Internet Engineering Task Force G. Galimberti, Ed.
Internet-Draft Cisco
Intended status: Informational J. Bouquier, Ed.
Expires: 27 April 2023 Vodafone
O. Gerstel, Ed.
B. Foster, Ed.
Cisco
D. Ceccarelli, Ed.
Ericsson
24 October 2022
Applicability of Abstraction and Control of Traffic Engineered Networks
(ACTN) to Packet Optical Integration (POI) extensions to support Router
Optical interfaces.
draft-mix-teas-actn-poi-extension-00
Abstract
This document extends the draft-ietf-teas-actn-poi-applicability to
the use case where the DWDM optical coherent interface is equipped on
the Packet device. It identifies the YANG data models being defined
by the IETF to support this deployment architecture and specific
scenarios relevant for Service Providers. Existing IETF protocols
and data models are identified for each multi-layer (packet over
optical) scenario with a specific focus on the MPI (Multi-Domain
Service Coordinator to Provisioning Network Controllers Interface)in
the ACTN architecture.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 27 April 2023.
Galimberti, et al. Expires 27 April 2023 [Page 1]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
Copyright Notice
Copyright (c) 2022 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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Reference architecture and network scenario . . . . . . . . . 4
3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1. Inter Layer Link discovery and provisioning . . . . . . . 8
3.2. Network topology discovery and provisioning . . . . . . . 9
3.3. End to End service provisioning / deletion . . . . . . . 10
3.4. Optical Circuit provisioning / deletion . . . . . . . . . 12
3.5. LAG extension . . . . . . . . . . . . . . . . . . . . . . 14
3.6. Optical Restoration . . . . . . . . . . . . . . . . . . . 14
3.7. Network Maintenance Operations . . . . . . . . . . . . . 15
4. Optical Interface for external transponder in a WDM
network . . . . . . . . . . . . . . . . . . . . . . . . . 15
5. Structure of the Yang Module . . . . . . . . . . . . . . . . 15
6. Security Considerations . . . . . . . . . . . . . . . . . . . 15
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 16
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 17
9.1. Normative References . . . . . . . . . . . . . . . . . . 17
9.2. Informative References . . . . . . . . . . . . . . . . . 19
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 19
1. Introduction
The full automation of the multilayer/multidomain network is a topic
of high importance in the industry and the service providers
community. Typically, the layers composing such network are the IP/
MPLS, (with Segment Routing) and the Optical ones. The requirements
of high bandwidth availability and dynamic control of the networks
are of capital importance too. The draft-ietf-teas-actn-poi-
applicability specifies very well how to control and manage
multilayer/multidomain networks using the Abstraction and Control of
TE Networks (ACTN) architecture, see also Figure 1 .
Galimberti, et al. Expires 27 April 2023 [Page 2]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
New DWDM Coherent pluggable optics, such as ZR [OIF-400ZR-01-0] and
ZR+ [Open_ZR-Plus_MSA], are enabling new multilayer network use cases
where the DWDM interface is located within the packet domain
equipment instead of being part of the Optical domain Figure 2 .
ZR and ZR+ (and also CFP2-DCO) deployment in routers has already
started and are expanding significantly. The way the DWDM pluggable
are in general managed is not yet completely specified and defined by
any standard and it is becoming an urgent matter to cover for Service
Providers. Full end-to-end management solution of these DWDM
coherent pluggable optics, leveraging on ACTN hierarchical
architecture, is becoming critical to allow a wider deployment beyond
simple point-to-point high capacity link scenarios between two IP/
MPLS routers.
Figure 1 The ACTN architecture, defined in [RFC8453], is used to
control the multi-domain network shown in Figure 2 , where each
Packet PNC (P-PNC) is responsible for controlling its IP domain,
which can be either an Autonomous System (AS), [RFC1930], or an IGP
area within the same operator network. Each Optical PNC (O-PNC) in
the below topology is responsible for controlling its own Optical
Domain.
