network operations in the era of nfv & sdn · pdf filenetwork operations in the era of nfv...

Network Operations in the Era of NFV & SDNChris Bilton - Director of Research & Technology, BT

© British Telecommunications plc

Agenda

NfV will Change Operations Managing hybrid networks end to end Impact of NfV on the organization & architecture


33

The 3rd Way The new network operations world


44

Introduction Overview of NfV & SDN


11

The Challenge Today’s Carrier operations Contrasting Carrier and IT operations


22


Overview of NfV and SDN

The operationalchallenges ofNfV and SDN

areDifferent!


Agenda



11



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33



44


Challenges of Today’s Carrier Operations

Does NfV present an opportunity to address these challenges?Does NfV present an opportunity to address these challenges?

Costly manualdeployment &upgradeprocesses

Many SpecificH/Wmanagementand planningprocesses

Operations iseither process &script driven &Highly automatedfor volumeservices orHighly skilled &specialised forcomplex services

Networkoperations avoidthe risk ofcentralisationbutdata centreoperations avoidthe costs ofdistribution

Many monolithicoperational silos

Difficult tomanage &coordinate,resulting inchallengesdelivering end-to-end service

Operationalteams focus ison customerservice

impacts theirability to engageearly on newtechnologies

All of these impact the overall Customer ExperienceAll of these impact the overall Customer Experience


Contrasting Carrier and IT Operations

• The patient must remain alive during the operation• Scope of operation is precise and focussed• Time is limited.• Only attempted if really needed.

HIP REPLACEMENT SURGERYPrinciple similar to a typical Network upgrade

CHANGING ENGINE OILPrinciple similar to a typical IT upgrade

• The car and engine are stopped and idle during the operation.• Context of operation can be broad (full service to engine

replacement)• Taking longer has little or no consequence for the car & engine• Carried out as a matter of routine.

Operating mission critical IT Apps or a network built on IT in the Cloud requires mergingthe best of todays Carrier & IT operations to provide carrier-grade

performance, availability and outstanding Customer Experience

Operating mission critical IT Apps or a network built on IT in the Cloud requires mergingthe best of todays Carrier & IT operations to provide carrier-grade

performance, availability and outstanding Customer Experience


Agenda



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44

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11


Carriers typically manage hybrid networks E2E

Global carriers today have to manageheterogeneous networks e.g. Owned & Sharedelements of:

• Access (xDSL, Fibre, WiFI, LTE, etc.)• Core (Optical, IP/MPLS3rd Party, etc.)• Services (Ethernet, VPNs, Mobile EPC, IMS,

VoIP, CDNs, etc.)• Data Centre & Cloud Compute

Operational processes must be designed tosupport interoperability, E2E Services and

meet customer SLAs underpinned by Standards

How does NfV fit into this operational framework ?How does NfV fit into this operational framework ?


NfV as a Catalyst to Change Network Operations

FlexibilityFlexibility

AutomationAutomation

Simpler planningSimpler planning

Uniform operationsUniform operations

Cost savingsCost savings

Convergence of IT &Network mind-setsConvergence of IT &Network mind-sets

Learning from bothLearning from both

Evolutionary orRevolutionary?Evolutionary orRevolutionary?

OrganisationOrganisation

THE NfV PROMISE… THE REQUIRED CHANGES ARE…

Modular Technical &Operational ArchitecturesModular Technical &Operational Architectures

Customer ExperienceCustomer Experience


Operational frameworks for NfV

Servers

Specialisation for carrier scale Multi-skill for managed enterprises

VNFs

Servers

Although the operational frameworks are different the technology architectureshould be consistent to minimise development & operational costs

Although the operational frameworks are different the technology architectureshould be consistent to minimise development & operational costs

to

VNFs

HypervisorsHypervisors


ETSI NfV ISG High level System Architecture

EMS 1EMS 1 EMS 2EMS 2 EMS 3EMS 3

VNF 1VNF 1 VNF 2VNF 2 VNF 3VNF 3

OSS/BSSOSS/BSS

Service, VNF and Infrastructure DescriptionService, VNF and Infrastructure Description

Virtualisation LayerVirtualisation Layer

Virtual ComputingVirtual Computing Virtual ComputingVirtual Computing Virtual ComputingVirtual Computing

Computing H/WComputing H/W Storage H/WStorage H/W Network H/WNetwork H/WHardware resources

NfV 1

VL-Ha

Vn-Nf

OrchestratorOrchestrator

VNF Manager(s)VNF Manager(s)

VirtualisedInfrastructureManager(s)


