| Internet-Draft | Yang for WDM Path Computation | March 2024 |
| Busi, et al. | Expires 2 September 2024 | [Page] |
This document provides a mechanism to request path computation in Wavelength-Division Multiplexing (WDM) optical networks composed of Wavelength Switched Optical Networks (WSON) and Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) switched technologies. This model augments the Remote Procedure Calls (RPCs) defined in RFC YYYY.¶
[RFC EDITOR NOTE: Please replace RFC YYYY with the RFC number of draft-ietf-teas-yang-path-computation once it has been published.¶
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Copyright (c) 2024 IETF Trust and the persons identified as the document authors. All rights reserved.¶
This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License.¶
[I-D.ietf-teas-yang-path-computation] describes key use cases, where a client needs to request underlying Software-Defined Network (SDN) controllers for path computation. In some of these use cases, the underlying SDN controller can control a single-layer optical technologies, including Optical Transport Network (OTN), Wavelength Switched Optical Networks (WSON), Flexi-grid, and multi-layer Optical network.¶
This document defines YANG data models, which augment the generic Path Computation RPC defined in [I-D.ietf-teas-yang-path-computation], with technology-specific augmentations required to request path computation to an underlying Optical SDN controller. These models allow a client to delegate path computation tasks to the underlying Optical SDN controller without having to obtain optical-layer information from the controller and performing feasible path computation itself. This is especially helpful in cases where computing optically-feasible paths require knowledge of physical-layer states, such as optical impairments, which are visible only to the Optical controller.¶
Refer to [RFC7446] and [RFC7581] for the key terms used in this document. The following terms are defined in [RFC7950] and are not redefined here:¶
The following terms are defined in [RFC6241] and are not redefined here:¶
The terminology for describing YANG data models is found in [RFC7950].¶
A simplified graphical representation of the data model is used in Section 3 of this document. The meaning of the symbols in these diagrams is defined in [RFC8340].¶
In this document, names of data nodes and other data model objects are prefixed using the standard prefix associated with the corresponding YANG imported modules, as shown in Table 1.¶
| Prefix | YANG module | Reference |
|---|---|---|
| l0-types | ietf-layer0-types | [RFCZZZZ] |
| te | ietf-te | [RFCKKKK] |
| tepc | ietf-te-path-computation | [RFCYYYY] |
| wdm-pc | ietf-wdm-path-computation | RFCXXXX |
RFC Editor Note: Please replace XXXX with the RFC number assigned to this document. Please replace ZZZZ with the RFC number assigned to [I-D.ietf-ccamp-rfc9093-bis]. Please replace KKKK with the RFC number assigned to [I-D.ietf-teas-yang-te]. Please replace YYYY with the RFC number assigned to [I-D.ietf-teas-yang-path-computation]. Please remove this note.¶
The YANG data models for requesting WDM path computation are defined as augmentations of the generic Path Computation RPC defined in [I-D.ietf-teas-yang-path-computation], as shown in Figure 1.¶
+--------------------------+ o: augment
TE generic | ietf-te-path-computation |
+--------------------------+
o
|
|
|
+---------------------------+
| ietf-wdm-path-computation |
+---------------------------+
The entities and Traffic Engineering (TE) attributes, such as requested path and tunnel attributes, defined in [I-D.ietf-teas-yang-path-computation], are still applicable when requesting WDM path computation and the models defined in this document only specifies the additional technology-specific attributes/information, using the attributes defined in [I-D.ietf-ccamp-rfc9093-bis].¶
The common characteristics for layer 0 (WSON and Flexi-grid) path computation are under definition in [I-D.ietf-ccamp-rfc9093-bis] and re-used in the ietf-wdm-path-computation YANG models.¶
As described in Section 4.2 of [RFC7699], there is some overlap between bandwidth and label in layer0.¶
The WSON and flexi-grid label resource information described in Section 2.4, is sufficient to describe also the spectrum resources within WSON and flexi-grid networks. Therefore, the model does not define any augmentation for the te-bandwidth containers defined in [I-D.ietf-teas-yang-path-computation].¶
The models augment all the occurrences of the label-restriction list with WSON and Flexi-grid technology-specific attributes using the l0-label-range-info and flexi-grid-label-range-info groupings defined in [I-D.ietf-ccamp-rfc9093-bis].¶
Moreover, the models augment all the occurrences of the te-label container with the WSON, Flexi-grid and OTN technology-specific attributes using the wson-label-start-end, wson-label-hop, wson-label-step, flexi-grid-label-start-end, flexi-grid-label-hop and flexi-grid-label-step defined in [I-D.ietf-ccamp-rfc9093-bis].¶
