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Aihua GuoMarch 2014
Network Virtualization
© 2014 ADVA Optical Networking. All rights reserved. Confidential.22
Network Virtualization
• Using software-based abstraction to enable the creation of logically isolated virtual network representations atop physical networks
• Enabling new applications, operation models and business opportunities
© 2014 ADVA Optical Networking. All rights reserved. Confidential.33
Optical Transport Networks
Optical transport networks increasingly asked to provide dynamic, high bandwidth, programmable services
Optical transport networks increasingly asked to provide dynamic, high bandwidth, programmable services
Packet Routers
OTN Switches
UNI/NNI
NMS
Optical Domain
XPD
RX
PD
RX
PD
RX
PD
R
© 2014 ADVA Optical Networking. All rights reserved. Confidential.44
Virtualizing the Optical Transport Networks
• Real challenges of optical networks• Optical networks are usually built as vendor islands• Many deployed vendor-proprietary transport technologies• Element complexity, technology complexity, OA&M complexity ...
• Realities• Optical networks largely service packet and OTN networks today• Transport networks are centrally managed, familiar with
managing complexity
• What‘s important to optical transport network virtualization• Complexity hiding; what happens in optical networks, stays in
optical networks• Finding the appropriate level of abstraction is key to virtualization
© 2014 ADVA Optical Networking. All rights reserved. Confidential.55
Virtualization Can Start Real Simple...• Virtualize the optical networks as a single virtual switch to its clients
SDN Adapter
Virtual Networks
But, considering the following client‘s requirement to configure a virtual network
• Bandwidth• Latency• Fate sharing• Recovery capabilities, etc.
Plus the optical network complexity• Connectivity constraint, aka switch asymmetricity• Optical impairment• ROADMs, CDC...
...is simple connectivity still sufficient for optical network virtualization?
© 2014 ADVA Optical Networking. All rights reserved. Confidential.66
Virtual Overlay Networks
• Simple connectivity no longer enough; richer model needed
• Endpoints are nodes in a topology; bandwidth and latency are attributes of links and nodes in a topology; fate sharing determined by the structure of a topology; recovery capabilities for a flow determined by the containing topology ...
© 2014 ADVA Optical Networking. All rights reserved. Confidential.77
Virtual Overlay Networks• Virtualization may be achieved by means of constructing virtual
overlay networks• Server network aspects expressed to client network in client terms
• Client network methods and techniques can remain unchanged• True for traditional EMS/NMS, distributed control plane, emerging SDN
• Overlay networks already much in use within client layer SDN today• Reuse established expertise in the optical domain: PCE, traffic
engineering...
© 2014 ADVA Optical Networking. All rights reserved. Confidential.88
Network Scope Virtualization• Virtual overlay networks may be presented in different ways...
Server
Client
Virtual Link
Server
Client
Virtual Node
Connectivity Information
• Paths in the optical domain become links in its client‘s virtual networks
OR
Or, a combination of both…
• Optical networks become virtual nodes in its client‘s virtual networks
© 2014 ADVA Optical Networking. All rights reserved. Confidential.99
Node Scope Virtualization• Optical elements have wide range of network and node scope
constraints• Wavelength continuity (e.g. optically transparent nodes)• Optical impairment• Fixed filter structures (e.g. endpoint transponders fixed to specific
degree)• Regenerator diversity (e.g. some tunable, some fixed)• Endpoint diversity (e.g. transponder ports may be fixed, tunable,
switchable, combo)
• Abstraction of node-scope optical constraints are necessary to support proper construction of virtual overlayer networks; some may be exposed as constraints to clients.• Key is to find the appropriate level of abstraction
© 2014 ADVA Optical Networking. All rights reserved. Confidential.1010
Optical Node ConfigurationNetwork
Degree 2
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
EX
TE
RN
AL
Tunable transponders
Network
Degree 1 Network
Degree 3
Colorless
ROADM
Directionless
ROADM
Directional
ROADM