+----------+
| MDSC |
+-----+----+
|
MPI interf. +-----------+-----+------+-----------+
| | | |
+----+----+ +----+----+ +----+----+ +----+----+
| P-PNC 1 | | O-PNC 1 | | O-PNC 2 | | P-PNC 2 |
+----+----+ +----+----+ +----+----+ +----+----+
| | | |
| \ / |
+-------------------+ \ / +-------------------+
CE1 / P.N.1 P.N.2 \ | / / P.N.3 P.N.4 \ CE2
o--/---o o---\-|-------|--/---o o---\--o
\ : : / | | \ : : /
\ : PKT Domain 1 : / | | \ : PKT Domain 2 : /
+-:---------------:-+ | | +-:---------------:-+
: : | | : :
: : | | : :
+-:---------------:------+ +-------:---------------:--+
/ : : \ / : : \
/ o...............o O.N. \ / O.N. o...............o \
\ Optical Domain 1 / \ Optical Domain 2 /
\ / \ /
+------------------------+ +--------------------------+
Galimberti, et al. Expires 27 April 2023 [Page 3]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
Figure 1: Reference multilayer/multidomain Scenario
Figure 2 shows how the Packet Node DWDM coherent Ports are connected
to the ROADM ports.
+------+ +------+ _________ +------+ +------+
|P.N.1 | | O.N. | / /\ | O.N. | |P.N.2 |
| P1| ----- | || | || | ----- |P1 |
==| P2| ----- | ||Optical | || | ----- |P2 |==
==| P3| ----- | ||Network | || | ----- |P3 |==
| P4| ----- | || | || | ----- |P4 |
| | | ROADM| \________\/ | ROADM| | |
+------+ +------+ +------+ +------+
Packet Optical Packet
Layer Layer Layer
P.N. = Packet Node (ROADM)
O.N. = Optical DWDM Node
ROADM = Lambda/Spectrum switch
Px = DWDM (coherent pluggable) Router ports
Figure 2: Cross layer interconnection
2. Reference architecture and network scenario
As described in Figure 1 and according to the Packet Optical
Integration (POI) draft [draft-ietf-teas-actn-poi-applicability] in
which ACTN hierarchy is deployed [RFC8453], the PNCs are in charge to
control a single domain (e.g. Packet or Optical) while the MDSC is
responsible to coordinate the operations across the different domains
having the visibility of the whole network multi-domain and multi-
layer network topolgy.
A specific standard interface (MPI) allows the MDSC to interact with
the different Provisioning Network Controller (O/P-PNCs). Although
the MPI interface should present an abstracted topology to the MDSC
(hiding technology-specific aspects of the network and hiding
topology details depending on the policy chosen) in the case of DWDM
coherent pluggable located in the PN some information related to the
physical component must be shared on MPI. The above statement is
assumed as the Domain PNC (e.g. O-PNC) may not be able to get
information from or set parameters to a node belonging to a different
domain (e.g. P-PNC).
The reason of this change is due to the following statements:
Galimberti, et al. Expires 27 April 2023 [Page 4]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
O-PNC routing and wavelength assignment
The MDSC can ask the O-PNC to set an optical circuit between two
ROADM ports (A and Z). The O-PNC having the full Optical Topology
network knowledge can calculate the Optical Path, the wavelength
assignment (RWA), etc. K-circuits may be calculated and sorted
based on some parameters (e.g. number of hops, path length, OSNR,
etc.)
Optical Circuit Feasibility
O-PNC can calculate the estimated OSNR for the A to Z circuits and
sort them from the best to the worse performance or select the
most suitable performance circuit. To verify the circuit
feasibility the O-PNC needs to know the Transceiver optical
characteristics, e.g. OSNR Robustness, DC capability, supported
PDL, FEC, etc. For more details refer to draft-ietf-ccamp-dwdm-
if-param-yang. The above parameters may not be directly retrieved
from Packet Node by the O-PNC, (e.g. because the Packet Node
supports only proprietary models or the Packet Nodes is not able
to support dual writing operation), then they must be read by the
P-PNC, shared to MDSC via MPI and finally to O-PNC. Other
parameters like central frequency and transmit power are
calculated by the O-PNC and must be provisioned to the Pluggable
optics when the circuit is set-up.