Figure 2 below shows the tree diagram of the YANG data model defined in module ietf-wdm-path-computation.yang.¶
module: ietf-wdm-path-computation
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:tunnel-attributes:
+-- wdm-constraint
+-- transceiver-constraint
| +-- operational-modes* string
| +-- tx-tune-constraints
| | +-- min-central-frequency? frequency-thz
| | +-- max-central-frequency? frequency-thz
| | +-- transceiver-tunability? frequency-ghz
| +-- line-coding-bitrate* identityref
| +-- tx-channel-power? l0-types:power-dbm
| +-- preferred-rx-channel-power? l0-types:power-dbm
+-- gsnr-extra-margin? snr
+-- use-regen? boolean
+-- wavelength-conversion? boolean
+-- wavelength-assignment? identityref
+-- guard-band-size? l0-types:frequency-thz
+-- matching-fwd-rev-wavelength? boolean
+-- allow-retuning? boolean
+-- delta-power? l0-types:power-ratio
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:optimizations/tepc:algorithm
/tepc:metric/tepc:optimization-metric
/tepc:explicit-route-exclude-objects
/tepc:route-object-exclude-object/tepc:type
/tepc:numbered-node-hop:
+-- path-in-transceiver
| +-- transponder-id? uint32
| +-- transceivers* [lane-id]
| +-- lane-id uint8
| +-- transceiver-id? uint32
| +-- operational-modes* string
| +-- tx-tune-constraints
| | +-- min-central-frequency? frequency-thz
| | +-- max-central-frequency? frequency-thz
| | +-- transceiver-tunability? frequency-ghz
| +-- line-coding-bitrate* identityref
| +-- tx-channel-power? l0-types:power-dbm
| +-- preferred-rx-channel-power? l0-types:power-dbm
+-- path-out-transceiver
+-- transponder-id? uint32
+-- transceivers* [lane-id]
+-- lane-id uint8
+-- transceiver-id? uint32
+-- operational-modes* string
+-- tx-tune-constraints
| +-- min-central-frequency? frequency-thz
| +-- max-central-frequency? frequency-thz
| +-- transceiver-tunability? frequency-ghz
+-- line-coding-bitrate* identityref
+-- tx-channel-power? l0-types:power-dbm
+-- preferred-rx-channel-power? l0-types:power-dbm
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:optimizations/tepc:algorithm
/tepc:metric/tepc:optimization-metric
/tepc:explicit-route-exclude-objects
/tepc:route-object-exclude-object/tepc:type:
+--:(oms-element)
+-- oms-element-uid? string
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:optimizations/tepc:algorithm
/tepc:metric/tepc:optimization-metric
/tepc:explicit-route-include-objects
/tepc:route-object-include-object/tepc:type
/tepc:numbered-node-hop:
+-- path-in-transceiver
| +-- transponder-id? uint32
| +-- transceivers* [lane-id]
| +-- lane-id uint8
| +-- transceiver-id? uint32
| +-- operational-modes* string
| +-- tx-tune-constraints
| | +-- min-central-frequency? frequency-thz
| | +-- max-central-frequency? frequency-thz
| | +-- transceiver-tunability? frequency-ghz
| +-- line-coding-bitrate* identityref
| +-- tx-channel-power? l0-types:power-dbm
| +-- preferred-rx-channel-power? l0-types:power-dbm
+-- path-out-transceiver
+-- transponder-id? uint32
+-- transceivers* [lane-id]
+-- lane-id uint8
+-- transceiver-id? uint32
+-- operational-modes* string
+-- tx-tune-constraints
| +-- min-central-frequency? frequency-thz
| +-- max-central-frequency? frequency-thz
| +-- transceiver-tunability? frequency-ghz
+-- line-coding-bitrate* identityref
+-- tx-channel-power? l0-types:power-dbm
+-- preferred-rx-channel-power? l0-types:power-dbm
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:optimizations/tepc:algorithm
/tepc:metric/tepc:optimization-metric
/tepc:explicit-route-include-objects
/tepc:route-object-include-object/tepc:type:
+--:(oms-element)
+-- oms-element-uid? string
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:explicit-route-objects
/tepc:route-object-exclude-always/tepc:type
/tepc:numbered-node-hop:
+-- path-in-transceiver
| +-- transponder-id? uint32
| +-- transceivers* [lane-id]
| +-- lane-id uint8
| +-- transceiver-id? uint32
| +-- operational-modes* string
| +-- tx-tune-constraints
| | +-- min-central-frequency? frequency-thz
| | +-- max-central-frequency? frequency-thz
| | +-- transceiver-tunability? frequency-ghz
| +-- line-coding-bitrate* identityref
| +-- tx-channel-power? l0-types:power-dbm
| +-- preferred-rx-channel-power? l0-types:power-dbm
+-- path-out-transceiver
+-- transponder-id? uint32
+-- transceivers* [lane-id]
+-- lane-id uint8
+-- transceiver-id? uint32
+-- operational-modes* string
+-- tx-tune-constraints
| +-- min-central-frequency? frequency-thz
| +-- max-central-frequency? frequency-thz
| +-- transceiver-tunability? frequency-ghz
+-- line-coding-bitrate* identityref
+-- tx-channel-power? l0-types:power-dbm
+-- preferred-rx-channel-power? l0-types:power-dbm
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:explicit-route-objects
/tepc:route-object-exclude-always/tepc:type:
+--:(oms-element)
+-- oms-element-uid? string