Or-Vnfm

Vi-Vnfm

Os-Ma

Se-Ma

Ve-Vnfm

Nf-Vi

NfV Management and Orchestration

Execution ref points

Main NfV ref points

Other ref points

Or-Vi

EMS 1EMS 1 EMS 2EMS 2 EMS 3EMS 3

OSS/BSSOSS/BSS

OrchestratorOrchestrator

VNF Manager(s)VNF Manager(s)




Modularity and What Goes Where

EM VNFM VIM NFVO OSS/BSS

NS

VNF

VM VN

Typeregistration

Typetemplate

repository

Resourcecoordination

ResourceReservation &

usage database

Inventorydatabase

Alarmmonitoring

Fault correlation,localisation,

and route cause

Instanceremoval

coordination

Instancereconfiguration

coordination

Typetemplatecreation

E-E Service

ExistingComponents

? ?VNFvendor

Existing

Instancecreation

coordination


Linking of Processes – Especially Inventory Database

Instancecreation

coordination

Instanceremoval

coordination

Instancereconfiguration

coordination

Inventorydatabase

Fault correlation,localisation,

and root causeupdates interrogates

EM VNFM VIM NFVO OSS/BSS

? ?VNFvendor

Existing

Logical


Conclusions for Technical & Operational Architectures

• Modular and well-defined architectures, interfaces & processesare required

• More than one Operational model may exist but they should usethe same architecture

• There is no single orchestration entity– Need end-to-end and domain orchestration– Need peer or sideways interfaces, including to legacy OSS– Enables evolutionary migration of legacy network to NfV

Hence, the Network must be viewed as the source ofauthoritative information about the network

Hence, the Network must be viewed as the source ofauthoritative information about the network


Agenda

NfV will Change Network Operations Managing hybrid networks end to end Impact of NfV on the organization & architecture

NfV will Change Network Operations Managing hybrid networks end to end Impact of NfV on the organization & architecture

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22

11

44


ServersNetworkEquipment

Operationally, Network Equipment and Servers Are Different• TACACS/RADIUS authentication• Serial console port• Rich network features: timing & sync, dying

gasp, OAM, TDM interfaces• In-box fault resiliency• Single vendor contact & support point• Well bounded behaviours

• Active Directory• Intelligent Platform Management Interface• Simple Ethernet• Move to a new box fault resiliency• Multiple vendor contacts & support points• Less well bounded behaviours

VM VM VM VM

VM VM VM


NfV - A Catalyst for The New Operations WorldHardware spares, upgrades andmaintenance:Leverage standard Data Centre processesand infrastructure management

VNF Technology Refresh:Software upgrade rather thanoperationally-intensive hardware-basedrefresh

Hardware spares, upgrades andmaintenance:Leverage standard Data Centre processesand infrastructure management

VNF Technology Refresh:Software upgrade rather thanoperationally-intensive hardware-basedrefresh

Standards - E2E service management ofNfV will require inter-working/inter-operating between peer ops teams andOSS/Orchestration systems.

Parallelism and load balancing used toprotect network functions & critical ITfunctions, rather than moving VMs & theirstate

Standards - E2E service management ofNfV will require inter-working/inter-operating between peer ops teams andOSS/Orchestration systems.

Parallelism and load balancing used toprotect network functions & critical ITfunctions, rather than moving VMs & theirstate

VM VM VM VM

VM VM VMFW

Router

SBC

IPS/IDS

Gateway

EPC

DPI

CDN

IMS

Maximize operationalbenefits by bringing togetherthe best of IT and Networks

The 3rd Way

Maximize operationalbenefits by bringing togetherthe best of IT and Networks

The 3rd Way


Converged hardware

Telecoms Router

IT Server

Convergence in Hardware – the “Rouver”

PCIe bus

• Line cards• Switch fabric• Control cards

PCIe bus

Packet processor CPU


Supply Side Mash-Up

New developmentand supplyprocesses

System maintenance


Changes in Service Operations

NfV allows us to rapidly create, deploy and operate a serviceor service chain from a catalogue of functions

NfV allows us to rapidly create, deploy and operate a serviceor service chain from a catalogue of functions

Culture Processes

TrainingEfficiency

Skills Agility


Open source,Big Data….

Ongoing innovation will present further Operational Challenges

Open, competitive supply ofinnovative applications

• Separation of network control fromforwarding

• Network abstraction enables fasterinnovation

• Network service speed & agility• Improves Customer ExperienceOpen Innovation

Network operations

Service operations• Network Functionsvirtualised on standard server H/W

• Modular architecture• Service creation speed & agility• Reduces CAPEX, OPEX, Space & Energy Consumption• Improves Customer Experience

OSS / BSS

SoftwareDefined

Networks

NetworkFunctions

Virtualisation

BusinessIntelligence,ProcessMining….

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