Central frequency
After having verified the Circuit Optical feasibility the O-PNC
shares the channel central frequency to MDSC so that the MDSC can
ask P-PNC to provision the Lambda to Router Pluggable.
FEC Coding
This parameter indicate what Forward Error Correction (FEC) code
is used at Ss and Rs (R/W) (not mentioned in G.698.2), it is used
by the O-PNC to calculate the optical feasibility. The FEC coding
list (FEC can be many) supported by the pluggable is an input for
O-PNC, one coding is selected for a specific circuit and is shared
(as output) to MDSC for pluggable provisioning.
Modulation format
This parameter indicates the list of supported Modulation Formats
and the provisioned Modulation Format. It is an input for O-PNC
Transmitter Output power
This parameter provisions the Transceiver Output power.
Receiver input power range
This parameter is the Min and Max input power supported by the
Transceiver, i.e. Receiver Sensitivity. It is an input for O-PNC
to properly calculate the optical power to set at ROADM port
Galimberti, et al. Expires 27 April 2023 [Page 5]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
Receiver input power
This parameter is the measured input power at the receiver. It is
an input for O-PNC to properly check the patchcord (between
transceiver and ROADM) loss comparing it with the ROADM port
received power.
operational-mode
In order to make the MPI communication more efficient and improve
the abstraction, the above (and more) parameters can be summarised
by the operational-mode parameter. The operational-mode can be
either standard ("application code" defined by ITU-T G.698.2) or
organization/vendor specific. In both cases are strings of
characters defined by ITU-T or by vendors. A pluggable may
support several operational modes, those values are collected by
the P-PNC and notified to O-PNC through the MDSC. They are used,
by O-PNC, to check the circuit optical feasibility. For each
transceiver the O-PNC will select only one operational-mode to be
set, together with central frequency and TX power, in the
pluggable though MDSC and P-PNC.
The above optocal parameters are related to the Edge Node Transceiver
and are used by the Optical Network control plane in order to
calculate the optical feasibility and the spectrum allocation. The
parameters are read by the P-PNC from the DWDM pluggable and shared
with MDSC to give the visibility of the pluggable characteristics.
MDSC can use the info to understand the client capabolity and, again,
share the same info to O-PNC for the impairment verification. On the
opposite direction O-PNC can send to MDSC the values (e.g.
operational mode, lambda, TX power) to provision the Client (Packet)
DWDM Pluggable. The pluggable provisioning will be done by the
P-PNC. For more details on the optical interface parameters see:
[I-D.ietf-ccamp-dwdm-if-param-yang].
In summary the pluggable parameters exchanged by P-PNC, MDSC
and O-PNC for end to end service provisioning are:
- Pluggable Service source port-ID
- Pluggable Service destination port-ID
- Central Frequency (Lambda) (common to source and destination)
- TX Output power (source port-ID)
- TX Output power (destination port-ID)
- Operational-mode (compatible)
- Vendor OUI (if the operational mode in not standard)
- Pluggable part number (if the operational mode in not standard)
- Admin-state (common ?)
Galimberti, et al. Expires 27 April 2023 [Page 6]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
3. Use Cases
The different services supported by the network are shown in
Figure 3. This draft is focused on the inter-layer link, the DCO
links setting through the MC-links setting although the POI first
goal is to set an IP service.
