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SDN for Network Operators
Víctor López
Core Network Evolution
Global CTO Unit
Index
01

02

03

04

Core Network Evolution
Telefónica I+D, Global CTO

Cloud-Ready Transport Networks

The SDN Concept

SDN for Network Operators

Concluding Remarks

2
01

Cloud-Ready Transport
Networks
Cloud-ready Transport Network Approach

Cloud services

Multilayer Coordination

Network

Routing, monitoring and automated
Photonic network configuration

Photonic control plane
GMPLS + PCE
Flexible

Transport

Optical
Network
Network

Cross-Stratum

Horizontal and Vertical Orchestration
IP/MPLS

Cross-Stratum Optimization
Optimization

Routing, monitoring and
automated IP configuration

Signalling

L. M. Contreras, et all: “Towards Cloud-Ready Transport
Networks”, in IEEE Communications Magazine,
September 2012, Vol. 50, Issue. 9, pp. 48 - 55.
Core Network Evolution
Telefónica I+D, Global CTO

4
Cloud-ready Network Approach
§  The

target is an E2E network able to perform automated
connectivity control between end users and cloud data centers

Cloud Ready Networks rely on two
main technological pillars

§  This innovative network model aims to:
ü  Accelerate service provisioning and performance monitoring
ü  Enable on-demand connectivity configurations (e.g
bandwidth) by end users

Network Control

Flexible Transport
Network

ü  Optimize both cloud costs and power consumption
ü  Guarantee the required QoS/QoE (…) for real time and
video services

Cloud Services

Leverage of

API

NetworkControl

Network-Cloud interface:
new services development

Elasticity
& QoS

Resource Mngmt
E2E MPLS
photonic network

Flexible
transport
network

IP control and resource allocation (e.g
IP v6)
IP Forwarding

CPE

Mobile and Fixed Access
Networks

E2E MPLS
OPTICAL TRANSPORT

Core Network Evolution
Telefónica I+D, Global CTO

5

Capacity
Traditional core/backbone network operation is
very complex and expensive

• 

Core network operation is not adapted to flexible networking
§  Multiple manual configuration actions are needed in core network nodes
§  Network solutions from different vendors typically use particularized Network
Management System (NMS) implementations
§  Very long service provisioning times

CURRENT APPROACH FOR NETWORK
PROVISIONING
Service
Management
Systems

Internet

Voice

CDN

Cloud

Business

Collection of Umbrella Systems (see next)

Network
Provisioning
Systems
Core
Network
Nodes

Core Network Evolution
Telefónica I+D, Global CTO

Metro
NMS

IP Core
NMS

Complex and long workflows for
network provisioning over different
segments (metro, IP core, Optical
transport) requiring multiple
configurations over different NMS

Optical Transport
NMSs

NMS
NMS
NMS
NMS
NMS
NMS
NMS
NMS
Vendor A Vendor B Vendor C Vendor D Vendor E Vendor A Vendor B Vendor C
IP
IP
Metro
IP
Optical
Optical
Optical
Metro
Node
Node
Node
Node
Node
Node
Node
Node
Vendor A Vendor B Vendor C Vendor D Vendor E Vendor A Vendor B Vendor C

6
Now… Really complex

•  Example: Telefonica Spain has 269 management systems and 795
interactions
•  Plenty of Proprietary interfaces

Core Network Evolution
Telefónica I+D, Global CTO

7
Cloud Computing – Hype Cycle

Souce: Gartner (2012)
Core Network Evolution
Telefónica I+D, Global CTO

8
Inter-data center traffic

•  Standard cloud migration process in companies:
1.  Virtualization
VM VM VM VM VM
Hipervisor

2.  Private cloud
Autoprovisioning
Service

Service

VM VM VM VM VM

3.  Hybrid cloud

Hipervisor

Autoprovisioning

Autoprovisioning
Service

Service

Service

VM VM VM VM VM

VM VM VM VM VM
Hipervisor

Core Network Evolution
Telefónica I+D, Global CTO

Secure VPN

9

Service

Hipervisor
Hybrid Cloud Computing - Elasticity

•  Traditional IT and network dimensioning yields to this situations:

