KPN's Vision On and Steps to Reach On a Fully Programmable Telco Network

Michel GeensenKPN

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Future vision on the network infrastructure architecture

A programmable network architecture

Lower costs

Higher capacity

Realtimefunctionality

Enhanced circularity

Increased continuity

Ambitions

Impactlesschanges

Technology

Bu

sin

ess

& O

pe

rati

on

s

SoftwareDefined

Open

DistributedDisaggregate

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The programmable network architecture vision

Fully automated

▪ Intent driven, model based, closed loop

Virtualised functions

▪ Network and application functions

Programmable infrastructure

▪ VNF offload

Software Defined

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The programmable network architecture vision

Content and services

▪ CDN, 3rd party

Network and application functions

▪ Flexible placement towards the edge

Topology

▪ Leaf-spine

Distributed

5

The programmable network architecture vision

Hardware and Software

▪ Decoupled lifecycles

Forwarding and Control

▪ Independent scaling and placement

Network hardware / software

▪ Modularity and flexibility

Disaggregated

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The programmable network architecture vision

Open interfaces

▪ All layers

▪ Standardised, public specifications

Open source

▪ Software and hardware

▪ Leverage communities

Open

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Building blocks for an open programmable network architecture

▪ CORD and NG-SDN are key building blocks for an open programmable network architecture

▪ CORD: datacenter concepts applied to central office, flexibility in service and function placement / creation

▪ NG-SDN: programmable network layer introduced => VNF off-loading and flexible data plane

▪ Not only applicable to CO(RD)

CORD / NG-SDN (Open Networking Foundation)

www.opennetworking.org/cord/

CORD NG-SDN

www.opennetworking.org/ng-sdn/

https://www.opennetworking.org/cord/https://www.opennetworking.org/ng-sdn/

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Building blocks for an open programmable network architecture

Stratum (Open Networking Foundation)

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Building blocks for an open programmable network architecture

P4 (Open Networking Foundation / P4.org)

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A Programmable Network Architecture

Overview

Residential

Business

Mobile

@

wholesale

Voice

TV

Internet

Mobile

BBU

DSLAM

FIBER

Open, automated, programmable network resource layer

End-to-end automation of network services and operation

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MC location

MC area

CORE

A programmable ‘Central Office’ architecture

▪ Programmable, disaggregate ‘CO’

▪ Combines CORD and NG-SDN

▪ Leaf – Spine topology (local and remote leaves)

▪ Spines are service agnostic

▪ Multi-homed access nodes (edge resilience)

▪ Separation of control and forwarding

▪ ONOS controller

▪ Programmable forwarding plane (VNF off-loading)

▪ STRATUM / P4

▪ Fixed – Mobile convergence

▪ Data plane: transport efficiency

▪ Control plane: reduction of functions

leaf leaf

leaf

services

compute

storage

spine spine

leaf leaf

leafleaf

Fixedaccess

Mobile access

Mobile access

Fixedaccess

Mobile access

redundancy

ONOS

BNG

VPN-C

PGW

L2XC-C SRV6

SRv6

STRATUM

SRv6

STRATUM

SRv6

SRV6

STRATUM

SRV6

STRATUM

SRV6

STRATUM

SRV6

STRATUM

STRATUMSTRATUM

SRV6 SRV6

SRV6

STRATUM

HAG

HAG-C

VPN L2XCBNG HAG

VPN L2XC

PGW

BNG HAG

VPN L2XC

PGW

BNG-C PGW-C

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Use cases under development

▪ Programmable traffic filtering & replication

▪ Network traffic received via optical splitters

▪ Specific filtering functions (L3 … L7 headers)

▪ Specific forwarding functions (tagging, replication)

▪ interested and authorized receivers

Intercept & Monitoring

Tofino

gRPC (P4 pipeline)REPLICATEFILTER

Intercept

Mon.1

Mon.2

Mon.3

simplecontroller

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Use cases under development

▪ IP VPN: baseline functionality for central office

▪ Multi-vendor / multi-chip setup: Barefoot Tofino + Broadcom

▪ Two approaches: custom pipeline + predefined pipeline

▪ Separate ONOS instances to avoid conflict

▪ Custom pipeline: custom app for pipeline control

▪ Predefine pipeline: modified version of segment routing app

▪ Separate app for configuration of NOS based border leaf

▪ NetConf

Programmable ‘central-office’: IP VPN

BF TOFINO

STRATUM

VPN KPN

MPLS

CORE

ONOScontroller

SR+app

BLapp

ONOScontroller

KPNVPN

BF TOFINO

STRATUM

BRCM

NOS

VPN

BRCM

OFDPA

VPN

BF TOFINO

STRATUM

VPN

leaf

leaf

leaf

spine

p4rt

gNMIgNMI

p4rt

netconf

openflow

p4rt MPLS

KPN

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Use cases under development

Programmable ‘central-office’: Hybrid Access

BF TOFINOBF TOFINO

STRATUM

GTP

µONOScontroller

HAGapp

P4

RT

P4

RT

F/M Session

mgmr

PPP

LB

‘P4

’ Sig

na

llng

RADIUS

InternetRG

▪ Hybrid: fixed and mobile access

▪ Programmable forwarding plane

▪ Barefoot Tofino (initial development on Tofino model)

▪ STRATUM: P4RT to control pipeline

▪ ONOS based control plane

▪ HAG app to program forwarding state

▪ Separate session manager application to avoid session signalling impact on ONOS

▪ CUPS – like architecture

▪ In band ‘P4’ signalling channel (to be used for both fixed and mobile)

▪ State control interface (using P4RT interface of STRATUM)

▪ In development on Tofino model, porting to HW planned

▪ SW model key in development

STRATUM

P4

RT

P4

RT

LB Sessionmgmr

‘P4

’ Sig

na

llng

gN

MI

gN

OI

gN

MI

gN

OI

Development and Testing in Virtual

Environment

Acceptation Tests and Production in Hardware

Environment

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KPN Fabric Simulation for Fabric & Function development

Based on similar ONF developments within for example µONOS, Atomix etc

FabricFrameworkController

FabricFrameworkController API

FabricFrameworkController Service

resources

Fabric ServiceFabric Service

FabricSet

1

1

1

2

2

2

3

3

3

deploy

Fabric Service

Controller

FabricSwitchSet ServiceFabricSwitchSet Service

FabricSwitchSet

deploy

1

1

1

2

2

2

3

3

3

FabricSwitchSet Service

Controller

µONOSSet ServiceµONOSSet Service

µONOSSet

deploy

1

1

1

2

2

2

3

3

3

µONOSSet Service

Controller

µONOSSet ServiceµONOSSet Service

ControlAppSet

deploy

1

1

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2

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3

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Control Application Service

Controller

Kubernetes Controller(s)

Test execution Client

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The programmable network architecture

The programmable network architecture is software defined, distributed, disaggregate and open in nature.

Open interfaces and open (source) specifications are key building blocks

▪ ONF CORD, ONOS, NG-SDN, STRATUM

▪ OCP

Development started on different of use cases

▪ Research / PoC stage, baseline for next steps

Further development through community effort

Thank You