Figure 3
+-------------+ +-------------+
| IP | | IP |
| | IP-link | |
| <-------------------------------------------------------> |
| | | |
| | | |
| +-------+ | Eth-link | +-------+ |
| | <---------------------------------------------------> | |
| | | | | | | |
| | | | DCO-link | | | |
| | DCO <-------------------------------------------> DCO | |
+--+-------+--+ +--+-------+--+
^ ^
| +-------+ +-------+ |
| | OLS | | OLS | |
| | | | | |
+-----> | <-----------------------------> |<------+
inter-layer | | MC-link | | inter-layer
link | | | | link
+-------+ +-------+
IP-link = IP service, out of this document scopo
Eth-link = Ethernet connection
DCO-link = Pluggable connection (OTSi connection)
MC-link = Media Channel link (MC optical circuit)
Figure 3: Cross layer interconnection
The use cases supported by the models are:
Galimberti, et al. Expires 27 April 2023 [Page 7]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
Inter Layer Link discovery and provisioning
The inter-layer links are the interconnections (fiber) between the
pluggable ports (in the Packet Layer) and the ROADM ports (in the
Optical Layer). They are set in the Packet and DWDM nodes either
manually (e.g. CLI) or via PNCs. The values identifying the
inter layer links may be defined by MDSC which has the visibility
of both IP and Optical layers.
Network topology discovery and provisioning
MDSC retrieves the packet network topology from the P-PNC and the
optical network topology from the O-PNC. MDSC collects and
rebuilds the service topology based on the services information
coming from P-PNC and O-PNC as described in draft-ietf-teas-actn-
poi- applicability. [I-D.draft-ietf-teas-actn-poi-applicability]
End to End Packet service provisioning / deletion
MDSC is asked to set a Packet service between two Routers
requiring additional connectivity bandwidth.
Optical Circuit provisioning / deletion
MDSC is asked to set an Optical Circuit between two router ports
(O-PNC will receive the same request from MDSC). This is
specially needed during the network installation to provide
Connectivity between two Routers, the IP link will be set up later
using this optical circuit.
LAG extension
MDSC is asked to extend a service bandwidth. This may require
more Router optical connectivity.
Optical Restoration
O-PNC detects an optical network failure and reroutes the optical
circuits to a different path (and lambda).
Network Maintenance Operations
MDSC is asked to isolate part of the optical network for
maintenance and coordinate the O-PNC and P-PNC to preserve the
traffic during the maintenance operation.
3.1. Inter Layer Link discovery and provisioning
The inter-layer links are set in the Packet and DWDM nodes either
manually (e.g. via CLI or NMS) during the installation phase when the
operator connects the Pluggable Transceiver to the ROADM port via
fiber patch cord or is defined by the MDSC controller and provisioned
via the PNCs. One method and model to define the Inter Layer Link
is, for example, to assign a value to the patchcord (for Tx and RX
directions) and store those values in the Pluggable and ROADM port
Galimberti, et al. Expires 27 April 2023 [Page 8]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
provisioning when the fiber is connected between the two ports. This
allows the PNCs to retrieve the values and share them with the MDSC
for the correlation and check. Other smarter and automatic methods
of patchcord discovery may be defined but are outside of this draft
scope.
The inter-layer link must be set (or clear) any time a new pluggable
module is installed (or removed) and it is connected to the ROADM
port with the fiber patchcord. When a new DCO is installed an
inventory notification must be reported to the PNC and MDSC, the
reported info are:
- Pluggable port-ID (e.g. rack/shelf/slot/port or UUID)
- Supported Operational-modes
- Vendor OUI (if the operational mode in not standard)
- Pluggable part number (if the op-mode in not standard)
- Manufacturing data
It would be also possible to auto-discover the inter-layer (inter-
domain) links between DWDM coherent pluggables and ROADM ports by
checking the input/output power levels (and probably switching on/off
the lasers of the pluggables). This would require the help of MDSC,
O-PNC and P-PNC. The same methoc could be used to verify the
provisioned connectivty. For further study in this draft.
3.2. Network topology discovery and provisioning
The first operation executed by the P-PNC and O-PNC is to discover
the network topology and share it with the MDSC via the MPI. The
PNCs will discover and share also the inter-layer links (or
connections) so that the MDSC can rebuild the full network topology
associating the DWDM Router ports to the ROADM ports. Once the
association is discovered the P-PNC must share the characteristics of
Pluggable module with the MDSC and then MDSC with the O-PNC. At this
point the Hierarchical controller (MDSC) and the domain controllers
have all the information to commit and honour any service request
coming from the OSS/orchestrator. The details of the general
operations are described in draft-ietf-teas-actn-poi-applicability,
while this draft describes how to operate the Pluggable module during
the optical circuit set-up operation. As the Pluggable can be
inserted or remove at any time it is relevant to have admin and
operational state notification from the network to the PNC and MDSC.
