Transcript Diapositiva 1

Network Virtualization issues from a telecom
operator perspective.
Outcomes from IST 4WARD Project
TELEFÓNICA I+D
Version 1.0. Date: June, 9th 2009
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© 2008
2007 Telefónica Investigación y Desarrollo, S.A. Unipersonal
Index
01
IST WARD Project
02
Network Virtualization from an operator’s perspective
03
Challenges for Core Network Virtualization
04
Conclusions
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Index
01
IST WARD Project
02
Network Virtualization from an operator’s perspective
03
Challenges for Core Network Virtualization
04
Conclusions
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© 2007 Telefónica Investigación y Desarrollo, S.A. Unipersonal
ARD
4W
4WARD Project
General Information

4WARD Project: Combination of clean-slate
approaches to address the Network of the Future:
—
Let 1000 Networks Bloom: co-existence of a multitude of
interoperable network.
—
Let Networks Manage Themselves: self-managed networks.
Ericsson
Nokia-Siemens-Networks
VTT
Ericsson
KTH
SICS
Canada
NEC
Univ. of
Lancaster
Univ. of Surrey
Ericsson
Finland
Alcatel-Lucent
Deutsche Telecom
Ericsson
Nokia-Siemens-Networks
Tu Berlin
Univ. of Bremen
Univ. of Karlsruhe
UNiv. of Paderborn
Sweden
Norway
Telekomunikacja Polska
WIT
Ireland
Alcatel-Lucent
France Telecom
GET-INT
LIP6
—
Let Networks Be Information-Centric: information objects and
services are mobile and distributed throughout the network.
Germany
France
Austria
Switzerland
Romania
Technion
Italia
IST-TUL
PTIN
gal
Let a Network Path Be an Active Unit: Customized and selfconfigurable transport services (resilience, mobility, multi-path,
security, compression, performance).
Portu
—
Siemens
TPUCN
Poland
UK
Spain
Univ. of Basel
SAGO
Israel
Telcom Italia
US
Rutgers
university
Robotiker-Tecnalia
Telefonica
Project duration 1.1.2008 – 31.12.2009
Size: around 23M€
Consortium: 37 partners
http://www.4ward-project.eu/
Aims at supporting a family of dependable and interoperable networks providing direct and
ubiquitous access to information following a clean slate approach

According to Paulo de Sousa (European Commission), “4WARD is more than a simple
project, it is a long term research program… it is the European main initiative to design
Future networks”.
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4WARD Project
Network Virtualization within 4WARD Project
Virtualization has gained sufficient momentum as one of the key
paradigms for future networking
Physical
Infrastructure
Within 4WARD, an architecture for network
virtualization is being developed.

Use virtualization as basis for an innovationfriendly, open architecture!
Co-existence
Virtualization of Resources
(partitioning of physical infrastructure into “slices”)
Virtualized
Substrate
Provisioning of Virtual Networks
(on-demand instantiation of virtual networks)
(separate, but interworking
where desired)
Easier
deployment of new networks in the
future

Systematic approach to network virtualization
Virtual
Network
Virtual
Network
Management of Virtual Networks
The aim is to enable the co-existence of heterogeneous network architectures over
a common infrastructure, to foster the development of Future Internet paradigms.
TID’s goal is to achieve a technology transfer and to work out virtualization scenarios
with
fundamental
assumptions
from antransfer
operator’s
new revenues
TID’s
goal is to achieve
a technology
andperspective:
to work out virtualization
generation
income) and
operational
excellence
(OPEX/CAPEX).
scenarios
with(net
fundamental
assumptions
from
an operator’s
perspective.
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4WARD Project
Network Virtualization objectives and activities
Service Provider
Service
Model
Architecture
Blueprints
Instantiating Virtual
Networks On Demand
Download
Custom
Protocols
Service
Requirements
Topology &
Provisioning
Scalable
Resource
Discovery
Infrastructure Providers

