Extension to the Link Management Protocol (LMP/DWDM -rfc4209) for Dense Wavelength Division Multiplexing (DWDM) Optical Line Systems to manage the application code of optical interface parameters in DWDM application
draft-ggalimbe-ccamp-flex-if-lmp-13
Internet Engineering Task Force D. Hiremagalur, Ed.
Internet-Draft G. Grammel, Ed.
Intended status: Experimental Juniper
Expires: July 3, 2022 G. Galimberti, Ed.
Cisco
R. Kunze, Ed.
Deutsche Telekom
December 30, 2021
Extension to the Link Management Protocol (LMP/DWDM -rfc4209) for Dense
Wavelength Division Multiplexing (DWDM) Optical Line Systems to manage
the application code of optical interface parameters in DWDM application
draft-ggalimbe-ccamp-flex-if-lmp-13
Abstract
This experimental memo defines extensions to LMP(rfc4209) for
managing Optical parameters associated with Wavelength Division
Multiplexing (WDM) adding a set of parameters related to multicarrier
DWDM interfaces to be used in Spectrum Switched Optical Networks
(sson).
Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the
document authors. All rights reserved.
Status of This Memo
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This Internet-Draft will expire on July 3, 2022.
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Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. DWDM line system . . . . . . . . . . . . . . . . . . . . . . 3
3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Extensions to LMP-WDM Protocol . . . . . . . . . . . . . . . 4
5. Multi carrier Transceiver . . . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . 7
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 7
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
9.1. Normative References . . . . . . . . . . . . . . . . . . 8
9.2. Informative References . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
This experimental extension addresses the use cases described by
"draft-ietf-ccamp-dwdm-if-lmp" and extends it to the Spectrum
Switched Optical Network applications. LMP [RFC4902] provides link
property correlation capabilities that can be used between a
transceiver device and an Optical Line System (OLS) device. Link
property correlation is a procedure by which, intrinsic parameters
and capabilities are exchanged between two ends of a link. Link
property correlation as defined in RFC4204 allows either end of the
link to supervise the received signal and operates within a commonly
understood parameter window. Here the term 'link' refers in
particular to the attachment link between OXC and OLS (see Figure 1).
The relevant novelty is the interface configuration having a multiple
carrier where the client signal is spread on. The parameters are not
yet fully defined by ITU-T, so this document can jast be seen as an
experimental proposal not binding operators and vendors to comply and
implement them
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2. DWDM line system
Figure 1 shows a set of reference points (Rs and Ss), for a single-
channel connection between transmitter (Tx) and receiver (Rx)
devices. Here the DWDM network elements in between those devices
include an Optical Multiplexer (OM) and an Optical Demultiplexer
(OD). In addition it may include one or more Optical Amplifiers (OA)
and one or more Optical Add-Drop Multiplexers (OADM).
Ss +-------------------------------------------------+ Rs
| | DWDM Network Elements | |
+---+ | | | \ / | | | +---+
Tx L1---|->| \ +------+ +------+ / |--|-->Rx L1
+---+ | | | | | +------+ | | | | | +---+
+---+ | | FX | | | | FLEX | | | | FX | | +---+
Tx L2---|->| OM |-->|------|->|ROADM |--|------|->| OD |--|-->Rx L2
+---+ | | | | | | | | | | | | +---+
+---+ | | | | | +------+ | | | | | +---+
Tx L3---|->| / | DWDM | | ^ | DWDM | \ |--|-->Rx L3
+---+ | | / | Link +----|--|----+ Link | \ | | +---+
+-----------+ | | +----------+
+--+ +--+
| |
Rs v | Ss
+-----+ +-----+
|RxLx | |TxLx |
+-----+ +-----+
Ss = Sender reference point at the DWDM network element
tributary output, this can be a set of multiple transceivers
carrying the same client payload.
Rs = Receiver reference point at the DWDM network element
tributary input this can be a set of multiple transceivers
carrying the same client payload.
FX OM = Flex-Spectrum Optical Mux
FX OD = Flex-Spectrum Optical Demux
Flex ROADM = Flex-Spectrum Optical Add Drop Mux (reconfigurable)
extending Fig. 5.1/G.698.2
Figure 1: Linear Single Channel approach
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Figure 2 Extended LMP Model ( from [RFC4209] )
+------+ Ss +------+ +------+ Rs +------+
| | ----- | | | | ----- | |
| OXC1 | ----- | OLS1 | ===== | OLS2 | ----- | OXC2 |
| | ----- | | | | ----- | |
+------+ +------+ +------+ +------+
^ ^ ^ ^ ^ ^
| | | | | |
| +-----LMP-----+ +-----LMP-----+ |
| |
+----------------------LMP-----------------------+
OXC : is an entity that contains Multiple carriers transponders
OLS : generic Flex-Spectrum optical system, it can be -
Optical Mux, Optical Demux, Optical Add
Drop Mux, Amplifier etc.