Galimberti, et al. Expires 27 April 2023 [Page 9]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
3.3. End to End service provisioning / deletion
The End to End service provisioning is a multilayer provisioning
involving both the packet layer and the optical layer. The MDSC
plays a key role as it has the full network visibility and can co-
ordinate the different domain controllers' operations. The service
request can be driven by the operator using the MDSC UI or the MDSC
receives the service request from the operator OSS/Orchestrator.
The workflow for the creation of an end to end service is composed by
the following steps:
Galimberti, et al. Expires 27 April 2023 [Page 10]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
1. MDSC receives an end to end service request from OSS/Orchestrator
2. MDSC starts computing the different operations to implement the
service.
3. First MDSC starts to compute the routing, the bandwidth, the
constrains of the packet service.
4. If the Packer network can support the service without additional
connections among the Routers
4.1. then the packet service is commissioned through the P-PNC
4.2. a notification with all the service info is sent to OSS.
5. If more optical connectivity is needed
5.1. the MDSC notifies the operator about the extra bandwidth need
5.2. optionally, automatically identifies the spare router ports
to be used for the connection extension (e.g. A and Z).
5.3. The Router ports (pluggable) must be connected to A' and Z'
ROADM ports and must be compatible (in terms of optical
parameters, etc.).
6. MDSC (autonomously or under operator demand) asks to O-PNC to set
an optical circuit between ROADM ports A' and Z' providing
information on:
6.1. the pluggable supported parameters (A and Z)
- Pluggable Service source port-ID
- Pluggable Service destination port-ID
- Operational-mode (compatible)
- Vendor OUI (if the operational mode in not standard)
- Pluggable part number (if the op-mode in not standard)
- Admin-state (common ?)
6.2. the bandwidth (e.g. 100G or 400G, etc.)
6.3. the routing constraints (e.g. SRLG XRO, etc)
7. O-PNC calculates the optical route, selects the Lambda, verifies
the optical feasibility, calculates the pluggable TX power.
7.1. If all is OK, provisions the optical circuit in ROADM.
7.2. If anything went wrong the O-PNC rejects the MDSC request.
8. O-PNC updates the MDSC of successful circuit provisioning
including the path, the Lambda, the operational mode (or the
explicit optical parameters), the TX power, SRLG, etc.
The optical circuit at this point is provisioned but not yet
operational (no power coming from the transceiver yet)
9. The MDSC updates the service DB and forward the pluggable
provisioning parameters to P-PNC to complete the optical set-up.
10. MDSC is then ready to commission the packet service through P-PNC
10.1. has the visibility of end to end optical circuit (active)
10.2. the packer service is commissioned
10.3. MDSC service DB is updated
11. The MDSC notifies the OSS of successful end to end service set-up
Galimberti, et al. Expires 27 April 2023 [Page 11]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
NOTE: the Optical service may not be feasible due to optical
impairments calculation failure. In this case the O-PNC will reject
the optical circuit creation request to MDSC. It is up to the
operator (through MDSC) to scale down (e.g. propose a 300Gb/s
instead of a 400Gb/s service) the request or plan a network upgrade.
Another point to note is the information sent by MDSC to O-PNC about
the pluggable characteristics. In reality this info should be known
by the O-PNC at network commissioning time when the Inter Layer Link
is set or discovered. The pluggable information may have multiple
instances when the pluggable support multiple bit rate (e.g. ZR+).
In case of multiple bit rate (and multiple operational mode) the
O-PNC can decide to propose to MDSC a different bit rate (higher or
lower) calculated in base of the optical validation algorithms. That
is: MDSC ask for a 400Gb/s bit rate while O-PNC proposer a 300Gb/s
bit rate, instead of rejecting the circuit request.
