photonic sdn models for disaggregated optical networks ... · photonic sdn models for disaggregated...

Photonic SDN Models for Disaggregated Optical Networks –Insights and Results from the SENDATE Multivendor Field TrialAchim Autenrieth, Anders Lindgren, Jonas Mårtensson, Martin Skorupski, Hanif Kukkalli, Mohit Chamania,

Filipe Caetano, Dmitry Khomchenko, Stefan Melin, Roope Tanner, Anders Gavler, Herbert Eiselt, Jörg-Peter

Elbers, Antonio Felix, Thomas Luipold, Rainer H. Derksen, Ulrich Häbel, Stefanos Dris, André Richter

ONDM2019, Athens, Greece, 14 May 2019

ONDM 2019

Athens, Greece

funded by

© 2019 ADVA Optical Networking. All rights reserved. Confidential.22

Outline

Trends in optical networking

SENDATE multi-vendor field trial & interop events

Results and Outlook

1

2

3

4

SDN models for disaggregated photonic networks


Network architecture

• Open optical networking

• Disaggregation

“Hard facts”

• Compact, high-density HW

• 400G+ per wavelength

• High-order modulation

• Flexible grid spectrum

“Soft facts”

• Programmability on

network, device and

port level

• Network automation

during set up and

operation

From “fix and forget” to programmable flexibility and scalability

Major trends in optical networkingTe

rmin

al

API API

OLS

Term

inal

API


Separation of terminal and OLS is most common

Disaggregation models and benefits

Openness drives disaggregation

Full disaggregation

All devices as separate managed elementsTerm

inal

API

RO

AD

M

API

Am

plifi

er

API

Term

inal

API

Term

inal

API API

OLS

Term

inal

API

Partial disaggregation

Terminal and Open Line System (OLS) as separate elements

Value

Optical line system

Fiber

3 years+ 10 years+

Transponder

Depreciation

Benefits

• Enables flexibility to deploy best-in-class equipment

• Facilitates multi-vendor environments

• Avoids implementation lock-ins

• Triggers innovation and evolution

• Accommodates different lifecycles

Different lifecycles of optical components


Software defined interfaces

Flexibility is key for disaggregated networks – and cost efficiency

Advances in technology: Ultra-flexible terminals

100G…600G

Channel rate –

flexible wavelengths

Modulation – with

interleaving (hybrid)

Symbol rate

– tunable Baud rate

Shaping –

channel adaption

Superchannel capacity

– multiple lambdas

FEC – ultimate gain

and options

400-1200G

35…70 GBd


Monitoring & Alarms Provisioning & SDN Installation & Commissioning

Variety of legacy and SDN APIs

Programmability and automation via open APIs

User management

TACACS+/RADIUSIP/serial

DCN

ZTP or push (comms,

SW, config, activate)

Local configuration

(DHCP, playbooks,..)

Optical SDN domain controller

& network management

CLI

REST

NETconf

WebGUI

REST

NETconf

Netconf

REST (WebSocket)

SNMPv2c

gRPC

SNMPv2c

CLI

WebSocket/REST

Netconf

WebGUI

gRPC

Alarm APP

or user

User

NB API


Configuration & monitoring in disaggregated networks

SNR & OSNR

loss and amplification

High flexibility and OLS complexity requires abstraction and open APIs

EVM* vs SNR

nonlinearity and filters

TX / RX power

connection

FEC BER & Q factor

general eventsODUk

subnets

LLDP

peer device

PDL & PMD

polarization effects

CD

link lengthSOP

e.g. lightning strikes

Frequency offset

equipmentClient counters (RMON)

client vs network

Terminal Terminal

OLS

*Error Vector Magnitude

Disaggregated

Transponder

OTSi - Optical

tributary signals

Channel rate

Frequency

Spectral width

Modulation

Symbol rate

Roll-off

FEC

Transmit power

…

Service connectivity

Client → Network

Network connectivity

WSS, EDFA, …


The challenge ahead …

Standardize control of Transponders− Configuration of multiple layers like Photonic Media, OTN, and Ethernet

− Effectively describe and configure relationship between Client and Network ports

− Monitoring capabilities for ensuring valid operation

Path computation and provisioning in (multiple) Open Line Systems− Evaluate optical performance of paths in optical networks

− Establish optical paths in the network using an SDN controller

− Potentially extend this to a multi-vendor multi-domain configuration

Ensure interoperability through proof of concept and interop events− SENDATE field trial

