adva multi-layer control plane technologies for hybrid networks
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Wes DoonanOFC/NFOEC
March 2012
Multi-Layer Control PlaneTechnologies for Hybrid Networks
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Packet + Optical Networks
Integrates multiple networking technologies
Packet Service Layer
IP Routers, MPLS LSRs
Provides various IP/MPLS services directly to clients
Provides IP/MPLS infrastructure to Cloud/CDN applications
Packet technology, Packet focus, Packet operational practice
Optical Transport Layer
WDM transport elements, ROADMs, regenerators, amplifiers
Provides point-to-point wavelength services to Packet layer
Enables optical bypass at router sites where needed
Optical technology, Optical focus, Optical operational practice
P-PCE
LAX
ORD
ATL
PHX DFW
DIA
O-PCE
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Layering Concept
Server layer network
Client layer network
= serverconnections
= link
= elementConnections in Server layer networkcreate Links in Client layer network
= client connection
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Virtual Network Topologies
Abstract representation of a real network Built from virtual components virtual links, virtual nodes
Purpose: Abstraction Represent multiple real components as a single virtual component
Example: represent domain A as single virtual node in domain B
Purpose: Adaptation
Represent server layer network capabilities in client layer network Example: expose a lambda connection as a link in a packet topology
Purpose: Activation Coordination activation of capabilities across layers, domains
Example: server layer connection activated during client layer signaling
Virtual Topologies are planned
VNTs created during application planning process Prior to service provisioning, ongoing over lifetime of network
Represent "potentialities" of the real network E.g. what real connectivity "can" be, when requested
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Virtual Topology Concept
Server layer network
Client layer network
= serverconnections
= virtual link
Connections in Client network triggerConnection setup Server network
Planning
= link
= element
= client connection
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Workflow
1. Plan Connectivity
Real
or Virtual?
2a. Provision Real Link
2b. Provision Virtual Link
3. Provision Packet LSP
4. Provision MPLS LSPs
Enough
Topology?
Enough
Topology?PCE
Y
N
N
Y
R
V
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Packet TEDB
Links Creation
Purpose: Identify potential or dedicated connectivity
Optical domain to provide connectivity across domain
Dedicated: DFW->ORD
Potential: 2 x LAX->DFW, LAX->ORD
Dedicated connectivity provided by real links
Connections provisioned in optical domain, resources activated, etc
Potential connectivity provided by virtual links
Links advertised to packet domain, paths computed in optical domain
Optical domain resources not activated until client link is used
LAX
ORD
ATL
PHXDFW
DIA
= Packet = Optical
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Packet TEDB
Provision Packet LSPs
LAX
ORD
ATL
PHXDFW
DIA
P-PCE
Purpose: Interconnect Routers
Router requested to provision connections across Packet domain
Example: DFW->ORD, DFW->LAX
Normal LSP provisioning operations within Packet domain
P-PCE used to determine/qualify most optimal paths
Considers access links (P-O) and network links (O-O)
Uses traffic engineering data on links provided by Optical domain
P-PCE computes optimal connectivity for client applications
When complete, Router advertises links to client MPLS network
= Packet = Optical
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Packet TEDB
Virtual Link Options
LAX
ORD
ATL
PHXDFW
DIA
P-PCE
Purpose: Utilize other potentialities of the network
Optical characteristics change
LAX->PHX->DFW becomes optically worse than LAX->DIA->DFW
LAX->DIA->DFW computable due to virtual link
Paths can be re-routed as desired
Client requirements change (e.g. want LAX->ORD now)
LAX->ORD computable due to virtual link
LAX->DFW re-routable to LAX->ORD as desired
= Packet = Optical
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Packet TEDB
GMPLS Overlay
LAX
ORD
ATL
PHXDFW
DIA
= Packet = Optical
Mechanism for building multi-technology overlay networks
Uses existing technologies as building blocks
Multi-Layer operation
Virtual Links, Virtual Nodes, Virtual Topologies
PCEs paired with domains and/or layers
Identify domain and/or layer boundaries
Allows definition of policies at domain/layer boundaries
What path should a connection take in a server network?
How should clients be notified of server network activation?
Etc ...
UNI
UNI
UNI
UNI UNI
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GMPLS Overlay
GMPLS User to Network Interface Interoperable service activation across layers and domains
Origin: RFC4208 Defines the overlay network model, concepts
Outlines multiple scenarios, options, mechanisms
Initially issued in 2005, considerable experience since then
Update: draft-beeram-ccamp-gmpls-uni-bcp Presents "best current practice" profile of RFC4208
Derived from specific experiences, lessons learned Multi-layer activation, use of virtual topologies
Label signaling across technologies
Coordinating administrative status
Routing updates to support virtual nodes
Handling of generic constraints
Codify real-world operational practices, experiences
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Fate Sharing
Virtual Links must reflect diversity of server network Server network connections may share fate
Multiple wavelengths which share the same fiber
Path computations in client network may require diversity Virtual links must expose fate sharing of server network connections
Shared Risk Link Groups (SRLGs) Integer annotations to TE links, identifying fate-sharing groups
SRLGs are per-layer/domain, must be coordinated somehow Different approaches
Server layer SRLG accumulation, macro SRLGs, etc
SRLG =
SRLG =
SRLG =
SharingServer Layer Client Layer
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Constrained Switching Support
Switching constraints at UNI boundaries Some networks impose switching constraints at nodes
Example: Optical element with fixed-fiber add/drop site (FOADM)
Server network connection may include constrained hardware
Client network will need to know if switching constraints exist
draft-ietf-ccamp-general-constraint-encode Outlines mechanism for advertising constraints between links
Informs PCEs which links can be cross-connected at a node Client network PCEs take as input to constraint calculations
Generalized, not specific to particular transport technology
Not always required, depends on layer networks
B
D
C
A
{ A x B; A ! C; A x D }
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Summary
LAX
ORD
ATL
PHXDFW
DIAUNI
UNI
UNI
UNI UNI
Multi-layer, multi-domain networks are a Reality
Packet + Optical, other network technology mixes
Multi-layer control mechanisms are also real
Architectures defined, standards in place
Virtual Network Topologies enable inter-layer coordination
Existing methods and abstractions, extended across layers
Overlay networking manages client/server network interactions
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Thank you
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