3.4. Optical Circuit provisioning / deletion
Upon receiving an optical service request from the OSS/Orchestrator,
the MDSC starts performing the different operations to implement the
optical service (e.g. from A to Z). As an alternative the service
request can be driven by the operator using the MDSC UI.
The steps of the workflow are:
Galimberti, et al. Expires 27 April 2023 [Page 12]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
1. MDSC receives an end to end service request from the OSS/Orchestr.
2. MDSC starts computing the different operations to implement the
service.
3. to check whether the optical connectivity is feasible
3.1. automatically identifies the router ports to be
used for the optical connection (e.g. A and Z).
3.2. The Router ports (pluggable) must be connected to A' and Z'
ROADM ports and must be compatible (in terms of optical
parameters, etc.).
4. MDSC asks to O-PNC to set the optical circuit between ROADM
ports A' and Z' providing information on:
4.1. the pluggable supported parameters (A and Z)
- Pluggable Service source port-ID
- Pluggable Service destination port-ID
- Operational-mode (compatible)
- Vendor OUI (if the operational mode in not standard)
- Pluggable part number (if the op-mode in not standard)
- Admin-state (common ?)
4.2. the bandwidth (e.g. 100G or 400G, etc.)
4.3. the routing constraints (e.g. SRLG XRO, etc)
5. O-PNC calculates the optical route, selects the Lambda, verifies
the optical feasibility, the pluggable TX power.
5.1. If all is OK, provisions the optical circuit
6. O-PNC updates the MDSC of successful circuit provisioning
including the path, the Lambda, the operational mode (or the
explicit optical parameters), the TX power, etc.
7. The MDSC updates the service DB and forward the pluggable
provisioning parameters to P-PNC to complete the optical set-up.
8. MDSC verifies the end to end optical circuits (active)
9. The MDSC notifies the OSS of successful optical circuit set-up.
NOTE: the Optical service may not be feasible due to optical
impairments calculation failure. In this case the O-PNC will reject
the optical circuit creation request to MDSC. It is up to the
operator (through MDSC) to scale down the request or plan a network
upgrade.
Another point to note is the information sent by MDSC to O-PNC about
the pluggable characteristics. In reality that info should be known
by the O-PNC at network commissioning time when the Inter Layer Link
is set or discovered. The pluggable information may have multiple
instances when the pluggable support multiple bit rate (e.g. ZR+).
In case of multiple bit rate (and multiple operational mode) the
O-PNC can decide to propose to the MDSC a different bit rate (higher
or lower) calculated on the basis of the optical validation
algorithms. That is: MDSC ask for a 400Gb/s bit rate while O-PNC
proposer a 300Gb/s bit rate, instead of rejecting the circuit
request.
Galimberti, et al. Expires 27 April 2023 [Page 13]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
3.5. LAG extension
Upon receiving a LAG service request from OSS/Orchestrator, the MDSC
start computing the different operations to implement the request.
The MDSC would determine if an existing multi-layer connection exists
between the routers participating in the LAG. If so, the MDSC would
request the P-PNC to configure and add the new LAG bundle member link
using this existing connection, and notify the OSS confirmation of
the additional link. If more optical connectivity is needed, then
the procedures defined in section 3.3 would be followed.
3.6. Optical Restoration
For this use case the trigger for the Domain controller and MDSC to
take actions is coming from the optical data plane when the O-PNC
detects or is notified about an optical network failure (e.g. a fiber
cut or a node failure). This kind of events affect the traffic and a
number of optical circuits are lost.
1. First action is taken by the O-PNC to identify what are the
affected circuits enabled to restoration
2. For the circuits enabled to restoration O-PNC starts to compute
2.1. the restore paths
2.2. their feasibility and any optical parameter change (e.g.
lambda retuning, TX power, etc.)