Over-provisioning

Capacity
Resources

Resources

Under-provisioning

Capacity

•  The network and the cloud must adapt to the end users requirements.
t

Resources

t

Capacity
t

Core Network Evolution
Telefónica I+D, Global CTO

10
Cloud Computing imposes new needs to fit by
network providers

•  Services hosted in datacenters
spread at the network border
•  Extremely high temporal bandwidth
• 
• 

variability is shown in cloud traffic
demand
Strong need for high-capacity and
ultra-long haul datacenter
interconnection
Service experience in cloud must
be equivalent to the one perceived
locally

Source: “Towards predictable DC networks”, SIGCOMM, 2011

1Gbps

100Mbps

Source: Amazon EC2 performance (http://bit.ly/48Wui)

Impact on two main network axis: Capacity and Elasticity
Core Network Evolution
Telefónica I+D, Global CTO

11
The Vision
User-centric connectivity experience

To adapt our
offer to users
necessities
A network that delivers the best connectivity
experience in an efficient and flexible way
Insight capabilities

Mouldable infrastructures

To understand
changes
inside-out and
be able to decide
in real time

To cope with
quick changes
and uncertainty

Core Network Evolution
Telefónica I+D, Global CTO

12
02

The SDN Concept
Software Defined Networking

SDN
Open interfaces (OpenFlow) for
instructing the boxes what to do

Network equipment as
Black boxes
FEATURE

FEATURE

OPERATING SYSTEM
FEATURE

SPECIALIZED PACKET
FORWARDING HARDWARE

FEATURE

FEATURE

FEATURE

OPERATING SYSTEM

OPERATING SYSTEM

SPECIALIZED PACKET
FORWARDING HARDWARE

SPECIALIZED PACKET
FORWARDING HARDWARE

FEATURE

FEATURE

OPERATING SYSTEM
SPECIALIZED PACKET
FORWARDING HARDWARE

SDN

Boxes with autonomous
behaviour

FEATUR
E

FEATUR
E

OPERATING SYSTEM
FEATUR
E

FEATUR
E

SPECIALIZED PACKET
FORWARDING HARDWARE

OPERATING SYSTEM
SPECIALIZED PACKET
FORWARDING HARDWARE

FEATUR
E

FEATUR
E

OPERATING SYSTEM
FEATUR
E

FEATUR
E

Decisions are taken out of the box

SDN

SPECIALIZED PACKET
FORWARDING HARDWARE

OPERATING SYSTEM
SPECIALIZED PACKET
FORWARDING HARDWARE

Simpler OSS to manage the
SDN controller

Adapting OSS to manage black boxes
Core Network Evolution
Telefónica I+D, Global CTO

14
The Ossified Network

•  Many complex functions
• 

baked into the
infrastructure
OSPF, BGP, multicast,
differentiated services

§  Traffic Engineering,
NAT, firewalls, MPLS,
redundant layers, …

•  An industry with a

“mainframe-mentality”,
reluctant to change

Core Network Evolution
Telefónica I+D, Global CTO

15

15	
  
Extracting Simplicity vs Mastering Complexity

Core Network Evolution
Telefónica I+D, Global CTO

16
Out of the Boxes

•  The network does not need to be
• 
• 

FEATURE

OPERATING SYSTEM

seen any longer as a composition
of individual elements
User applications interact with the
network controller(s)
The network becomes a single
entity

FEATURE

FEATURE

SPECIALIZED PACKET
FORWARDING HARDWARE

OPERATING SYSTEM
SPECIALIZED PACKET
FORWARDING HARDWARE

FEATURE

FEATURE

SPECIALIZED PACKET
FORWARDING HARDWARE

•  We can apply different levels of
abstraction

§  Think of a network design flow
§  And even an IDE

17

FEATURE

FEATURE

OPERATING SYSTEM

OPERATING SYSTEM

§  Suitable to be programmed
§  Aligned with current IT practices

Core Network Evolution
Telefónica I+D, Global CTO

FEATURE

SPECIALIZED PACKET
FORWARDING HARDWARE
SDN Principles

§  Even bypassing conventional layered
protocols and their configuration

Core Network Evolution
Telefónica I+D, Global CTO

18

."