Objectives:
—
To define the architectural approach to provision virtual networks on a shared infrastructure
—
To develop the technologies that enable scalable instantiation and inter-operation of different networks
on a shared infrastructure
—
To demonstrate dynamically provisioned virtual networks in parallel using shared networking resources
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4WARD Project
Network virtualization architectural roles
ARD
4W
VNet operator
Infrastructure provider and virtual network
provider roles might be merged
VNet provider
Infrastructure
Provider

Infrastructure
Provider
Infrastructure
Provider
The virtualization ecosystem in 4WARD consists of three different players:

Infrastructure provider: it owns the physical resources, partitions them into isolated virtual resources (by
means of different methods) and offers them to virtual network providers.
—
Virtual network provider: it “leases” slices of virtualized infrastructure from different infrastructure
providers to compose complex virtual networks, and subsequently sells it to a virtual network operator.
—
Virtual network operator: it deploys its preferred architecture on top of the virtual network (i.e. it
implements appropriate protocol stacks) and operates the network on its own.
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Network virtualization heterogeneous scenario
In the real world, horizontally specialized players would coexist and
interwork with vertically integrated operators
End-to-End Deployment
Virtual Network Operator
VNet
VNet
VNet
VNet
Substrate
VNet
VNet
Phys. Net
Infrastructure
Broker
(optional)
Substrate
Legacy
Operator
Substrate
Vertically Integrated Operators
(virtualized networks)
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Substrate
Substrate
Infrastructure Providers
Index
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01
IST WARD Project
02
Network Virtualization from an operator’s perspective
03
Challenges for Core Network Virtualization
04
Conclusions
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Network Virtualization from an operator’s perspective
Rationale
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Network Virtualization
To introduce the data center virtualization techniques into
the core network to support the concurrent operation of
different networks on a single, shared infrastructure.
Concept
How it works?
Routers are “sliced” into virtual nodes.
Virtual nodes and links are composed into
Vnets to fulfil specific requirements.
Technology Rationale
Research-driven
Industry-driven
Within the research community, virtualization has become a key
enabler for the “Future Internet”: it will potentially allow the rapid
deployment of new network architectures and protocols.
Some vendors are already unveiling virtualization-enabling
products (e.g. Juniper’s TX Matrix Plus / JCS 1200).
Benefits, oportunities and threats
Providers
for an operatorInfrastructure
are still not clear.
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Each Vnet can be engineered to carry a
specific service or can be rented to a third
party.
Vnets are isolated from each other in
terms of QoS and control.
Network Virtualization from an operator’s perspective
Brainstorming of potential, future-term implications.
Realistic Business Models
Operational excellence
Single Network, Multiple
Services
Enabling the seamless deployment of whole new
networks over a common IP infrastructure.
VNet renting service to different
Business Units, or network
sharing in emerging markets.
Disruptive Business Models
Changes in the Value Chain
Cost optimization in case of regulatory separation
of business and infrastructure operator.
Network Externalization:
Freeze network investment
and become a VNet operator.
Potential new revenues
Allowing TCO reduction.
Dedicated VNets to third parties
Open garden: net- neutral added value access
services (e.g. for P2P networks)
VNO (VNet Operator): complete VNet
selling to a third party (ej. Google).
Search for income sharing.
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Future Internet Services
Support for new Internet Architectures
and interconnection models.
Event-driven global VNet creation
(e.g. soccer world championship).
VNet renting to specialized
micro-operators
(e.g. user generated networks).
Network Virtualization from an operator’s perspective
Self-reselling network operator

The typical approach of “logical infrastructures” is role splitting…

…an alternative would be network provider’s internal operational separation.
—
Multiple networks over the same infrastructure.
—
The operator keeps the control of the value chain.
—
Rapid service/architecture deployment (reduced time-to-market).
Per application
Network Planes
Internet
ARD
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Network Service Provider
IT-services
Media-services
Physical Network
Infrastructure Provider

Might have been a good thing e.g. for mobile but…
isn’t it too late?

What about statistical multiplexing? Do we lose it?