− ONF Wireless Transport PoC 5.0

− ONF Open Disaggregated Transport Network Project


Overview SDN standard bodies and data models

ONF Transport-API

DevicesONF Core Model

Industry Alliances

Infrastructure

Network

Services

Co

mm

on

Optical

Transport

Telemetry

Standards Defining Organizations (SDOs)

Device

Network

Services

To

po

log

y

Path

Co

mp

uta

tio

n

Vir

tual

Netw

ork

No

tifica

tio

n

Co

nn

ect

ivit

y

Lead: Lead:

IETF Network

IETF Network-

Topology

IETF TE Topology

IETF WSON

Technology

IETF Flexi-Grid TED

IETF Flexi-Grid

media channel

IETF TE Tunnels


ONF Core ModelONF TR-512 Core Information Model v1.4

Core Model simplified

Scope of Control

Forwarding

element

Adjacency

between FDs

Termination

and adaptation

Potential for

forwarding

Network Control

Domain

Forwarding

Domain

Link

Logical

Termination Point

Forwarding

Construct

Model of data plane resources in an SDN-enabled network

• Technology agnostic

• Recursive (Forwarding Domain may contain FDs)

• Models static and dynamic elements

• Extensible to different technologies and environments

TR-512.A.4 applies the Core Model for photonic networks

(Photonic Media Model).

This work has been used extensively by MEF and Facebook TIP

Open Transport Configuration & Control

Lyndon Ong (Ciena), 12 Dec 2017

LogicalTerminationPoint

LayerProtocol FcPort

LinkPort

FdPort ForwardingDomain

Link

ForwardingConstruct


ONF Core Model

• Can be applied to a wide range of application scenarios.

Demonstrated applications include

− Ethernet switching configuration

− OTN switching/multiplexing configurations

− Precision Timing Protocol propagation

− Photonic media configuration and monitoring

• Conditional package definitions improve extensibility

− Network element definition remains unchanged and does not require frequent updates

− Conditional packages can be introduced and updated incrementally


Designed for extensible network element presentation

ONF Core Information Model

Port Presentation with

logical termination points

Interconnections presented

using forwarding constructs

Conditional Packages

- ……..

- ……..


- ……..

- ……..


- ……..

- ……..

Layer specific information

presented using

conditional packages

© 2019 ADVA Optical Networking. All rights reserved. Confidential.131313 © 2019 ADVA Optical Networking. All rights reserved. Confidential.13

Conditional Package developed using ONF T-API constructs

ONF Photonic Media Model for Open Terminal APIs

- Supported Channels / Grids

- Supported Modulation Formats

- Supported Applications

- Optical Power Threshold limits

- Configured Channel/Grid

- Modulation configured

- Laser Control

- Receive Power Threshold

Configuration

- Transmit Power configuration

- Current Channel/Grid

- Current Modulation

- Received/Transmitted Power

- Current Laser Status and PMs

- Bias Current

- Temperature

- Alarm list with severity and

description

- Optical Transport Performance

data

- Pre-FEC BER

- Post-FEC BER

- Corrected/Uncorrected

bits/bytes

- List of historical Optical Transport

Performance data

- Pre-Post FEC BER

- Corrected/Uncorrected

bits/bytes

Interface Capability Interface Configuration Interface Status

Current Problems Current Performance Historical Performance


Industry Progress on Info Models & API Alignment

CIM

TAPI 2.0, 2.1, …

TAPI 2.0

Interop

Demo

OpenOLS,

OpenDevice

Alignment

Transponder

Control

~Alignment

ODTN1.0, 1.5, 2.0…


Terminal

Disaggregated single-domain SDN control

OLS domain B

SDN Domain

Controller

SDN Orchestrator

Op

en

Co

nfi

g

T-API

Terminal

Op

en

Co

nfi

g

Single Vendor Open Line System

• Capability to add/drop and route channels

• Control of individual equipment via vendor

domain controllers using custom protocols

Integration with SDN Orchestrators

• Interact with domain controllers using

standard protocols

• ONF T-API with extensions to report

optical path characteristics used to

request and configure lightpaths


Terminal

Disaggregated multi-domain SDN control

OLS domain B

SDN Domain

Controller

SDN Domain

Controller

SDN Orchestrator

OLS domain A

Spectrum gateway

Op

en

Co

nfi

g

T-APIT-API

Terminal

Op

en

Co

nfi

g

Challenges

− End-to-end path calculation by orchestrating domain specific path computation

− Optical reach validation using optical impairment parameters exposed by domains.

