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8/13/2019 Mon 2-4 Leymann
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An SDN based Network Architecture
for Service Providers
Nicolai Leymann, Deutsche Telekom AG
8/13/2019 Mon 2-4 Leymann
http://slidepdf.com/reader/full/mon-2-4-leymann 2/14
SDN Based Network Architecture.
Agenda.
1. Principles, Motivation and Limitations
2. Use Cases
3. Architecture Blueprint
4. Summary
11/19/2013– public– Leymann/SDN & NFV Architecture 2
8/13/2019 Mon 2-4 Leymann
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SDN Based Network Architecture.
Principles.
1. Make sure that you have a clear understanding on SDN, NFV and friends and don’t
believe what vendors are promising
2. One integrated strategy for Software Defined Networking, Network Function
Virtualization, Service Chaining and Data Center deployments.
3. Virtualization of network functions on data center hardware should be the standard
model when introducing new technologies.
4. Implement open interfaces to ensure programmability of thenetwork fabric but don’t limit to a specific protocol or standard.
5. SDN enables different level of network control. Most attractive use cases for IP flow-level
control (e.g. OpenFlow) are at the network edge, e.g. service chaining.
6. Accelerate the efforts to implement network aware end to end service orchestration ofservices and resources for optimal placement.
7. Use standardized and common data center technologies and processes to implement
network functions.
8. Use in case of clear benefits, not because it’s a fancy new technology.
Strategy N
e t w o r k F u n c t i o n
V
i r t u a l i z a t i o n
D a t a C e n t
e r
S o f t w a r e D e f
i n e d
N e t w o r
k i n g
11/19/2013– public– Leymann/SDN & NFV Architecture 3
8/13/2019 Mon 2-4 Leymann
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SDN Based Network Architecture.
Impact Analyses.
11/19/2013– public– Leymann/SDN & NFV Architecture 4
8/13/2019 Mon 2-4 Leymann
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SDN Based Network Architecture.
Remove Limits of Existing Models.
Vendor dependencies
restricts development.
Scalability limits are
restricting growth.
Complexity limits
development and
and hindersflexibility.
SDN & NFV
Paradigms
Universal API:
Standardized API as common base for development of
network services and applications.
Central Control Plane:
Universal access for controlling
activities within the network
remove
limits of
existing
models
Abstraction:Separation of Forwarding and
Control Plane
Remove dependencies between
hardware and implementation.
Programmability:
Network and services can be
programmed
11/19/2013– public– Leymann/SDN & NFV Architecture 5
8/13/2019 Mon 2-4 Leymann
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Standard x86 based
hardware with flexibleand elastic resource
provisioning
(computing
performance,
throughput, …)
Data Center
Separated control
/data planes withstandardized south
and northbound
interfaces to control
traffic. Decoupling of
life cycles.
SDN
NFV
1
SDN Based Network Architecture.
Bringing Everything Together.
23
Virtualization ofnetwork functionaliy
(e.g. PPP termination,
Firewalling, Parental
Control)
NFV1
23 Virtualized
Data
Center
SDN
11/19/2013– public– Leymann/SDN & NFV Architecture 6
„Sweet
Spot“
End-to-End Use Case
(orchestration of NFV services in
a Data Center). NFV can be seen
as a use case of combining
virtualization in DC and Software
Defined Networking.
8/13/2019 Mon 2-4 Leymann
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SDN Based Network Architecture.
Key Aspects.
Decoupling of Control Plane and Data Plane.
Application are steering the traffic and are interacting with the forwarding nodes.
Flexible Control of all network functionality (not focused on forwarding).
Moving forward towards a „NOS“ – Network Operating System.
Network Functions (like firewalling) are running on a virtualized infrastructure. Use of standard data center (based on x86 based hardware) for all services.
Complex functionality for subset of services/customers not on every network node.
Respond on changing requests via horizontal scaling.
Use of standard x86 based server and abstraction of physical infrastructure. Use of a common resource pool.
Decoupling of hardware and application life cycles.
Simplification and automation of provisioning processes for Cloud services.
Opex & Capex savings through lower energy & maintenance costs.