OLS to OLS: represents the Optical Multiplex section
<xref target="ITU.G709"/>
Rs/Ss : reference points in between the OXC and the OLS
Figure 2: Extended LMP Model
3. Use Cases
The set of paramentes exchanged between OXC and OLS is to support the
Spectrum Switched Optical Network in therms of Number of Sub-carriers
available at the transceiver and their characteristics to provide the
SSON control plane all the information suitable to calculate the path
and the optical feasibility. This draft extends the "draft-ietf-
ccamp-dwdm-if-lmp" to sson applications.
4. Extensions to LMP-WDM Protocol
This document defines extensions to [RFC4209] to allow a set of
characteristic parameters, to be exchanged between a router or
optical switch and the optical line system to which it is attached.
In particular, this document defines additional Data Link sub-objects
to be carried in the LinkSummary message defined in [RFC4204] and
[RFC6205]. The OXC and OLS systems may be managed by different
Network Management Systems and hence may not know the capability and
status of their peer. These messages and their usage are defined in
subsequent sections of this document.
The following new messages are defined for the SSON extension
- Multi carrier Transceiver (sub-object Type = TBA)
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5. Multi carrier Transceiver
These are a set of general parameters extending the description in
[G698.2] and [G.694.1]. ITU-T working groups are working to detail
most of parameters and an update of the TLV may be required.
Other than the Application Identifier described in [G698.2] and
draft-ietf-ccamp-dwdm-if-lmp the parameters to describe a
multicarrier transceiver are describes as follows:
1. Modulation format: indicates the Transceiver capabilities
to support a single or multiple modulation format like:
BPSK, DC-DP-BSPSK, QPSK, DP-QPSK, QAM16, DP-QAM16,
DC-DP-QAM16, 64QAM. Hybrid modulation format are supported as
well and the parameter is given in bit per symbol.
2. FEC: indicates the FEC types the transceiver can support
3. baud rate: symbols rate, basically this identify the
channel symbols number per second
4. Num Carriers: number of (sub)carriers the trasceiver can support
and can be "mapped" in a Mediachannel (or tunnel)
5. Bits/symbol: number of bit per simbol - fractional in case of
hybrid modulation format. (aka spectral efficiency)
6. Subcarrier band (minimum distance between subcarriers) in GHz
7. Guard band (required guard band at the side of media channel)
8. Sub-carrier TX Power: output optical power the transceiver can
provide
9. Sub-carrier RX Power: Input optical power Range the transceiver
can support, this is known also as Sensitivity
10 Max-pol-power-difference: max power difference between the
polarised components
11 Max-pol-skew-difference: maw Skew between polarised signal and
subcarriers supported by the transceiver
12. Max-inter-carrier-skew: maximum skew between carriers in tbe same
mediachannel (or tunnel)
13. Sub-carrier OSNR robustness
Figure 3: The format of the this sub-object (Type = TBA, Length =
TBA) is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | (Reserved) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S|I| Modulation ID | FEC |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| baud rate (Symbol Rate) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Number of subcarriers | Bit/Symbol |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| subcarrier band | guard band |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| sub-carrier TX power |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| sub-carrier RX power HIGH |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| sub-carrier RX power LOW |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max-pol-power-difference |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max-pol-skew-difference |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max-inter-carrier-skew |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| sub-carrier OSNR |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- S: standardized format;
- I: input / output (1 / 0)
- Modulation ID (Format) : is the modulation type:
BPSK, DC DP BSPSK, QPSK, DP QPSK, 8QAM, 16QAM,
32QAM, 64QAM, etc.
- <TBD> (ITU-T reference)
- value > 32768 (first bit is 1): custom defined values
Value 0 is reserved to be used if no value is defined
- FEC: the signal Forward Error Corrections type (16-bit
unsigned integer), the defined values are:
- <TBD> (ITU-T reference)
- 32768 (first bit is 1): custom defined values
Value 0 is reserved to be used if no value is defined
- Baud Rate: the signal symbol rate (IEEE 32-bit float,
in bauds/s)
Value 0 is reserved to be used if no value is defined
- Num Carriers
- Bits/symbol(BPS) this indicates the bit per symbol in case of
hybrid modulation format. It is an off-set with values from 0
to 127 to be applied to the specified Modulation Format and
indicates the mix between the selected Modulation Format and its
upper adjacent.
