CCAMP Working Group E. Bellagamba, Ed.
Internet-Draft G. Bottari, Ed.
Intended status: Experimental F. Fondelli, Ed.
Ericsson
Expires: October 27, 2010 April 25, 2010
OSPF Extensions for Wavelength Switched Optical Networks (WSON) with
Impairments
draft-eb-ccamp-ospf-wson-impairments-01
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Abstract
This document specifies OSPF extensions to carry information about
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physical impairments. This information set is required for the
feasibility assessment of the lightpath to be established across an
optical switched network controlled by GMPLS.
The document intent is both disseminating experimental results
carried out within Ericsson Research and provide an initial input for
further OSPF extensions in CCAMP IETF group.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Contributing Authors . . . . . . . . . . . . . . . . . . . 3
1.2. Requirements Language . . . . . . . . . . . . . . . . . . 3
1.3. Background . . . . . . . . . . . . . . . . . . . . . . . . 3
2. OSPF Extensions . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Operation overview . . . . . . . . . . . . . . . . . . . . 3
2.2. Impairment Specification sub TLV . . . . . . . . . . . . . 6
2.3. Parameters of the optical interfaces at the far ends
of the path . . . . . . . . . . . . . . . . . . . . . . . 6
2.3.1. Transmitter Characteristics sub-sub TLV . . . . . . . 6
2.3.2. Receiver Characteristics sub-sub TLV . . . . . . . . . 8
2.4. Parameters of the network nodes involved in the
propagation of the optical signal . . . . . . . . . . . . 9
2.4.1. Amplifier sub-sub TLV with aggregated parameters . . . 9
2.4.2. Amplifier Characteristics sub-sub TLV with sparse
parameters . . . . . . . . . . . . . . . . . . . . . . 9
2.4.3. Dispersion Compensation Module sub-sub TLV . . . . . . 10
2.5. Fiber Span . . . . . . . . . . . . . . . . . . . . . . . . 11
2.5.1. Link impairment sub-sub-TLV . . . . . . . . . . . . . 12
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
4. Security Considerations . . . . . . . . . . . . . . . . . . . 15
5. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1. Normative References . . . . . . . . . . . . . . . . . . . 15
5.2. Informative References . . . . . . . . . . . . . . . . . . 16
Appendix A. Additional Stuff . . . . . . . . . . . . . . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16
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1. Introduction
1.1. Contributing Authors
The editors gratefully acknowledge the precious contributions of
Benoit Tremblay and Andras Kern.
1.2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
1.3. Background
Wavelength Switched Optical Networks [WSON-Frame] is an ongoing
activity in IETF's CCAMP and PCE working group which is currently
addressing both the Routing and Wavelength Assignment (RWA)
constraint and the physical impairments (PI) in optical networks.
According to the current work in IETF, the optical parameters are not
advertised by OSPF protocol and they must be retrieved in a different
way. The typical approach is to consider the worst case values ("end
of life" values) and to perform path computation in leveraging this
data. This brings to a very conservative routing and prevents any
sort of dynamic wavelength provisioning and recovery (i.e. recovery/
rerouting is not possible).
A fast way to have a snapshot of the physical status of the network
would be of paramount importance in WSON networks and would allow a
dynamic on-line PCE both centralized (i.e. in NMS) or distributed
(i.e. in each ingress node).
It is worth to be noted that the physical impairments addressed in
this document is a subset of all the possible parameters. The choice
is bounded to a particular PCE computation and therefore the OSPF
could be further enriched with an additional set of parameters
whenever it is needed by the usage of a different PCE.
2. OSPF Extensions
2.1. Operation overview
The network architecture considered in this document is based on a
centralized or distributed PCE positioning. The PCE computes the
working and recovery paths based on known network characteristics and
has the task to assess the feasibility of the computed paths.
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Details on the physical validation service are out of the scope of
this document
The Path Computation is completed taking into account the following
groups of parameters:
- the parameters of the optical interfaces at the far ends of the
path;
- the parameters of the network nodes involved in the propagation
of the optical signal;
- the fiber spans where the signal is carried.
Moreover, two different kind of strategies can be taken into account:
- aggregated parameters distribution;
- sparse parameter distribution.
Each TE link in the network is described by OSPF with a TE LSA (as
described in [RFC3630]) containing a Link TLV. This object is named
TE Link LSA and comprises a certain number of sub-objects (sub-TLVs).
Each of these sub-objects describes some of the characteristics of
the TE link.
The sub-TLVs described in the following paragraphs are intended to be
inserted in the TE LSA, in the Link TLV.