• 
• 
• 

App"

SDN Control Plane Software!

•  Functions are split between per-packet

rules on the switch and high-level
decisions at the controller
Open interface between control and data
plane
Open interface to the control plane
Controllers actually program the network

App"

§  Simple packet processing elements
(switches)
§  Software-based controlling components
(controllers)

App"

App"

•  Make network behaviour programmable
§  Beyond individual boxes
•  Fully decouple data and control planes

Switch "
Switch"
Switch"
Switch"

Switch"
The SDN Ocean

Are w

Core Network Evolution
Telefónica I+D, Global CTO

19

e crea
tin
of pro g a new se
tocols
t
?
Basic SDN Approach for OpenFlow Domains
Application Layer
API

ALTO
TED

SDN orchestrator

OAM Handler

	
  
	
  
	
  
	
  

SDN
Controller

SDN CONTROLLER
VNTM PCE
Provisioning Manager

OPENFLOW

	
  
Infrastructure	
  	
  
Layer	
  (e.g	
  
DataCenter)	
  

	
  

Core Network Evolution
Telefónica I+D, Global CTO

OpenFlow is based on the concept of actions that are applied to each packet of a given flow
(Ethernet-level addresses, VLAN tags, IP addresses, MPLS labels or transport-level ports).
The actions taken by SDN the controller comprise: inserting and removing tags (layer 2), performing
routing (layer 3) and also providing differentiated treatment to packets (QoS)

• 
• 

We can not have a centralized entity to configure all network devices.
We need controllers which can talk each other. Is this another control plane?
20
03

SDN for Network
Operators
Which architecture fits in a Network Network
Operators?

SDN CONTROLLER
Big black box controlling the network

Centralize functionalities to enable
automation
Core Network Evolution
Telefónica I+D, Global CTO

Define simple standard
interfaces
22
The path towards a unified network provisioning
architecture

• 

Path towards a unified network provisioning architecture

• 

Key building block of such unified network provisioning architecture are:

§ 
§ 

Multiservice provisioning over pseudowires
Automated multidomain/vendor/layer operation by signaling

Network configuration interface: Multivendor edge nodes configuration (e.g OLT and BRAS,
IP core routers, etc) by standard interfaces (e.g OpenFlow)
§  IT and network SDN orchestration: Coordinated network and datacenter resources control
according to service requirements (e.g orchestrated Virtual Machine transfer among
datacenters)
§  Network-Service API: Application level API hiding details of the network
§ 

Service
Management
Systems

Internet

CDN

Cloud

Business

Network-Service API

Multiservice network provisioning system
(SDN Orchestrator)

Network
Provisioning

Metro
Node
Vendor A

Core Network
Nodes

Voice

Metro
Node
Vendor B

IP
Node
Vendor C

IP
Node
Vendor D

IP
Node
Vendor E

Optical
Node
Vendor A

Optical
Node
Vendor B

Optical
Node
Vendor C

Standard signaling mechanisms running over network nodes enabling flexible
networking and automated network provisioning over different network segments
(metro, core IP, optical transport) including multiple vendors

Core Network Evolution
Telefónica I+D, Global CTO

23

Network configuration
interface
SDN controller definition

•  NBI Interface to interface
applications
•  SBI with three main functionalities:

GUI/NMS/Application

§  Discover network resources

North Bound Interface

•  Example: IGP, BGP-LS, etc.

§  Provision the request
SDN Controller

•  Ej: OF, PCEP, NetConf, etc.

§  Monitor the network.
Discovery

Provisioning

Monitoring

Physical Network

P. Pan, IPOP 2012

Core Network Evolution
Telefónica I+D, Global CTO

24
Main actions to be taken by the SDN controller in
E2E networks
1. 

Discovery of network resources

2. 

Routing, path computation

3. 

Automated network orchestration in response to changing network
conditions and service requirements

4. 