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:explicit-route-objects
/tepc:route-object-include-exclude/tepc:type
/tepc:numbered-node-hop:
+-- path-in-transceiver
| +-- transponder-id? uint32
| +-- transceivers* [lane-id]
| +-- lane-id uint8
| +-- transceiver-id? uint32
| +-- operational-modes* string
| +-- tx-tune-constraints
| | +-- min-central-frequency? frequency-thz
| | +-- max-central-frequency? frequency-thz
| | +-- transceiver-tunability? frequency-ghz
| +-- line-coding-bitrate* identityref
| +-- tx-channel-power? l0-types:power-dbm
| +-- preferred-rx-channel-power? l0-types:power-dbm
+-- path-out-transceiver
+-- transponder-id? uint32
+-- transceivers* [lane-id]
+-- lane-id uint8
+-- transceiver-id? uint32
+-- operational-modes* string
+-- tx-tune-constraints
| +-- min-central-frequency? frequency-thz
| +-- max-central-frequency? frequency-thz
| +-- transceiver-tunability? frequency-ghz
+-- line-coding-bitrate* identityref
+-- tx-channel-power? l0-types:power-dbm
+-- preferred-rx-channel-power? l0-types:power-dbm
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:explicit-route-objects
/tepc:route-object-include-exclude/tepc:type:
+--:(oms-element)
+-- oms-element-uid? string
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:synchronization/tepc:exclude-objects/tepc:excludes
/tepc:type/tepc:numbered-node-hop:
+-- path-in-transceiver
| +-- transponder-id? uint32
| +-- transceivers* [lane-id]
| +-- lane-id uint8
| +-- transceiver-id? uint32
| +-- operational-modes* string
| +-- tx-tune-constraints
| | +-- min-central-frequency? frequency-thz
| | +-- max-central-frequency? frequency-thz
| | +-- transceiver-tunability? frequency-ghz
| +-- line-coding-bitrate* identityref
| +-- tx-channel-power? l0-types:power-dbm
| +-- preferred-rx-channel-power? l0-types:power-dbm
+-- path-out-transceiver
+-- transponder-id? uint32
+-- transceivers* [lane-id]
+-- lane-id uint8
+-- transceiver-id? uint32
+-- operational-modes* string
+-- tx-tune-constraints
| +-- min-central-frequency? frequency-thz
| +-- max-central-frequency? frequency-thz
| +-- transceiver-tunability? frequency-ghz
+-- line-coding-bitrate* identityref
+-- tx-channel-power? l0-types:power-dbm
+-- preferred-rx-channel-power? l0-types:power-dbm
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:synchronization/tepc:exclude-objects/tepc:excludes
/tepc:type:
+--:(oms-element)
+-- oms-element-uid? string
augment /te:tunnels-path-compute/te:output/te:path-compute-result
/tepc:response/tepc:computed-paths-properties
/tepc:computed-path-properties/tepc:path-properties:
+--ro estimated-gsnr? snr
+--ro estimated-eol-gsnr? snr
+--ro estimated-lowest-gsnr? snr
augment /te:tunnels-path-compute/te:output/te:path-compute-result
/tepc:response/tepc:computed-paths-properties
/tepc:computed-path-properties/tepc:path-properties
/tepc:path-route-objects/tepc:path-route-object/tepc:type
/tepc:numbered-node-hop:
+--ro path-in-transceiver
| +--ro transponder-id? uint32
| +--ro transceivers* [lane-id]
| +--ro lane-id uint8
| +--ro transceiver-id? uint32
| +--ro operational-modes* string
| +--ro tx-tune-constraints
| | +--ro min-central-frequency? frequency-thz
| | +--ro max-central-frequency? frequency-thz
| | +--ro transceiver-tunability? frequency-ghz
| +--ro line-coding-bitrate* identityref
| +--ro tx-channel-power? l0-types:power-dbm
| +--ro preferred-rx-channel-power? l0-types:power-dbm
+--ro path-out-transceiver
+--ro transponder-id? uint32
+--ro transceivers* [lane-id]
+--ro lane-id uint8
+--ro transceiver-id? uint32
+--ro operational-modes* string
+--ro tx-tune-constraints
| +--ro min-central-frequency? frequency-thz
| +--ro max-central-frequency? frequency-thz
| +--ro transceiver-tunability? frequency-ghz
+--ro line-coding-bitrate* identityref
+--ro tx-channel-power? l0-types:power-dbm
+--ro preferred-rx-channel-power? l0-types:power-dbm
augment /te:tunnels-path-compute/te:output/te:path-compute-result
/tepc:response/tepc:computed-paths-properties
/tepc:computed-path-properties/tepc:path-properties
/tepc:path-route-objects/tepc:path-route-object
/tepc:type:
+--:(oms-element)
+--ro oms-element-uid? string
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:path-in-segment
/tepc:label-restrictions/tepc:label-restriction:
+-- grid-type? identityref
+-- priority? uint8
+-- flexi-grid
+-- slot-width-granularity? identityref
+-- min-slot-width-factor? uint16
+-- max-slot-width-factor? uint16
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:path-out-segment
/tepc:label-restrictions/tepc:label-restriction:
+-- grid-type? identityref
+-- priority? uint8
+-- flexi-grid
+-- slot-width-granularity? identityref
+-- min-slot-width-factor? uint16
+-- max-slot-width-factor? uint16
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:optimizations/tepc:algorithm
/tepc:metric/tepc:optimization-metric
/tepc:explicit-route-exclude-objects
/tepc:route-object-exclude-object/tepc:type/tepc:label
/tepc:label-hop/tepc:te-label/tepc:technology:
+--:(wdm)
+-- (grid-type)?