Below, an example showing a possible TLVs tree is provided.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| LSA age | Options | 10 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 1 | Instance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Advertising Router |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| LS Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| LS Checksum | LS Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type (2)(Link) | Length (196) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sub-Type (Imp.Spec)(TBD)(IANA)| Length (192) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-Type (Transm.)(1)(IANA) | Length (36) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ payload ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-Type (Rec.)(2)(IANA) | Length (28) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ payload ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-Type (Ampl.)(4)(IANA) | Length (32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ payload ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-Type (DCM)(5)(IANA) | Length (28) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ payload ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-Type (Link Imp.)(6)(IANA) | Length (64) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ payload ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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2.2. Impairment Specification sub TLV
The "Impairment Specification sub TLV" is depicted below.
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sub-Type (Imp.Spec)(TBD)(IANA)| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ payload ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The "Impairment Specification sub TLV" is located in the Link TLV and
groups together the following s-s-TLVs:
- "Transmitter Characteristics" s-s-TLV
- "Receiver Characteristics" s-s-TLV
- "Amplifier Characteristics" s-s-TLV
- "Dispersion Compensation Module" s-s-TLV
- "Link Impairment" s-s-TLV
2.3. Parameters of the optical interfaces at the far ends of the path
The parameters characterizing the node optical interfaces are the
"Receiver" and "Transmitter" parameters.
2.3.1. Transmitter Characteristics sub-sub TLV
The "Transmitter Characteristics" sub-sub TLV is included in the
"Impairment Specifications" sub-TLV.
The "Transmitter Characteristics" sub-sub TLV is depicted below.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-Type (Transm.)(1)(IANA) | Length (36) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| System Operating Wavelength Range |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| System Central Wavelength |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Channel Spacing |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Bit Rate |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Extinction Ratio |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Duty Cycle |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Relative Intensity Noise |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Launch OSNR |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The System Operating Wavelength Range indicates the frequency range
centered on the Central Wavelength and in measured in nm. Refer to
[G.959.1] for further details.
The System Central Wavelength is also indicated with the acronym
lambda_m and in measured in nm. Refer to [G.959.1] for further
details.
The Channel Spacing is also indicated with the acronym delta_lambda
and in masured in nm. Refer to [G.959.1] for further details.
The Bit Rate also indicated with the acronym R and in measured in
Gpbs.
The Extinction Ratio is also indicated with the acronym E_r and is
measured in dB. Refer to [G.959.1] for further details.
The Duty Cycle is also indicated with the acronym D_C and is measured
in %.
The Relative Intensity Noise also indicated with the acronym RIN and
in measured in [Db/Hz].
The Launch OSNR (Optical Signal to Noise Ratio) is also indicated
with the acronym OSNR_in and in measured in Db.
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2.3.2. Receiver Characteristics sub-sub TLV
The "Receiver Characteristics" sub-sub TLV is included in the
"Impairment Specifications" sub-TLV.
The "Receiver Characteristics" sub-sub TLV together is depicted
below.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-Type (Receiv.)(2)(IANA) | Length (28) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sensitivity |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Overload |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Transimpedance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Electrical Bandwidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Optical Bandwidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| FEC Gain |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Sensitivity is also indicated with the acronym S and in measured
in dB_m. Refer to [G.959.1] for further details.
The Overload is also indicated with the acronym O_l and in measured
in dB_m. Refer to [G.959.1] for further details.
The Transimpedance is also indicated with the acronym T_r and in
measured in Ohm.
The Electrical Bandwidthis also indicated with the acronym B_e and in
measured in GHz.
The Optical Bandwidth is also indicated with the acronym B_o and in
measured in GHz.
The FEC Gain is also indicated with the acronym G_fec and in measured
in dB.
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2.4. Parameters of the network nodes involved in the propagation of
the optical signal
The parameters characterizing the transit nodes are mainly the
amplifier parameters.
2.4.1. Amplifier sub-sub TLV with aggregated parameters
In this strategy, the physical description of the network is given
using several sub-sets of homogeneous elements: types of amplifier,
types of fibers, types of dispersion compensator and so on.
This strategy assumes that the PCE is aware of the parameters
associated to each type of element.
In this case is sufficient to distribute, in the routing protocol, a
string containing the amplifier type because the Traffic Engineering
Database is aware of the parameters associated to the type itself.
The "Amplifier Characteristics" with aggregated parameters sub-sub
TLV is included in the "Impairment Specifications" sub-TLV.