− Orchestrating provisioning across multiple domain controllers


SENDATE Multi-vendor Field Trial (Sep. 2018)Open, Disaggregated Network Control

• 2 vendor domains

• Coherent 100G interfaces

• Transparent optical

interconnect

• ONF Transport API 2.0

with optical extensions

(photonic media model)


Field (43.5 km)

Field (43.5 km)

Att

. (10

dB

)

Fiel

d (4

3.5

km)

Domain SDN Controller


C1

C3

C2

A3

A2

A1

λ

λ

TP.C1

TP.A1

ODL Multi-Domain Controller

Planning App

Provider Client App

TAPI

TAPITAPI

λ

λ TP.A2

TP.C2

ROADM

Legend

Transponderλ

Fiber Span

Lightpath

Control Channel

Service Management

Network Orchestration

Control andManagement

Infrastructure

Infrastructure

λ

λ

Control and Management

NetworkOrchestration

ServiceManagement

CustomerManagement

RESTCONF CLIENT



λ

λ

λ

λ

λ

λ

ROADM

λ

Transponder

Fiber Span

Wavelength

Legend

Planning App

TAPITAPI

TAPI

Transport Orchestrator ODL

λ λ

λ λ

TP.C3TP.A3

TP.A4TP.C4

SENDATE trial - Multi-domain provisioning

Lightpath provisioning workflow

1. Planning app receives topologies and wavelength occupancy from domain controllers + inter-domain links from a database.

2. It receives request for a new connection from user of the northbound rest client.

3. It then computes a number of possible paths and assigns available wavelengths.

4. Computed paths are split into one segment per domain and planning app requests OSNR for all segments using a TAPI extension.

5. Planning app calculates end-to-end OSNR.

6. It reports all feasible paths along with OSNR to the northbound rest client.

7. User selects one of the paths which is activated by the planning app via domain controllers using TAPI including extension for wavelength configuration.


Infrastructure

λ

λ

ROADM

λ

Transponder

Fiber Span

Wavelength

Legend

Coriant R1

Coriant R2

Coriant R3

Adva R1

Adva R2

Adva R3

Infrastructure

λ

ROADM

λ

Transponder

Fiber Span

Wavelength

Legend

Coriant R1

Coriant R2

Coriant R3

Adva R1

Adva R2

Adva R3

λ

SENDATE trial - Test case examples

1. Single-domain disaggregated

path provisioning

2. Multi-domain disaggregated

path provisioning

… with various combinations of

transponder and OLS domains

Test Case 1

Test Case 2


SENDATE trial - Graphical user interfaceOpenDaylight multi-domain optical planning & provisioning GUI


Summary - Results of the trial

Successful proof of concept that routing and reach planning of optical circuits can

be managed by a multi-domain controller and generic planning tool for

simplified network operation across disaggregated, multi-domain optical network

Open Challenges (not covered in the trial)

• Routing: Explicit routing

• Flexible modulation format assignment

• Custom wavelength assignment

• Detailed reach validation

Highlights

• Generic multidomain reach planning.

• Necessity for introduction of

Open Optical Line Systems.

• Transparent interdomain links on the

ROADM line side

• Interdomain connections – Transponder

circuits passing both vendor domains.


ONF PoC 5 (Nov. 2018, Telefonica, Munich)SDN controlled open disaggregated optical transport

• ONF T-API based SDN control

• NETCONF protocol and YANG

information model

• ADVA open terminals and open line

system

• Open terminals for 1 and 10G services

• Open line system (OLS) as infrastructure

Optical Transp.

Network Domain Controller

Microwave

Extant ToolExtant Tool

Extant Tool

Ap

plica

tio

n

Ap

plica

tio

n

Ap

plica

tio

n

Ap

plica

tio

n

ADVA OLS


Open Disaggregated Transport Network (ODTN)OFC 2019, Mar. 2019 and ongoing …

1. Intent-based serviceprovisioning

2. Service requesttranslated into OLS intent and TX configuration

3. Provisioning thoughONF T-API on OLS via Ensemble Controller and OpenConfig on TX


Conclusion

Partially disaggregated Open Line Systems provide an ideal trade-off for application

in operator networks

• Ease of management of optical line systems

• Easy integration of third-party transponders

ONF Core Model provides a path towards incremental standardization

• Based on best-practice management information models (ITU-T, TMF, …)

• Separation of capabilities in conditional packages ideal for differentiating applications,

e.g. Photonic Media model as conditional package

ONF Transport-API for OLS and OpenConfig for Transponder is most supported

Interoperability requires further alignment of standards and open source initiatives

Thank you

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photonic sdn models for disaggregated optical networks ... · photonic sdn models for disaggregated...

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