+--:(fixed-dwdm)
| +-- (fixed-single-or-super-channel)?
| +--:(single)
| | +-- dwdm-n? l0-types:dwdm-n
| +--:(multi)
| +-- subcarrier-dwdm-n* l0-types:dwdm-n
+--:(cwdm)
| +-- cwdm-n? l0-types:cwdm-n
+--:(flexi-grid)
+-- (single-or-super-channel)?
+--:(single)
| +-- flexi-n? l0-types:flexi-n
| +-- flexi-m? l0-types:flexi-m
x--:(super)
| x-- subcarrier-flexi-n* [flexi-n]
| +-- flexi-n l0-types:flexi-n
| +-- flexi-m? l0-types:flexi-m
+--:(multi)
+-- frequency-slots
+-- frequency-slot* [flexi-n]
+-- flexi-n l0-types:flexi-n
+-- flexi-m? l0-types:flexi-m
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:optimizations/tepc:algorithm
/tepc:metric/tepc:optimization-metric
/tepc:explicit-route-include-objects
/tepc:route-object-include-object/tepc:type/tepc:label
/tepc:label-hop/tepc:te-label/tepc:technology:
+--:(wdm)
+-- (grid-type)?
+--:(fixed-dwdm)
| +-- (fixed-single-or-super-channel)?
| +--:(single)
| | +-- dwdm-n? l0-types:dwdm-n
| +--:(multi)
| +-- subcarrier-dwdm-n* l0-types:dwdm-n
+--:(cwdm)
| +-- cwdm-n? l0-types:cwdm-n
+--:(flexi-grid)
+-- (single-or-super-channel)?
+--:(single)
| +-- flexi-n? l0-types:flexi-n
| +-- flexi-m? l0-types:flexi-m
x--:(super)
| x-- subcarrier-flexi-n* [flexi-n]
| +-- flexi-n l0-types:flexi-n
| +-- flexi-m? l0-types:flexi-m
+--:(multi)
+-- frequency-slots
+-- frequency-slot* [flexi-n]
+-- flexi-n l0-types:flexi-n
+-- flexi-m? l0-types:flexi-m
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:explicit-route-objects
/tepc:route-object-exclude-always/tepc:type/tepc:label
/tepc:label-hop/tepc:te-label/tepc:technology:
+--:(wdm)
+-- (grid-type)?
+--:(fixed-dwdm)
| +-- (fixed-single-or-super-channel)?
| +--:(single)
| | +-- dwdm-n? l0-types:dwdm-n
| +--:(multi)
| +-- subcarrier-dwdm-n* l0-types:dwdm-n
+--:(cwdm)
| +-- cwdm-n? l0-types:cwdm-n
+--:(flexi-grid)
+-- (single-or-super-channel)?
+--:(single)
| +-- flexi-n? l0-types:flexi-n
| +-- flexi-m? l0-types:flexi-m
x--:(super)
| x-- subcarrier-flexi-n* [flexi-n]
| +-- flexi-n l0-types:flexi-n
| +-- flexi-m? l0-types:flexi-m
+--:(multi)
+-- frequency-slots
+-- frequency-slot* [flexi-n]
+-- flexi-n l0-types:flexi-n
+-- flexi-m? l0-types:flexi-m
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:explicit-route-objects
/tepc:route-object-include-exclude/tepc:type/tepc:label
/tepc:label-hop/tepc:te-label/tepc:technology:
+--:(wdm)
+-- (grid-type)?
+--:(fixed-dwdm)
| +-- (fixed-single-or-super-channel)?
| +--:(single)
| | +-- dwdm-n? l0-types:dwdm-n
| +--:(multi)
| +-- subcarrier-dwdm-n* l0-types:dwdm-n
+--:(cwdm)
| +-- cwdm-n? l0-types:cwdm-n
+--:(flexi-grid)
+-- (single-or-super-channel)?