The "Amplifier Characteristics" sub-sub TLV is depicted below.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-Type (Ampl.)(3)(IANA) | Length (8) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Amplifier Set Name |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2.4.2. Amplifier Characteristics sub-sub TLV with sparse parameters
In this strategy, the physical description of the network is given
using a complete enumeration of the parameters. This method can be
used when there is not a predefined list of elements or when the
involved element is not included in the predefined set.
The "Amplifier Characteristics" with sparse parameters sub-sub TLV is
included in the "Impairment Specifications" sub-TLV.
The "Amplifier Characteristics" sub-sub TLV is depicted below.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-Type (Ampl.)(4)(IANA) | Length (32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Multichanel Gain Variation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Multichanel Gain Tilt |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Total Received Power |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Total Launched Power |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Noise Figure |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Polarization Mode Dispersion |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Polarization Dependent Loss |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Multichanel Gain Variation is also indicated with the acronym GV
and in measured in dB.
The Multichanel Gain Tilt is also indicated with the acronym GT and
in measured in dB.
The Total Received Power is also indicated with the acronym P_rx and
in measured in dB_m.
The Total Launched Power is also indicated with the acronym P_tx and
in measured in dB_m.
The Noise Figure is also indicated with the acronym NF and in
measured in dB.
The Polarization Mode Dispersion is also indicated with the acronym
PMD and in measured in ps.
The Polarization Dependent Loss is also indicated with the acronym
PDL and in measured in dB.
2.4.3. Dispersion Compensation Module sub-sub TLV
The "Dispersion Compensation Module" sub-sub TLV is depicted below.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-Type (DCM)(5)(IANA) | Length (28) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Chromatic Dispersion |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Dispersion Slope |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Dispersion Tolerance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Slope Tolerance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Polarization Mode Dispersion |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Polarization Dependent Loss |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Chromatic Dispersion is also indicated with the acronym D_DCM and
in measured in ps/nm*km.
The Dispersion Slope is also indicated with the acronym S_DCM and in
measured in ps/nm^2.
The Dispersion Tolerance is also indicated with the acronym delta_DCM
and in measured in ps/nm.
The Slope Tolerance is also indicated with the acronym sigma_DCM and
in measured in ps/nm^2.
The Polarization Mode Dispersion is also indicated with the acronym
PMD_DCM and in measured in ps.
The Polarization Dependent Loss is also indicated with the acronym
PDL_DCM and in measured in dB.
2.5. Fiber Span
The fiber span is connected to the network element (NE) ports. NE
ports that share common characteristics can be bundled to form a TE
Link. One TE Link is seen as a bundle of ports/fibers and its
capacity in terms of available channels is the union of the available
channels associated to the single ports. Each physical port in the
NE represents a link that is associated to a given TE link.
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2.5.1. Link impairment sub-sub-TLV
The first parameter associated with a link is a local identifier that
can univocally identify it: Link ID.
The "Link impairment" sub-sub TLV is included in the "Impairment
Specifications" sub-TLV.
It is worth to be noted that more than one Link impairment sub-TLV
can comprise more than one Link Impairment sub-sub-TLV, depending on
the number of link boundled in a TE-link.
The "Fiber Span Characteristics" sub-sub TLV together with its inner
TLVs is depicted below.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-Type (Link Imp.)(6)(IANA) | Length (64) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| S-s-s-Type (1)(IANA) | Length (8) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Id |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Length of Span |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Attenuation Coefficient |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Chromatic Dispersion |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Dispersion Slope |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Dispersion Uncertainty |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Slope Uncertainty |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PMD coefficient |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Effective Area |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Non Linear Refractive |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Raman Coefficient |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Connector Attenuation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Splice Attenuation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Span Margin |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+--------------------------+-----------------+--------------------+
| "Link id" s-s-s-TLV type | Value | TLV Length (Bytes) |
+--------------------------+-----------------+--------------------+
| 1 | Unnum. Link Id | 8 |
| 2 | IPv4 Link Id | 8 |
| 3 | IPv6 Link Id | 20 |
+--------------------------+-----------------+--------------------+
Table 1
The Length of Span is also indicated with the acronym L_si and in
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measured in Km.
The Attenuation Coefficient is also indicated with the acronym alpha
and in measured in dB/Km.
The Chromatic Dispersion is also indicated with the acronym D and in
measured in ps*(nm*km).
The Dispersion Slope is also indicated with the acronym S and in
measured in ps*(nm^2*km).
The Dispersion Uncertainty is also indicated with the acronym delta
and in measured in ps*(nm*km).
