavelength
division multiplexing (DWDM) grid by defining a set of nominal division multiplexing (DWDM) grid by defining a set of nominal
central frequencies, channel spacings and the concept of "frequency central frequencies, channel spacings and the concept of "frequency
slot". In such an environment, a data plane connection is switched slot". In such an environment, a data plane connection is switched
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This Internet-Draft will expire on February 26, 2016. This Internet-Draft will expire on March 2, 2016.
Copyright Notice Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
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4.5. Media Layer Resource Allocation Considerations 4.5. Media Layer Resource Allocation Considerations
A media channel has an associated effective frequency slot. From the A media channel has an associated effective frequency slot. From the
perspective of network control and management, this effective slot is perspective of network control and management, this effective slot is
seen as the "usable" end-to-end frequency slot. The establishment of seen as the "usable" end-to-end frequency slot. The establishment of
an LSP is related to the establishment of the media channel and the an LSP is related to the establishment of the media channel and the
configuration of the effective frequency slot. configuration of the effective frequency slot.
A "service request" is characterized (at a minimum) by its required A "service request" is characterized (at a minimum) by its required
effective frequency slot width. This does not preclude that the effective slot width. This does not preclude that the request may
request may add additional constraints such as also imposing the add additional constraints such as also imposing the nominal central
nominal central frequency. A given effective frequency slot may be frequency. A given effective frequency slot may be requested for the
requested for the media channel in the control plane LSP setup media channel in the control plane LSP setup messages, and a specific
messages, and a specific frequency slot can be requested on any frequency slot can be requested on any specific hop of the LSP setup.
specific hop of the LSP setup. Regardless of the actual encoding, Regardless of the actual encoding, the LSP setup message specifies a
the LSP setup message specifies a minimum effective frequency slot minimum effective frequency slot width that needs to be fulfilled in
width that needs to be fulfilled in order to successful establish the order to successful establish the requsted LSP.
requsted LSP.
An effective frequency slot must equally be described in terms of a An effective frequency slot must equally be described in terms of a
central nominal frequency and its slot width (in terms of usable central nominal frequency and its slot width (in terms of usable
spectrum of the effective frequency slot). That is, it must be spectrum of the effective frequency slot). That is, it must be
possible to determine the end-to-end values of the n and m possible to determine the end-to-end values of the n and m
parameters. We refer to this by saying that the "effective frequency parameters. We refer to this by saying that the "effective frequency
slot of the media channel/LSP must be valid". slot of the media channel/LSP must be valid".
In GMPLS the requested effective frequency slot is represented to the In GMPLS the requested effective frequency slot is represented to the
TSpec present in the RSVP-TE Path message, and the effective TSpec present in the RSVP-TE Path message, and the effective
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