+--:(single)
| +-- flexi-n? l0-types:flexi-n
| +-- flexi-m? l0-types:flexi-m
x--:(super)
| x-- subcarrier-flexi-n* [flexi-n]
| +-- flexi-n l0-types:flexi-n
| +-- flexi-m? l0-types:flexi-m
+--:(multi)
+-- frequency-slots
+-- frequency-slot* [flexi-n]
+-- flexi-n l0-types:flexi-n
+-- flexi-m? l0-types:flexi-m
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:path-in-segment
/tepc:label-restrictions/tepc:label-restriction
/tepc:label-start/tepc:te-label/tepc:technology:
+--:(wdm)
+-- (grid-type)?
+--:(fixed-dwdm)
| +-- dwdm-n? l0-types:dwdm-n
+--:(cwdm)
| +-- cwdm-n? l0-types:cwdm-n
+--:(flexi-grid)
+-- flexi-n? l0-types:flexi-n
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:path-in-segment
/tepc:label-restrictions/tepc:label-restriction
/tepc:label-end/tepc:te-label/tepc:technology:
+--:(wdm)
+-- (grid-type)?
+--:(fixed-dwdm)
| +-- dwdm-n? l0-types:dwdm-n
+--:(cwdm)
| +-- cwdm-n? l0-types:cwdm-n
+--:(flexi-grid)
+-- flexi-n? l0-types:flexi-n
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:path-in-segment
/tepc:label-restrictions/tepc:label-restriction
/tepc:label-step/tepc:technology:
+--:(wdm)
+-- (l0-grid-type)?
+--:(fixed-dwdm)
| +-- wson-dwdm-channel-spacing? identityref
+--:(cwdm)
| +-- wson-cwdm-channel-spacing? identityref
+--:(flexi-grid)
x-- flexi-grid-channel-spacing? identityref
+-- flexi-ncfg? identityref
+-- flexi-n-step? uint8
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:path-out-segment
/tepc:label-restrictions/tepc:label-restriction
/tepc:label-start/tepc:te-label/tepc:technology:
+--:(wdm)
+-- (grid-type)?
+--:(fixed-dwdm)
| +-- dwdm-n? l0-types:dwdm-n
+--:(cwdm)
| +-- cwdm-n? l0-types:cwdm-n
+--:(flexi-grid)
+-- flexi-n? l0-types:flexi-n
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:path-out-segment
/tepc:label-restrictions/tepc:label-restriction
/tepc:label-end/tepc:te-label/tepc:technology:
+--:(wdm)
+-- (grid-type)?
+--:(fixed-dwdm)
| +-- dwdm-n? l0-types:dwdm-n
+--:(cwdm)
| +-- cwdm-n? l0-types:cwdm-n
+--:(flexi-grid)
+-- flexi-n? l0-types:flexi-n
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:path-request/tepc:path-out-segment
/tepc:label-restrictions/tepc:label-restriction
/tepc:label-step/tepc:technology:
+--:(wdm)
+-- (l0-grid-type)?
+--:(fixed-dwdm)
| +-- wson-dwdm-channel-spacing? identityref
+--:(cwdm)
| +-- wson-cwdm-channel-spacing? identityref
+--:(flexi-grid)
x-- flexi-grid-channel-spacing? identityref
+-- flexi-ncfg? identityref
+-- flexi-n-step? uint8
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/tepc:synchronization/tepc:exclude-objects/tepc:excludes
/tepc:type/tepc:label/tepc:label-hop/tepc:te-label
/tepc:technology:
+--:(wdm)
+-- (grid-type)?
+--:(fixed-dwdm)
| +-- (fixed-single-or-super-channel)?
| +--:(single)
| | +-- dwdm-n? l0-types:dwdm-n
| +--:(multi)
| +-- subcarrier-dwdm-n* l0-types:dwdm-n
+--:(cwdm)
| +-- cwdm-n? l0-types:cwdm-n
+--:(flexi-grid)
+-- (single-or-super-channel)?
+--:(single)
| +-- flexi-n? l0-types:flexi-n
| +-- flexi-m? l0-types:flexi-m
x--:(super)
| x-- subcarrier-flexi-n* [flexi-n]
| +-- flexi-n l0-types:flexi-n
| +-- flexi-m? l0-types:flexi-m
+--:(multi)
+-- frequency-slots
+-- frequency-slot* [flexi-n]
+-- flexi-n l0-types:flexi-n
+-- flexi-m? l0-types:flexi-m
augment /te:tunnels-path-compute/te:output/te:path-compute-result
/tepc:response/tepc:computed-paths-properties
/tepc:computed-path-properties/tepc:path-properties
/tepc:path-route-objects/tepc:path-route-object/tepc:type
/tepc:label/tepc:label-hop/tepc:te-label/tepc:technology:
+--:(wdm)
+--ro (grid-type)?
+--:(fixed-dwdm)
| +--ro (fixed-single-or-super-channel)?
| +--:(single)
| | +--ro dwdm-n? l0-types:dwdm-n
| +--:(multi)
| +--ro subcarrier-dwdm-n* l0-types:dwdm-n
+--:(cwdm)
| +--ro cwdm-n? l0-types:cwdm-n
+--:(flexi-grid)
+--ro (single-or-super-channel)?