The Slope Uncertainty is also indicated with the acronym sigma and in
measured in ps*(nm^2*km).
The PMD coefficient is also indicated with the acronym PDM and in
measured in ps/Km^0,5..
The Effective Area is also indicated with the acronym A_E and in
measured in microm^2.
The Non Linear Refractive is also indicated with the acronym n_2 and
in measured in microm^2/W.
The Raman Coefficient is also indicated with the acronym g_R and in
measured in m/W.
The Connector Attenuation is also indicated with the acronym A_C and
in measured in dB.
The Splice Attenuation is also indicated with the acronym alpha_S and
in measured in dB.
The Span Margin is also indicated with the acronym SM and in measured
in dB.
The "Link number sub-sub-sub-type" values can be freely assigned.
Following there ia a suggestion for such assignement:
3. IANA Considerations
This document specifies the following new TLV types.
Sub TLVs types to be carried in the TE LSA, Link TLV:
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- "Impairment Specifications" sub-TLV type: TBD.
Sub-sub TLV types to be carried in the "Impairment Specifications"
sub-TLV:
- "Transmitter Characteristics" sub-sub-TLV type: 1
- "Receiver Characteristics" sub-sub-TLV type: 2
- "Amplifier Characteristics Aggregated Parameters" sub-sub-TLV
type: 3
- "Amplifier Characteristics Sparse Parameters" sub-sub-TLV type:
4
- "Dispersion Compensator Module" sub-sub-TLV type: 5
- "Link Impairment" sub-sub-TLV type: 6
4. Security Considerations
5. References
5.1. Normative References
[PCE-WSON]
Lee, Y., Bernstein, G., Takeda, T., and T. Tsuritani,
"PCEP Requirements for WSON Routing and Wavelength
Assignment", 2009,
<draft-ietf-pce-wson-routing-wavelength>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3630] Katz, D., Kompella, K., and D. Yeung, "Traffic Engineering
(TE) Extensions to OSPF Version 2", RFC 3630,
September 2003.
[RFC4201] Kompella, K., Rekhter, Y., and L. Berger, "Link Bundling
in MPLS Traffic Engineering (TE)", RFC 4201, October 2005.
[WSON IMP]
Lee, Y., Bernstein, G., Li, D., and G. Martinelli, "A
Framework for the Control of Wavelength Switched Optical
Networks (WSON) with Impairments", 2009,
<draft-ietf-ccamp-wson-impairments>.
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[WSON-Encode]
Bernstein, G., Lee, Y., Li, D., and W. Imajuku, "Framework
for GMPLS and PCE Control of Wavelength Switched Optical
Networks", 2009, <draft-ietf-ccamp-rwa-wson-encode>.
[WSON-FWK]
Lee, Y., Bernstein, G., and W. Imajuku, "Framework for
GMPLS and PCE Control of Wavelength Switched Optical
Networks (WSON)", 2009,
<draft-ietf-ccamp-rwa-wson-framework>.
5.2. Informative References
[ASON-Routing]
Papadimitriou, D., "OSPFv2 Routing Protocols Extensions
for ASON Routing", 2009,
<draft-ietf-ccamp-gmpls-ason-routing-ospf>.
[G.959.1] "Optical Transport Network Physical Layer Interfaces", <it
u.int/itudoc/itu-t/aap/sg15aap/history/g9591/g9591.html>.
[RFC4258] Brungard, D., "Requirements for Generalized Multi-Protocol
Label Switching (GMPLS) Routing for the Automatically
Switched Optical Network (ASON)", RFC 4258, November 2005.
[RFC4652] Papadimitriou, D., L.Ong, Sadler, J., Shew, S., and D.
Ward, "Evaluation of Existing Routing Protocols against
Automatic Switched Optical Network (ASON) Routing
Requirements", RFC 4652, October 2006.
[WSON-Frame]
Bernstein, G., Lee, Y., and W. Imajuku, "Framework for
GMPLS and PCE Control of Wavelength Switched Optical
Networks", 2009, <draft-ietf-ccamp-wavelength-switched-
framework>.
Bellagamba, et al. Expires April 20, 2010 [Page 16]
Internet-Draft OSPF Ext for WSON impairments October 2009
Authors' Addresses
Elisa Bellagamba
Ericsson
Email: elisa.bellagamba@ericsson.com
Giulio Bottari
Ericsson
Email: giulio.bottari@ericsson.com
Francesco Fondelli
Ericsson
Email: francesco.fondelli@ericsson.com
Bellagamba, et al. Expires April 20, 2010 [Page 17]