Network resources abstraction to application layer

5. 

QoS control and performance monitoring

6. 

Multilayer interworking

7. 

Multidomain/multivendor network resources provisioning through different
control domains (e.g OpenFlow DataCenter, OpenFlow MAN, GMPLS
optical transport…)

E2E networks might be pure OpenFlow based one day, but
the migration process will take some time
Core Network Evolution
Telefónica I+D, Global CTO

25
SDN controller based on IETF building blocks
Applications (Internet, CDN, cloud…)

4- ALTO

3- ABNO controller

1- Topo Mod

2- PCE

5- OAM Handler

	
  
	
  
6- VNTM
	
  
	
  

SDN
Controller

7- Provisioning Manager
OPENFLOW
OPENFLOW
	
  
OpenFLow	
  
Data	
  
Center	
  
	
  
Core Network Evolution
Telefónica I+D, Global CTO

	
  
OpenFlow	
  
MAN	
  
Domain	
  
	
  

NETCONF

	
  
IP/MPLS	
  
core	
  
	
  

PCEP

OPENFLOW
	
  
GMPLS	
  
Op7cal	
  
Domains	
  

CLI

	
  
OpenFlow	
  
Op7cal	
  
Domain	
  

D. King, et al. “A PCE-based Architecture for Application-based
26
Network Operations”, draft-farrkingel-pce-abno-architecture-06

	
  
MPLS	
  
MAN	
  
Topology Module

O. Gonzalez de Dios, V. López, C. Haya, C. Liou, P. Pan, G.
Grammel, J. Antich, J.P. Fernández-Palacios: Traffic Engineering
Database dissemination for Multi-layer SDN orchestration, in
European Conference on Optical Communication (ECOC), Mo.
4.E.2, Sep 2013.

•  Topology module has two main functions:

§  Import the network state
§  Export topologicla information to lements like PCE, VNTM or ALTO.

Topology Module
Topology
Updater

Web
Service

VNTM

Information
Retriever

XML Parser

ALTO
Server

BGP-LS

PCE

OSPF

Network
Elements

Topology Database
IP View

Unique
Topology
Database

Interlayer View
Transport View

Adapters
Core Network Evolution
Telefónica I+D, Global CTO

27
04

Concluding Remarks
Key messages
1

Video and cloud computing demands are stressing
the network

2

Flexible technologies are mandatory in transport
network evolution

3

Horizontal and vertical orchestration allows an
automatic network provisioning of network services in
layered networks

4

SDN can help to define abstract interfaces for services
thus reducing NMS complexity

5

SDN can not be a big black box, thus standard building
blocks and interfaces are required and SDN should
delegate functionalities to control plane