+--:(single)
| +--ro flexi-n? l0-types:flexi-n
| +--ro flexi-m? l0-types:flexi-m
x--:(super)
| x--ro subcarrier-flexi-n* [flexi-n]
| +--ro flexi-n l0-types:flexi-n
| +--ro flexi-m? l0-types:flexi-m
+--:(multi)
+--ro frequency-slots
+--ro frequency-slot* [flexi-n]
+--ro flexi-n l0-types:flexi-n
+--ro flexi-m? l0-types:flexi-m
<CODE BEGINS> file "ietf-wdm-path-computation@2024-02-29.yang"
module ietf-wdm-path-computation {
yang-version 1.1;
namespace
"urn:ietf:params:xml:ns:yang:ietf-wdm-path-computation";
prefix "wdm-pc";
import ietf-te-path-computation {
prefix "tepc";
reference
"I-D.ietf-teas-yang-path-computation-22: Yang model
for requesting Path Computation.";
}
import ietf-te {
prefix "te";
reference
"I-D.ietf-teas-yang-te-36: A YANG Data Model for Traffic
Engineering Tunnels and Interfaces.";
}
import ietf-layer0-types {
prefix "l0-types";
reference
"I-D.ietf-ccamp-rfc9093-bis: A YANG Data Model for Layer 0
Types.";
}
import ietf-wdm-tunnel {
prefix "wdm-tnl";
reference
"I-D.ietf-wdm-tunnel: A YANG Data Model for WDM Tunnels.";
}
organization
"IETF CCAMP Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/ccamp/>
WG List: <mailto:ccamp@ietf.org>
Editor: Aihua Guo
<mailto:aihuaguo.ietf@gmail.com>
Editor: Italo Busi
<mailto:italo.busi@huawei.com>
Editor: Sergio Belotti
<mailto:sergio.belotti@nokia.com>";
description
"This module defines a model for requesting
WDM Path Computation.
The model fully conforms to the Network Management
Datastore Architecture (NMDA).
Copyright (c) 2022 IETF Trust and the persons
identified as authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the Revised BSD License
set forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX; see
the RFC itself for full legal notices.";
revision "2024-02-29" {
description
"Initial version.";
reference
"RFC XXXX: YANG Data Models for requesting Path Computation
in Optical Networks.";
// RFC Ed.: replace XXXX with actual RFC number, update date
// information and remove this note
}
/*
* Data nodes
*/
/*
* Augment tunnel attributes
*/
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:tunnel-attributes" {
description
"Augment with WDM tunnel-specific constraints.";
uses wdm-tnl:wdm-constraint;
}
/*
* Augment path computation request
*/
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:optimizations/tepc:algorithm/"
+ "tepc:metric/tepc:optimization-metric/"
+ "tepc:explicit-route-exclude-objects/"
+ "tepc:route-object-exclude-object/tepc:type/"
+ "tepc:numbered-node-hop" {
description
"Augment with transceiver configurations.";
uses wdm-tnl:path-transceiver-config;
}
//???
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:optimizations/tepc:algorithm/"
+ "tepc:metric/tepc:optimization-metric/"
+ "tepc:explicit-route-exclude-objects/"
+ "tepc:route-object-exclude-object/tepc:type" {
description
"Augment the route hop for the optimization of the explicit
route objects excluded by the path computation of the requested
path.";
case oms-element {
leaf oms-element-uid {
type string;
description
"The unique id of the OMS element.";
}
description
"The OMS element route hop type";
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:optimizations/tepc:algorithm/"
+ "tepc:metric/tepc:optimization-metric/"
+ "tepc:explicit-route-include-objects/"
+ "tepc:route-object-include-object/tepc:type/"
+ "tepc:numbered-node-hop" {
description
"Augment with transceiver configurations.";
uses wdm-tnl:path-transceiver-config;
}
//???
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:optimizations/tepc:algorithm/"
+ "tepc:metric/tepc:optimization-metric/"
+ "tepc:explicit-route-include-objects/"
+ "tepc:route-object-include-object/tepc:type" {
description
"Augment the route hop for the optimization of the explicit
route objects included by the path computation of the requested
path.";
case oms-element {
leaf oms-element-uid {
type string;
description
"The unique id of the OMS element.";
}
description
"The OMS element route hop type";
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:explicit-route-objects/"
+ "tepc:route-object-exclude-always/tepc:type/"
+ "tepc:numbered-node-hop" {
description
"Augment with transceiver configurations.";
uses wdm-tnl:path-transceiver-config;
}
//???
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:explicit-route-objects/"
+ "tepc:route-object-exclude-always/tepc:type" {
description
"Augment the route hop for the explicit route objects always
excluded by the path computation of the requested path.";
case oms-element {
leaf oms-element-uid {
type string;
description
"The unique id of the OMS element.";
}
description
"The OMS element route hop type";
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:explicit-route-objects/"
+ "tepc:route-object-include-exclude/tepc:type/"
+ "tepc:numbered-node-hop" {
description
"Augment with transceiver configurations.";
uses wdm-tnl:path-transceiver-config;
}
//???