Fixed FilterFixed Filter
XPD
R
XPD
R
PR
OT
External Wavelength
Transponder Protection
Fixed – Tunable Regeneration
Tunable – Tunable Regeneration
Fixed transponders
© 2014 ADVA Optical Networking. All rights reserved. Confidential.1111
Constraints in an Optical Node• Transponder tunable range constraint (TTR)
• Fixed transponder is a special case of TTR• To be exposed as tunability constraints to client layer for packet-
optical integration (where packet routers connects optically to the colorless ROADM of optical network)
• Lambda selection group (LSG)• Transponder tunable range constraint, network degree
• Edge binding constraint (EBC)• Array of { transponder ID, lambda selection group }• To be exposed as generic mutual exclusivity to client layer
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
EX
TE
RN
AL
Tunable transponders
Network
Degree 1 Network
Degree 3
Colorless
ROADM
Directionless
ROADM
Directional
ROADM
Fixed FilterFixed Filter
XPD
R
XPD
R
PR
OT
External Wavelength
Transponder Protection
Fixed – Tunable Regeneration
Tunable – Tunable Regeneration
Fixed transponders
Tunable Port ID 1 Grid ID 1 Lamba Offset 1
Tunable Port ID 2 Grid ID 2 Lamba Offset 2
XPDR
Network Degree 1
Network Degree 2
+
+
Transponder tunable range constraint
Virtual Link
Tunable Port ID 1 Grid ID 1 Lamba Offset 1 Network Degree 2+
Tunable Port ID 2 Grid ID 2 Lamba Offset 2 Network Degree 1+
… …
Lambda selection groupEdge binding
constraint
© 2014 ADVA Optical Networking. All rights reserved. Confidential.1212
Constraints in an Optical Node• Resource grouping constraints (RGC)
• Representation of shared resource exclusion between groups of transponders; may be identified by the ID of their connected multiplexers or ROADMs
• To be exposed to virtual networks as resource sharing constraints
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
EX
TE
RN
AL
Tunable transponders
Network
Degree 1 Network
Degree 3
Colorless
ROADM
Directionless
ROADM
Directional
ROADM
Fixed FilterFixed Filter
XPD
R
XPD
R
PR
OT
External Wavelength
Transponder Protection
Fixed – Tunable Regeneration
Tunable – Tunable Regeneration
Fixed transponders
Tunable Port ID 1 Grid ID 1 Lamba Offset 1
Tunable Port ID 2 Grid ID 2 Lamba Offset 2
Tunable Port ID 3 Grid ID 3 Lamba Offset 3
...
Resource Group ID
Virtual Link
Resource grouping constraint
© 2014 ADVA Optical Networking. All rights reserved. Confidential.1313
Constraints in an Optical Node• Transit binding constraint (TBC)
• Table of {incoming lambda channel, incoming network degree, outgoing lambda channel, outgoing network degree}
• Important for computing path for virtual overlay networks
• Regenerator binding constraints (RBC)• Array of { LSG of incoming regenerator port, incoming
network degree, LSG of outgoing regenerator port, outgoing network degree }
• Important for computing path for virtual overlay networks
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
XPD
R
EX
TE
RN
AL
Tunable transponders
Network
Degree 1 Network
Degree 3
Colorless
ROADM
Directionless
ROADM
Directional
ROADM
Fixed FilterFixed Filter
XPD
R
XPD
R
PR
OT
External Wavelength
Transponder Protection
Fixed – Tunable Regeneration
Tunable – Tunable Regeneration
Fixed transponders
Tunable Port ID 1
Grid ID 1
Lamba Offset 1
Network Degree 1
+
Transponder tunable range constraintLambda selection group
Tunable Port ID 2
Grid ID 2
Lamba Offset 2
Network Degree 2
+
…
Tunable Port ID 3
Grid ID 3
Lamba Offset 3
Network Degree 3
+
Tunable Port ID 4
Grid ID 4
Lamba Offset 4
Network Degree 4
+
© 2014 ADVA Optical Networking. All rights reserved. Confidential.1414
Summary• Optical networks can be virtualized for dynamic, multi-tenant operations
• Optical transport networks have complexities• A continuum of techniques needed to realize benefits
• Virtualization initially bring transport into SDN• Providers use virtual overlay networks to enable SDNs for clients• "Infrastructure-as-a-Service", "Just Enough Topology" models• Virtualization of optical networks build on top of established expertise
• Optical networks may be exposed as virtual overlay networks consisting virtual links, virtual nodes, or any combination of both to the clients
• Node scope virtualization requires proper abstractions and exposing of optical constraints
aguo@advaoptical.com
Thank You
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