3. If the restore path and all parameters are OK for the optical
feasibility
3.1. the restore path is provisioned
3.2. modifications to MDSC are sent to notify the new circuits data
- circuit path + SRLG
- Pluggable Service source port-ID
- Pluggable Service destination port-ID
- Operational-mode (compatible)
- Admin-state (common ?)
4. The MDSC updates the circuit DB and forward any pluggable
provisioning change to P-PNC
5. P-PNC will take care to apply the new provisioning data to the
pluggables (e.g. lambda, operational data, TX power, etc.)
6. The Restoration process is then completed and the IP connection
between the routers is recovered.
NOTE: the restoration may not be feasible due to optical impairments
calculation failure. In this case the O-PNC will notify the optical
circuit restoration failure to MDSC. It is up to the operator
(through MDSC) to take actions and/or plan a network upgrade.
Galimberti, et al. Expires 27 April 2023 [Page 14]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
In case the optical circuit restoration is revertible, is again O-PNC
responsibility to monitor the failure after the fix and start the
revert procedure to bring the restore path to the original route.
3.7. Network Maintenance Operations
The maintenance operation is requested by the OSS when a part of the
network needs a maintenance activity. There could be Packet network
maintenance or Optical network Maintenance. As an alternative the
maintenance request can be driven by the operator using the MDSC UI.
The Packet network maintenance is simple and is addressed by the MDSC
in cooperation with the P-PNC.
The optical network maintenance is more complex and needs the MDSC
coordination to ask the P-PNC to move away the traffic from the
resources under maintenance in the optical network. That means MDSC
has to search in the service DB whether a service is using a definite
optical link and re-route the service to a part of the optical
network not affected by the maintenance operation. Upon maintenance
completion the MDSC will bring all the traffic back to the original
route.
4. Optical Interface for external transponder in a WDM network
This document proposes an augmentation to the ietf-interface module
called ietf-ext-xponder-wdm-if. The ietf-ext-xponder-wdm-if [author
note: define the model] is an augment to the ietf-interface. It
allows the user to set the operating mode of transceivers as well as
other operational parameters. The module also provides threshold
settings and notifications to supervise measured parameters and
notify the client.
5. Structure of the Yang Module
ietf-ext-xponder-wdm-if is a top-level model for the support of this
feature.
6. Security Considerations
RSVP-TE message security is described in [RFC5920]. IPsec and HMAC-
MD5 authentication are common examples of existing mechanisms. This
document only defines new UNI objects that are carried in existing
UNI messages, thus it does not introduce new security considerations.
Galimberti, et al. Expires 27 April 2023 [Page 15]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
7. IANA Considerations
// [TEMPLATE TODO] In order to comply with IESG policy as set forth
// in http://www.ietf.org/ID-Checklist.html, every Internet-Draft
// that is submitted to the IESG for publication MUST contain an IANA
// Considerations section. The requirements for this section vary
// depending what actions are required of the IANA. See "Guidelines
// for Writing an IANA Considerations Section in RFCs" [RFC8126]. and
// see [RFC4181] section 3.5 for more information on writing an IANA
// clause for a MIB module internet draft.
This document registers a URI in the IETF XML registry [RFC3688].
Following the format in [RFC3688], the following registration is
requested to be made:
URI: urn:ietf:params:xml:ns:yang:ietf-interfaces:ietf-ext-xponder-
wdm-if
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
This document registers a YANG module in the YANG Module Names
registry [RFC6020].
This document registers a YANG module in the YANG Module Names
registry [RFC6020].
prefix: ietf-ext-xponder-wdm-if reference: RFC XXXX
8. Contributors
Galimberti, et al. Expires 27 April 2023 [Page 16]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
Phil Bedard
Cisco
phbedard@cisco.com
Rana El Desouky Kazamel
Cisco
reldesou@cisco.com
Gert Grammel
Juniper
ggrammel@juniper.net
Prasenjit Manna
Cisco
prmanna@cisco.com
Jose-Angel Perez
Vodafone
jose-angel.perez@vodafone.com
Manuel-Julian Lopez
Vodafone
manuel-julian.lopez@vodafone.com
9. References
9.1. Normative References
[RFC7698] Gonzalez de Dios, O., Ed., Casellas, R., Ed., Zhang, F.,
Fu, X., Ceccarelli, D., and I. Hussain, "Framework and
Requirements for GMPLS-Based Control of Flexi-Grid Dense
Wavelength Division Multiplexing (DWDM) Networks",
RFC 7698, DOI 10.17487/RFC7698, November 2015,
<https://www.rfc-editor.org/info/rfc7698>.