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:explicit-route-objects/"
+ "tepc:route-object-include-exclude/tepc:type" {
description
"Augment the route hop for the explicit route objects included
or excluded by the path computation of the requested path.";
case oms-element {
leaf oms-element-uid {
type string;
description
"The unique id of the OMS element.";
}
description
"The OMS element route hop type";
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:synchronization/tepc:exclude-objects/tepc:excludes/"
+ "tepc:type/tepc:numbered-node-hop" {
description
"Augment with transceiver configurations.";
uses wdm-tnl:path-transceiver-config;
}
//???
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:synchronization/tepc:exclude-objects/tepc:excludes/"
+ "tepc:type" {
description
"Augment the route hop for the explicit route objects to always
exclude from synchronized path computation.";
case oms-element {
leaf oms-element-uid {
type string;
description
"The unique id of the OMS element.";
}
description
"The OMS element route hop type";
}
}
/*
* Augment path computation response
*/
augment "/te:tunnels-path-compute/te:output/"
+ "te:path-compute-result/tepc:response/"
+ "tepc:computed-paths-properties/"
+ "tepc:computed-path-properties/tepc:path-properties" {
description
"Augment with additional properties for WDM paths.";
uses l0-types:l0-path-properties;
}
augment "/te:tunnels-path-compute/te:output/"
+ "te:path-compute-result/tepc:response/"
+ "tepc:computed-paths-properties/"
+ "tepc:computed-path-properties/tepc:path-properties/"
+ "tepc:path-route-objects/tepc:path-route-object/"
+ "tepc:type/tepc:numbered-node-hop" {
description
"Augment with transceiver configurations.";
uses wdm-tnl:path-transceiver-config;
}
//???
augment "/te:tunnels-path-compute/te:output/"
+ "te:path-compute-result/tepc:response/"
+ "tepc:computed-paths-properties/"
+ "tepc:computed-path-properties/tepc:path-properties/"
+ "tepc:path-route-objects/tepc:path-route-object/"
+ "tepc:type" {
description
"Augment the route hop for the route object of the computed
path.";
case oms-element {
leaf oms-element-uid {
type string;
description
"The unique id of the OMS element.";
}
description
"The OMS element route hop type";
}
}
/*
* Augment TE label range information
*/
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:path-in-segment/"
+ "tepc:label-restrictions/tepc:label-restriction" {
description
"Augment TE label range information for the ingress segment
of the requested path.";
uses l0-types:wdm-label-range-info;
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:path-out-segment/"
+ "tepc:label-restrictions/tepc:label-restriction" {
description
"Augment TE label range information for the egress segment
of the requested path.";
uses l0-types:wdm-label-range-info;
}
/*
* Augment TE label.
*/
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:optimizations/tepc:algorithm/"
+ "tepc:metric/tepc:optimization-metric/"
+ "tepc:explicit-route-exclude-objects/"
+ "tepc:route-object-exclude-object/tepc:type/tepc:label/"
+ "tepc:label-hop/tepc:te-label/tepc:technology" {
description
"Augment TE label hop for the optimization of the explicit
route objects excluded by the path computation of the requested
path.";
case wdm {
uses l0-types:wdm-label-hop;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:optimizations/tepc:algorithm/"
+ "tepc:metric/tepc:optimization-metric/"
+ "tepc:explicit-route-include-objects/"
+ "tepc:route-object-include-object/tepc:type/tepc:label/"
+ "tepc:label-hop/tepc:te-label/tepc:technology" {
description
"Augment TE label hop for the optimization of the explicit
route objects included by the path computation of the requested
path.";
case wdm {
uses l0-types:wdm-label-hop;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:explicit-route-objects/"
+ "tepc:route-object-exclude-always/tepc:type/tepc:label/"
+ "tepc:label-hop/tepc:te-label/tepc:technology" {
description
"Augment TE label hop for the explicit route objects always
excluded by the path computation of the requested path.";
case wdm {
uses l0-types:wdm-label-hop;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:explicit-route-objects/"
+ "tepc:route-object-include-exclude/tepc:type/tepc:label/"
+ "tepc:label-hop/tepc:te-label/tepc:technology" {
description
"Augment TE label hop for the explicit route objects included
or excluded by the path computation of the requested path.";
case wdm {
uses l0-types:wdm-label-hop;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:path-in-segment/"
+ "tepc:label-restrictions/tepc:label-restriction/"
+ "tepc:label-start/tepc:te-label/tepc:technology" {
description
"Augment TE label range start for the ingress segment
of the requested path.";
case wdm {
uses l0-types:wdm-label-start-end;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:path-in-segment/"
+ "tepc:label-restrictions/tepc:label-restriction/"
+ "tepc:label-end/tepc:te-label/tepc:technology" {
description
"Augment TE label range end for the ingress segment
of the requested path.";
case wdm {