(e.g. QPSK + 63 BPS indicates that there is a 50% MIX between
QPSK and 8-QAM = 2.5 bits per symbol) If value = 0 the
standard Modulation Format is applied
- Subcarrier band (minimum distance between subcarriers)
- Guard band (required guard band at the side of media channel)
- Sub-carrier Transmit Power
- Sub-carrier Receive HIGH Power range (Sensitivity)
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- Sub-carrier Receive LOW Power range (Sensitivity)
- Sub-carrier OSNR robustness
- Max-pol-power-difference
- Max-pol-skew-difference
- Max-inter-carrier-skew
- Sub-carrier OSNR
Figure 3: Multi carrier Transceiver
6. Security Considerations
LMP message security uses IPsec, as described in [RFC4204]. This
document only defines new LMP objects that are carried in existing
LMP messages, similar to the LMP objects in [RFC:4209]. This
document does not introduce new security considerations.
7. IANA Considerations
LMP <xref target="RFC4204"/> defines the following name spaces and
the ways in which IANA can make assignments to these namespaces:
- LMP Message Type
- LMP Object Class
- LMP Object Class type (C-Type) unique within the Object Class
- LMP Sub-object Class type (Type) unique within the Object Class
This memo introduces the following new assignments:
LMP Sub-Object Class names:
under DATA_LINK Class name (as defined in <xref target="RFC4204"/>)
- Multi carrier Transceiver (sub-object Type = TBA)
8. Contributors
Zafar Ali
Cisco
3000 Innovation Drive
KANATA
ONTARIO K2K 3E8
zali@cisco.com</email>
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9. References
9.1. Normative References
[ITU.G694.1]
International Telecommunications Union, ""Spectral grids
for WDM applications: DWDM frequency grid"",
ITU-T Recommendation G.698.2, February 2012.
[ITU.G698.2]
International Telecommunications Union, "Amplified
multichannel dense wavelength division multiplexing
applications with single channel optical interfaces",
ITU-T Recommendation G.698.2, November 2009.
[ITU.G709]
International Telecommunications Union, "Interface for the
Optical Transport Network (OTN)", ITU-T Recommendation
G.709, June 2016.
[ITU.G872]
International Telecommunications Union, "Architecture of
optical transport networks", ITU-T Recommendation G.872,
January 2017.
[ITU.G874.1]
International Telecommunications Union, "Optical transport
network (OTN): Protocol-neutral management information
model for the network element view", ITU-T Recommendation
G.874.1, November 2016.
[RFC4204] Lang, J., Ed., "Link Management Protocol (LMP)", RFC 4204,
DOI 10.17487/RFC4204, October 2005,
<https://www.rfc-editor.org/info/rfc4204>.
[RFC4209] Fredette, A., Ed. and J. Lang, Ed., "Link Management
Protocol (LMP) for Dense Wavelength Division Multiplexing
(DWDM) Optical Line Systems", RFC 4209,
DOI 10.17487/RFC4209, October 2005,
<https://www.rfc-editor.org/info/rfc4209>.
[RFC6205] Otani, T., Ed. and D. Li, Ed., "Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers",
RFC 6205, DOI 10.17487/RFC6205, March 2011,
<https://www.rfc-editor.org/info/rfc6205>.
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9.2. Informative References
[RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629,
DOI 10.17487/RFC2629, June 1999,
<https://www.rfc-editor.org/info/rfc2629>.
[RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410,
DOI 10.17487/RFC3410, December 2002,
<https://www.rfc-editor.org/info/rfc3410>.
[RFC4181] Heard, C., Ed., "Guidelines for Authors and Reviewers of
MIB Documents", BCP 111, RFC 4181, DOI 10.17487/RFC4181,
September 2005, <https://www.rfc-editor.org/info/rfc4181>.
Authors' Addresses
Dharini Hiremagalur (editor)
Juniper
1194 N Mathilda Avenue
Sunnyvale - 94089 California
USA
Phone: +1408
Email: dharinih@juniper.net
Gert Grammel (editor)
Juniper
Oskar-Schlemmer Str. 15
80807 Muenchen
Germany
Phone: +49 1725186386
Email: ggrammel@juniper.net
Gabriele Galimberti (editor)
Cisco
Via S. Maria Molgora, 48 c
20871 - Vimercate
Italy
Phone: +390392091462
Email: ggalimbe@cisco.com
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Ruediger Kunze (editor)
Deutsche Telekom
Winterfeldtstr. 21-27
10781 Berlin
Germany
Phone: +491702275321
Email: RKunze@telekom.de
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