Core Network Evolution
Telefónica I+D, Global CTO

29
Core Network Evolution
Telefónica I+D, Global CTO

30

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  • 1. SDN for Network Operators Víctor López Core Network Evolution Global CTO Unit
  • 2. Index 01 02 03 04 Core Network Evolution Telefónica I+D, Global CTO Cloud-Ready Transport Networks The SDN Concept SDN for Network Operators Concluding Remarks 2
  • 4. Cloud-ready Transport Network Approach Cloud services Multilayer Coordination Network Routing, monitoring and automated Photonic network configuration Photonic control plane GMPLS + PCE Flexible Transport Optical Network Network Cross-Stratum Horizontal and Vertical Orchestration IP/MPLS Cross-Stratum Optimization Optimization Routing, monitoring and automated IP configuration Signalling L. M. Contreras, et all: “Towards Cloud-Ready Transport Networks”, in IEEE Communications Magazine, September 2012, Vol. 50, Issue. 9, pp. 48 - 55. Core Network Evolution Telefónica I+D, Global CTO 4
  • 5. Cloud-ready Network Approach §  The target is an E2E network able to perform automated connectivity control between end users and cloud data centers Cloud Ready Networks rely on two main technological pillars §  This innovative network model aims to: ü  Accelerate service provisioning and performance monitoring ü  Enable on-demand connectivity configurations (e.g bandwidth) by end users Network Control Flexible Transport Network ü  Optimize both cloud costs and power consumption ü  Guarantee the required QoS/QoE (…) for real time and video services Cloud Services Leverage of API NetworkControl Network-Cloud interface: new services development Elasticity & QoS Resource Mngmt E2E MPLS photonic network Flexible transport network IP control and resource allocation (e.g IP v6) IP Forwarding CPE Mobile and Fixed Access Networks E2E MPLS OPTICAL TRANSPORT Core Network Evolution Telefónica I+D, Global CTO 5 Capacity
  • 6. Traditional core/backbone network operation is very complex and expensive •  Core network operation is not adapted to flexible networking §  Multiple manual configuration actions are needed in core network nodes §  Network solutions from different vendors typically use particularized Network Management System (NMS) implementations §  Very long service provisioning times CURRENT APPROACH FOR NETWORK PROVISIONING Service Management Systems Internet Voice CDN Cloud Business Collection of Umbrella Systems (see next) Network Provisioning Systems Core Network Nodes Core Network Evolution Telefónica I+D, Global CTO Metro NMS IP Core NMS Complex and long workflows for network provisioning over different segments (metro, IP core, Optical transport) requiring multiple configurations over different NMS Optical Transport NMSs NMS NMS NMS NMS NMS NMS NMS NMS Vendor A Vendor B Vendor C Vendor D Vendor E Vendor A Vendor B Vendor C IP IP Metro IP Optical Optical Optical Metro Node Node Node Node Node Node Node Node Vendor A Vendor B Vendor C Vendor D Vendor E Vendor A Vendor B Vendor C 6
  • 7. Now… Really complex •  Example: Telefonica Spain has 269 management systems and 795 interactions •  Plenty of Proprietary interfaces Core Network Evolution Telefónica I+D, Global CTO 7
  • 8. Cloud Computing – Hype Cycle Souce: Gartner (2012) Core Network Evolution Telefónica I+D, Global CTO 8
  • 9. Inter-data center traffic •  Standard cloud migration process in companies: 1.  Virtualization VM VM VM VM VM Hipervisor 2.  Private cloud Autoprovisioning Service Service VM VM VM VM VM 3.  Hybrid cloud Hipervisor Autoprovisioning Autoprovisioning Service Service Service VM VM VM VM VM VM VM VM VM VM Hipervisor Core Network Evolution Telefónica I+D, Global CTO Secure VPN 9 Service Hipervisor
  • 10. Hybrid Cloud Computing - Elasticity •  Traditional IT and network dimensioning yields to this situations: Over-provisioning Capacity Resources Resources Under-provisioning Capacity •  The network and the cloud must adapt to the end users requirements. t Resources t Capacity t Core Network Evolution Telefónica I+D, Global CTO 10
  • 11. Cloud Computing imposes new needs to fit by network providers •  Services hosted in datacenters spread at the network border •  Extremely high temporal bandwidth •  •  variability is shown in cloud traffic demand Strong need for high-capacity and ultra-long haul datacenter interconnection Service experience in cloud must be equivalent to the one perceived locally Source: “Towards predictable DC networks”, SIGCOMM, 2011 1Gbps 100Mbps Source: Amazon EC2 performance (http://bit.ly/48Wui) Impact on two main network axis: Capacity and Elasticity Core Network Evolution Telefónica I+D, Global CTO 11