uses l0-types:wdm-label-start-end;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:path-in-segment/"
+ "tepc:label-restrictions/tepc:label-restriction/"
+ "tepc:label-step/tepc:technology" {
description
"Augment TE label range step for the ingress segment
of the requested path.";
case wdm {
uses l0-types:wdm-label-step;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:path-out-segment/"
+ "tepc:label-restrictions/tepc:label-restriction/"
+ "tepc:label-start/tepc:te-label/tepc:technology" {
description
"Augment TE label range start for the egress segment
of the requested path.";
case wdm {
uses l0-types:wdm-label-start-end;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:path-out-segment/"
+ "tepc:label-restrictions/tepc:label-restriction/"
+ "tepc:label-end/tepc:te-label/tepc:technology" {
description
"Augment TE label range end for the egress segment
of the requested path.";
case wdm {
uses l0-types:wdm-label-start-end;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:path-request/tepc:path-out-segment/"
+ "tepc:label-restrictions/tepc:label-restriction/"
+ "tepc:label-step/tepc:technology" {
description
"Augment TE label range end for the egress segment
of the requested path.";
case wdm {
uses l0-types:wdm-label-step;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "tepc:synchronization/tepc:exclude-objects/tepc:excludes/"
+ "tepc:type/tepc:label/tepc:label-hop/"
+ "tepc:te-label/tepc:technology" {
description
"Augment TE label hop for the explicit route objects to always
exclude from synchronized path computation.";
case wdm {
uses l0-types:wdm-label-hop;
}
}
augment "/te:tunnels-path-compute/te:output/"
+ "te:path-compute-result/tepc:response/"
+ "tepc:computed-paths-properties/"
+ "tepc:computed-path-properties/tepc:path-properties/"
+ "tepc:path-route-objects/tepc:path-route-object/"
+ "tepc:type/tepc:label/"
+ "tepc:label-hop/tepc:te-label/tepc:technology" {
description
"Augment TE label hop for the route object of the computed
path.";
case wdm {
uses l0-types:wdm-label-hop;
}
}
}
<CODE ENDS>
This document provides a method for requesting path computations for WSON and Flexi-Grid tunnels. Consideration of mechanisms to gather and collate information required for the path computations will be necessary. Furthermore, storing path computation requests and responses and triggering actions will also need to be carefully managed and secured.¶
Future versions of this document will contain additional information.¶
The YANG module defined in this document will be accessed via the NETCONF protocol [RFC6241] or RESTCONF protocol [RFC8040]. The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS and the mandatory-to-implement secure transport is TLS [RFC8446].¶
The Network Configuration Access Control Model (NACM) [RFC8341] provides the means to restrict access to particular NETCONF or RESTCONF users to a pre-configured subset of all available NETCONF or RESTCONF protocol operations and content.¶
Some of the RPC operations defined in this YANG module may be considered sensitive or vulnerable in some network environments. It is thus essential to control access to these operations.¶
Operations defined in this document, and their sensitivities and possible vulnerabilities, will be discussed further in future versions of this document.¶
This document registers the following URIs in the "ns" subregistry within the "IETF XML registry" [RFC3688].¶
URI: urn:ietf:params:xml:ns:yang:ietf-wdm-path-computation Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace.¶
This document registers the following YANG module in the "YANG Module Names" registry [RFC7950].¶
name: ietf-wdm-path-computation namespace: urn:ietf:params:xml:ns:yang:ietf-wson-path-computation prefix: wdm-pc reference: this document¶
The initial YANG data model requesting path computation in optical networks was draft-gbb-ccamp-optical-path-computation-yang-00. This document included path computation request capabilities for WSON, Flexi-Grid and OTN technologies. However, it was proposed at IETF 113 (March 25, 2022) to split the initial document into separate documents for WDM (WSON and Flexi-Grid) and OTN technologies, as each technology may be developed and implemented separately.¶
The WDM technology capabilities were kept in this document, and the OTN capabilities were moved into [I-D.draft-gbb-ccamp-otn-path-computation-yang].¶
Editors note, please remove this appendix before publication.¶
The authors of this document would like to thank the authors of [I-D.ietf-teas-actn-poi-applicability] for having identified the gap and requirements to trigger this work.¶
The authors of this document would also like to thank Young Lee, Haomian Zheng, Victor Lopex, Ricard Vilalta, Bin Yeong Yoon, Jorge E. Lopez de Vergara Mendez, Daniel Perdices Burrero, Oscar Gonzalez de Dios, Gabriele Galimberti, Zafar Ali, Daniel Michaud Vallinoto and Dhruv Dhody who have contributed to the development of path computation augmentations for WSON and Flexi-grid topology in earlier versions of [I-D.ietf-ccamp-wson-tunnel-model] and of [I-D.ietf-ccamp-flexigrid-tunnel-yang].¶
This document was prepared using kramdown.¶