Software
DefinedNetworking
Virtualization(Data Center)
NetworkFunction
Virtualization
11/19/2013– public– Leymann/SDN & NFV Architecture 7
8/13/2019 Mon 2-4 Leymann
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8/13/2019 Mon 2-4 Leymann
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SDN Based Network Architecture.
Use Case: Classification, Steering and Service Chaining.
Peering
IP Backbone
LERLER
Data
Center
BNG
Redirect
Need to dynamically classify
and steer traffic based on
customer demands towards
Data Center
Data Center implements
service chaining (e.g. traffic
scrubbing and analyses)
Traffic classification andsteering part of Service
Chaining architecture
End-to-End Orchestration needsto take distributedclassification and redirection
into account
RemarksDynamic Traffic Steering and Service Chaining
Firewall
Scrubber
Antivirus
Analyses
Customer
11/19/2013– public– Leymann/SDN & NFV Architecture 9
8/13/2019 Mon 2-4 Leymann
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SDN Based Network Architecture.
Architecture Blueprint (1 of 2).
NetworkVirtualized Data Center
Hypervisor (KVM)
VM VMVM VMAPP
OSVMAPP
OSVMAPP
OS
Compute Storage Network
OpenStack Services
API
GlanceNova NeutronSwift
Infrastruktur
Install&
ConfigSys
Hypervisor (KVM)
VMVMVM VMVMVMVMVMVM VMAPP
OSVMAPP
OSVMAPP
OSVMAPP
OSVMVMAPPAPP
OSOSVMAPP
OSVMVMAPPAPP
OSOSVMAPP
OSVMVMAPPAPP
OSOS
ComputeCompute StorageStorage NetworkNetwork
OpenStack Services
APIAPI
GlanceGlanceNovaNova NeutronNeutronSwiftSwift
Infrastruktur
Install&
ConfigSys
Infrastruktur
Install&
ConfigSys
Orchestration
APP APP APP APP
Abstraction Layer
Controller
Adapter Adapter Adapter
Orchestration
End-to-End Orchestration
Controller
11/19/2013– public– Leymann/SDN & NFV Architecture 10
8/13/2019 Mon 2-4 Leymann
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SDN Based Network Architecture.
Architecture Blueprint (2 of 2).
All services are virtualized
Standardized elastic and scalable data center(s) for allservices
Single (small number) of standized interfaces – north
and southbound
The Bright Future
Abstraction layer needs to take
non virtualized hardware into
account
Integration of legacy software and hardware (fortransition period) necessary
Abstraction
Not everything can be virtualized
Legacy hardware not going to disappear in short term
Service specific Data Centers in deployment and needto be migrated
large „zoo“ of different control planes and interfaces
Reality
End-to-End Orchestration of services and network
(including connectivity) View on network and services (and network services in
DC) crossing (todays) organizational borders
Orchestration
Architecture Blueprint
11/19/2013– public– Leymann/SDN & NFV Architecture 11
8/13/2019 Mon 2-4 Leymann
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SDN Based Network Architecture.
Success Factors.
Common vision
from IT and NT.
Open minded discussion and flexibility are key factors for success. Architecture and strategyshould be seen as enablers for future networks and services.
Take organizational
impact into account
Not religious on
protocols and
solutions.
Move as much as
possible to new
architecture.
Clear path towards
Virtualization.
Factors for Success
11/19/2013– public– Leymann/SDN & NFV Architecture 12
8/13/2019 Mon 2-4 Leymann
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SDN Based Network Architecture.
Summary.
Higher flexibility for network and service deployments (faster „time to market“) Possibility to provide services end-to-end and ..
Interact with the underlying network through a single orchestration
Industry still in „gold rush mood“, many promises
Many players, many interpretations of SDN
Impact not only on technology level but also on organizational structures
Technologies like SDN and NFV are enablers for new services and more flexibility
Network evolution towards a software based/centric approach
Paradigm shift within IT industry (vendors, telcos, …)
Evolution
Opportunities
Challenges
11/19/2013– public– Leymann/SDN & NFV Architecture 13
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