michael roth - vice president r&d eu-japan workshop, brussels, april 18 th 2013 need to extend...
TRANSCRIPT
Michael Roth - Vice President R&D
EU-Japan Workshop, Brussels, April 18th 2013
Need to extend Virtualization to Optical Transport Domain
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Outline
• Introduction – ONE EU Project
• Optical Network Virtualization
• Prospects, Challenges & Solutions
• Summary
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Challenges in Multivendor setupCisco IP-NMS/OSS
JUNIPER IP-NMS/OSS
Ciena T-NMS/OSS
Multi-layer interoperability
problem Multi-vendor interoperability
problem
ALU IP-NMS/OSS
ADVA T-NMS/OSS
ALU T-NMS/OSS
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ONE Project
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Software-Defined Networks (SDN)
SDO + SDN = Software-Defined Optical Networks (SDON).SDO + SDN = Software-Defined Optical Networks (SDON).
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Software Defined Networking
• Software-defined networking (SDN) is a current trend for future Network development of any kind
• Key objective: Virtualize the network and converge the orchestration of the virtualized networks with VMs in the data centers to create a true network-supported "Cloud"
• Key component: Open interface between a (centralized) control and the forwarding plane for SDN.
• One possible solution: OpenFlow (defined by ONF)• Focused on packet networks – emerging to Transport
• Assumed/hoped/dreamed key benefits: • Simplicity• Vendor independency• Reduced costs (CAPEX & OPEX)• Complete Network overview• Simplified Operation• …
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Optical OpenFlow
GMPLS functions can augment OpenFlow to mask optical layer complexity. GMPLS functions can augment OpenFlow to mask optical layer complexity.
Cooperation with
First ROADM-
based OpenFlow
Networking
Testbed
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Virtualization
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Cloud Data Centers
Virtualization is a key concept to pool servers, storage and appliancesand share them in a flexible and dynamic way.
Virtualization is a key concept to pool servers, storage and appliancesand share them in a flexible and dynamic way.
VirtualserverVirtualserverVirtual
networkVirtual
network
VirtualstorageVirtualstorage
Orchestration of IT & network resourcesOrchestration of IT & network resources
Storage pool Fabric interconnect Server pool
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Network Virtualization - Definition
Any form of partitioning or combining a set of network resources, and presenting it in an
abstracted form to users such that each user, through his set of resources, has a unique,
separate view of the network. [Wang et al., JLT, 12/2012]
User: Data center tenants, virtual machines, workloads or applications.Resources: Fundamental (nodes, links) or derived (topologies), can be virtualized recursively.Requirements: User isolation, configuration independence, elasticity and programmability.
Virtual Network 1
Virtual Network 2
Networks 1 & 2
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Use Cases
Bandwidth calendaring Cloud bursting
Secure multi-tenancyWorkload balancing
Transactional nature of DC-to-DC traffic (bulk data transfers)offers opportunities for optical bandwidth-on-demand.
Transactional nature of DC-to-DC traffic (bulk data transfers)offers opportunities for optical bandwidth-on-demand.
Cloud DC
PrivateDatacenters
Tenant 1
Tenant 2Load Load
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Optical Virtualization ChallengesPacket Switch Optical -Switch
Signal format Digital electronic Analog optical
Signal structure Ethernet frames Signal dependent
Payload visibility Yes No
Topology discovery In-band (e.g. LLDP) Out-of band (e.g. OSC)
Fabric connectivity Any-to-any Constrained
Path feasibility Implicit Dep. on signal quality
Path set-up Any order Sequential
Analog nature and switching constraints make optical networks difficult to virtualize.Analog nature and switching constraints make optical networks difficult to virtualize.
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Optical Virtualization – Two Extremes
• Virtualization on fundamental level
• All nodes and links are exposed
• Direct hardware representation
• Highest flexibility for tenants/applications
• Users need to control/understand optical layer
• Virtualization on highest derived level
• Network abstracted as one large switch
• Can be -, circuit or packet switch
• Users see switch as black box
• Internal structure & optical layer are hidden
Compromise necessary: Hiding optical complexity while exposing topology.Compromise necessary: Hiding optical complexity while exposing topology.
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Optical Virtualization – SDN Control
Ab
str
acti
on
Topology DB
Flow DBResource
DB
Management
Policy DB
Control Database
Network Controller
Network Hypervisor
Restful APIwith Extensions
vNetwork Controller vNetwork Controller
Physi
cal re
ssourc
es
Deri
ved t
opolo
gy
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The need for flexible optical networks STRAUSS EU-Japan Project
• Fixed-grid DWDM transport networks, electrical packet switching and aggregation technologies are not efficient for data rates beyond 100 Gbps.
• Elastic optical networks (EON) and optical packet switching (OPS) are key technologies for addressing these issues
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Data Center
Ethernet Switch
OPS
BVT
Data Center
Ethernet Switch
OPS
BVTElastic optical network
Service A
Service B
Service C
Service A
Service B
Service C
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STRAUSS overall architecture
16
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Research Activities
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Summary
• Optical network virtualization offers cloud providers & tenants
high-bandwidth, low-latency connectivity on demand.
• Different models for optical network virtualization exist.
• A compromise between hiding the optical complexity and
exposing the optical topology is required.
• Open approaches based on standardized GMPLS or emerging
OpenFlow technologies are possible.
Thank you
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