[RFC7699] Farrel, A., King, D., Li, Y., and F. Zhang, "Generalized
Labels for the Flexi-Grid in Lambda Switch Capable (LSC)
Label Switching Routers", RFC 7699, DOI 10.17487/RFC7699,
November 2015, <https://www.rfc-editor.org/info/rfc7699>.
[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>.
Galimberti, et al. Expires 27 April 2023 [Page 17]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
[RFC7792] Zhang, F., Zhang, X., Farrel, A., Gonzalez de Dios, O.,
and D. Ceccarelli, "RSVP-TE Signaling Extensions in
Support of Flexi-Grid Dense Wavelength Division
Multiplexing (DWDM) Networks", RFC 7792,
DOI 10.17487/RFC7792, March 2016,
<https://www.rfc-editor.org/info/rfc7792>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[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.G694.1]
International Telecommunications Union, ""Spectral grids
for WDM applications: DWDM frequency grid"",
ITU-T Recommendation G.698.2, February 2012.
[ITU.G872] International Telecommunications Union, "Architecture of
optical transport networks", ITU-T Recommendation G.872,
January 2017.
[OIF-400ZR-01-0]
Optical Internetworking Forum (OIF), "Implementation
Agreement 400ZR", OIF OIF-400ZR-01-0, March 2020.
[Open_ZR-Plus_MSA]
OpenZR+ Multi-Source Agreement, "400ZR+ Multi-Source
Agreement", OpenZR+ Open ZR+ MSA, September 2020.
[I-D.ietf-ccamp-dwdm-if-param-yang]
Galimberti, G., Kunze, R., Burk, A., Hiremagalur, D., and
G. Grammel, "A YANG model to manage the optical interface
parameters for an external transponder in a WDM network",
Work in Progress, Internet-Draft, draft-ietf-ccamp-dwdm-
if-param-yang-08, 24 October 2022,
<https://www.ietf.org/archive/id/draft-ietf-ccamp-dwdm-if-
param-yang-08.txt>.
[I-D.draft-ietf-teas-actn-poi-applicability]
"Applicability of Abstraction and Control of Traffic
Engineered Networks (ACTN) to Packet Optical Integration
(POI)", Work in Progress, Internet-Draft, draft-ietf-teas-
Galimberti, et al. Expires 27 April 2023 [Page 18]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
actn-poi-applicability-07, 10 July 2022,
<https://www.ietf.org/archive/id/draft-ietf-teas-actn-poi-
applicability-07.txt>.
9.2. Informative References
[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>.
[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>.
[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
Gabriele Galimberti (editor)
Cisco
Via S. Maria Molgora, 48 c
20871 - Vimercate
Italy
Phone: +390392091462
Email: ggalimbe@cisco.com
Jean-Francois Bouquier (editor)
Vodafone
Email: jeff.bouquier@vodafone.com
Ori Gerstel (editor)
Cisco
AMOT ATRIUM Tower 19th floor
TEL AVIV-YAFO, TA
Israel
Email: ogerstel@cisco.com
Galimberti, et al. Expires 27 April 2023 [Page 19]
Internet-Draft draft-mix-teas-actn-poi-extension-00 October 2022
Brent Foster (editor)
Cisco
Research Triangle Park
North Carolina,
United States
Email: brfoster@cisco.com
Daniele Ceccarelli (editor)
Ericsson
Email: daniele.ceccarelli@ericsson.com
Galimberti, et al. Expires 27 April 2023 [Page 20]