Doesn’t this approach go against the rule “postpone
non needed investments”?
Virtualization might anyway just become a new configurable feature of future IP routers
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Network Virtualization from an operator’s perspective
Vnet leasing as the next generation VPN
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What is the difference to current VPN services?
—
Routing capability?
—
Reconfigurability and control by the user?
—
Capability to deploy new architectures? (is this realistic?)
Network
Operator
Where is the business model?
Which kind of charging? Cheaper or more expensive than current VPNs?
—
Which would be the marging for the infrastructure provider?
—
Isn’t it usually cheaper to deploy your own core network?
—
Is a service-oriented income sharing feasible at all?
Vnet X
Core Network
Not clear business model yet.
Maybe in the long term?
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Network
Operator
Infrastructure & Network
Service Provider
—
© 2007 Telefónica Investigación y Desarrollo, S.A. Unipersonal
Network
Operator
Index
ARD
4W
01
IST WARD Project
02
Network Virtualization from an operator’s perspective
03
Challenges for Core Network Virtualization
04
Conclusions
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© 2007 Telefónica Investigación y Desarrollo, S.A. Unipersonal
ARD
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Challenges for Core Network Virtualization
Virtual Nodes and Virtual Links in the core network

Virtual Nodes in the core:
—
Virtual nodes would be deployed both at the edges (to provide
PoPs) and in the core (to provide routing capability).
—
Router management and configuration would be leased to the
Vnet client (e.g. to perform its own routing or QoS decisions).
—
Router providers are starting to develop virtualization products
Highly Virtualizable
core IP nodes
(e.g. Juniper announced a new “core virtualization” strategy with the TX Matrix Plus, Feb 09)

Virtual Links in the core :
—
—
—
—
From a transport point of view, several link virtualisation
techniques (e.g. ATM, 802.1q, MPLS) could be used.
IP/MPLS core
Virtualizable
Virtualizable
IP edge nodes
Virtual links can be instantiated as transport paths between
IP edge nodes
source and destination (e.g. control protocol).
If each node in the end-to-end path maintains a session state,
potential scalability issues may arise.
A
How to assure QoS and isolation within Vlinks?
Scalability and isolation (QoS)
challenges for link virtualization
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Physic
Virtual
Virtual al link
node Substrate
interface
node
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C
B
Virtual
link
Virtual link
aggregate
Challenges for Core Network Virtualization
Link Virtualization with MPLS

ARD
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A two level virtualization technique would be desired to solve the scalability issue
—
A virtual link aggregate merges all virtual links which follow a common path between source and
destination virtual nodes. Awareness of virtual links is only required from end points.
—
Core routers perform virtual link aggregates forwarding. Edge nodes perform termination of virtual
link aggregates and virtualisation.
Physical
link
Virtual
link
Virtual link
aggregate /
Virtual path

But… how to deal with link isolation? Are current QoS strategies enough? Do they scale?

Alternative approaches on how to proceed :
—
Design a VNet-specific link virtualisation solution from scratch: solving scalability & QoS issues.
—
Adapting and extending available solution (e.g. MPLS) taking VNet requirements into account.
—
Use available solutions (e.g.MPLS) unchanged (with the identified limits).
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Index
ARD
4W
01
IST WARD Project
02
Network Virtualization from an operator’s perspective
03
Challenges for Core Network Virtualization
04
Conclusions
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Conclusion

Virtualization has a strong potential (at least to move research forces) to play a key
role in the Future Internet.

Key messages from an operator’s perspective:

—
Business use cases for a telecom operator are far from being clear.
—
There are potential scalability and QoS challenges in the deployment of Virtual Networks
in current core networks.
4WARD aims at providing both demonstration facilities and developing realistic
business cases for network virtualization from an industrial perspective.
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© 2007 Telefónica Investigación y Desarrollo, S.A. Unipersonal
TELEFÓNICA I+D
© 2008
2007 Telefónica Investigación y Desarrollo, S.A. Unipersonal