  • 12. The Vision User-centric connectivity experience To adapt our offer to users necessities A network that delivers the best connectivity experience in an efficient and flexible way Insight capabilities Mouldable infrastructures To understand changes inside-out and be able to decide in real time To cope with quick changes and uncertainty Core Network Evolution Telefónica I+D, Global CTO 12
  • 14. Software Defined Networking SDN Open interfaces (OpenFlow) for instructing the boxes what to do Network equipment as Black boxes FEATURE FEATURE OPERATING SYSTEM FEATURE SPECIALIZED PACKET FORWARDING HARDWARE FEATURE FEATURE FEATURE OPERATING SYSTEM OPERATING SYSTEM SPECIALIZED PACKET FORWARDING HARDWARE SPECIALIZED PACKET FORWARDING HARDWARE FEATURE FEATURE OPERATING SYSTEM SPECIALIZED PACKET FORWARDING HARDWARE SDN Boxes with autonomous behaviour FEATUR E FEATUR E OPERATING SYSTEM FEATUR E FEATUR E SPECIALIZED PACKET FORWARDING HARDWARE OPERATING SYSTEM SPECIALIZED PACKET FORWARDING HARDWARE FEATUR E FEATUR E OPERATING SYSTEM FEATUR E FEATUR E Decisions are taken out of the box SDN SPECIALIZED PACKET FORWARDING HARDWARE OPERATING SYSTEM SPECIALIZED PACKET FORWARDING HARDWARE Simpler OSS to manage the SDN controller Adapting OSS to manage black boxes Core Network Evolution Telefónica I+D, Global CTO 14
  • 15. The Ossified Network •  Many complex functions •  baked into the infrastructure OSPF, BGP, multicast, differentiated services §  Traffic Engineering, NAT, firewalls, MPLS, redundant layers, … •  An industry with a “mainframe-mentality”, reluctant to change Core Network Evolution Telefónica I+D, Global CTO 15 15  
  • 16. Extracting Simplicity vs Mastering Complexity Core Network Evolution Telefónica I+D, Global CTO 16
  • 17. Out of the Boxes •  The network does not need to be •  •  FEATURE OPERATING SYSTEM seen any longer as a composition of individual elements User applications interact with the network controller(s) The network becomes a single entity FEATURE FEATURE SPECIALIZED PACKET FORWARDING HARDWARE OPERATING SYSTEM SPECIALIZED PACKET FORWARDING HARDWARE FEATURE FEATURE SPECIALIZED PACKET FORWARDING HARDWARE •  We can apply different levels of abstraction §  Think of a network design flow §  And even an IDE 17 FEATURE FEATURE OPERATING SYSTEM OPERATING SYSTEM §  Suitable to be programmed §  Aligned with current IT practices Core Network Evolution Telefónica I+D, Global CTO FEATURE SPECIALIZED PACKET FORWARDING HARDWARE
  • 18. SDN Principles §  Even bypassing conventional layered protocols and their configuration Core Network Evolution Telefónica I+D, Global CTO 18 ." •  •  •  App" SDN Control Plane Software! •  Functions are split between per-packet rules on the switch and high-level decisions at the controller Open interface between control and data plane Open interface to the control plane Controllers actually program the network App" §  Simple packet processing elements (switches) §  Software-based controlling components (controllers) App" App" •  Make network behaviour programmable §  Beyond individual boxes •  Fully decouple data and control planes Switch " Switch" Switch" Switch" Switch"
  • 19. The SDN Ocean Are w Core Network Evolution Telefónica I+D, Global CTO 19 e crea tin of pro g a new se tocols t ?
  • 20. Basic SDN Approach for OpenFlow Domains Application Layer API ALTO TED SDN orchestrator OAM Handler         SDN Controller SDN CONTROLLER VNTM PCE Provisioning Manager OPENFLOW   Infrastructure     Layer  (e.g   DataCenter)     Core Network Evolution Telefónica I+D, Global CTO OpenFlow is based on the concept of actions that are applied to each packet of a given flow (Ethernet-level addresses, VLAN tags, IP addresses, MPLS labels or transport-level ports). The actions taken by SDN the controller comprise: inserting and removing tags (layer 2), performing routing (layer 3) and also providing differentiated treatment to packets (QoS) •  •  We can not have a centralized entity to configure all network devices. We need controllers which can talk each other. Is this another control plane? 20
  • 22. Which architecture fits in a Network Network Operators? SDN CONTROLLER Big black box controlling the network Centralize functionalities to enable automation Core Network Evolution Telefónica I+D, Global CTO Define simple standard interfaces 22
  • 23. The path towards a unified network provisioning architecture •  Path towards a unified network provisioning architecture •  Key building block of such unified network provisioning architecture are: §  §  Multiservice provisioning over pseudowires Automated multidomain/vendor/layer operation by signaling Network configuration interface: Multivendor edge nodes configuration (e.g OLT and BRAS, IP core routers, etc) by standard interfaces (e.g OpenFlow) §  IT and network SDN orchestration: Coordinated network and datacenter resources control according to service requirements (e.g orchestrated Virtual Machine transfer among datacenters) §  Network-Service API: Application level API hiding details of the network §  Service Management Systems Internet CDN Cloud Business Network-Service API Multiservice network provisioning system (SDN Orchestrator) Network Provisioning Metro Node Vendor A Core Network Nodes Voice Metro Node Vendor B IP Node Vendor C IP Node Vendor D IP Node Vendor E Optical Node Vendor A Optical Node Vendor B Optical Node Vendor C Standard signaling mechanisms running over network nodes enabling flexible networking and automated network provisioning over different network segments (metro, core IP, optical transport) including multiple vendors Core Network Evolution Telefónica I+D, Global CTO 23 Network configuration interface
  • 24. SDN controller definition •  NBI Interface to interface applications •  SBI with three main functionalities: GUI/NMS/Application §  Discover network resources North Bound Interface •  Example: IGP, BGP-LS, etc. §  Provision the request SDN Controller •  Ej: OF, PCEP, NetConf, etc. §  Monitor the network. Discovery Provisioning Monitoring Physical Network P. Pan, IPOP 2012 Core Network Evolution Telefónica I+D, Global CTO 24
  • 25. Main actions to be taken by the SDN controller in E2E networks 1.  Discovery of network resources 2.  Routing, path computation 3.  Automated network orchestration in response to changing network conditions and service requirements 4.  Network resources abstraction to application layer 5.  QoS control and performance monitoring 6.  Multilayer interworking 7.  Multidomain/multivendor network resources provisioning through different control domains (e.g OpenFlow DataCenter, OpenFlow MAN, GMPLS optical transport…) E2E networks might be pure OpenFlow based one day, but the migration process will take some time Core Network Evolution Telefónica I+D, Global CTO 25
  • 26. SDN controller based on IETF building blocks Applications (Internet, CDN, cloud…) 4- ALTO 3- ABNO controller 1- Topo Mod 2- PCE 5- OAM Handler     6- VNTM     SDN Controller 7- Provisioning Manager OPENFLOW OPENFLOW   OpenFLow   Data   Center     Core Network Evolution Telefónica I+D, Global CTO   OpenFlow   MAN   Domain     NETCONF   IP/MPLS   core     PCEP OPENFLOW   GMPLS   Op7cal   Domains   CLI   OpenFlow   Op7cal   Domain   D. King, et al. “A PCE-based Architecture for Application-based 26 Network Operations”, draft-farrkingel-pce-abno-architecture-06   MPLS   MAN  
  • 27. Topology Module O. Gonzalez de Dios, V. López, C. Haya, C. Liou, P. Pan, G. Grammel, J. Antich, J.P. Fernández-Palacios: Traffic Engineering Database dissemination for Multi-layer SDN orchestration, in European Conference on Optical Communication (ECOC), Mo. 4.E.2, Sep 2013. •  Topology module has two main functions: §  Import the network state §  Export topologicla information to lements like PCE, VNTM or ALTO. Topology Module Topology Updater Web Service VNTM Information Retriever XML Parser ALTO Server BGP-LS PCE OSPF Network Elements Topology Database IP View Unique Topology Database Interlayer View Transport View Adapters Core Network Evolution Telefónica I+D, Global CTO 27
  • 29. Key messages 1 Video and cloud computing demands are stressing the network 2 Flexible technologies are mandatory in transport network evolution 3 Horizontal and vertical orchestration allows an automatic network provisioning of network services in layered networks 4 SDN can help to define abstract interfaces for services thus reducing NMS complexity 5 SDN can not be a big black box, thus standard building blocks and interfaces are required and SDN should delegate functionalities to control plane Core Network Evolution Telefónica I+D, Global CTO 29