Enhancing IP/Optical Convergence through SDN-enabled

Enhancing IP/Optical Convergence
through SDN-enabled Packet-aware
Transport
Chris Liou – VP Network Strategy
ECOC Market Focus 2015
1 | © 2015 Infinera Confidential & Proprietary
Agenda
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SP IP/Optical Convergence Challenges
Defining Packet-aware Transport
Enhancing IP/Optical Convergence
Role of SDN
Summary
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Service Provider Network Challenges
 Accommodating bandwidth growth
• Scalability + Survivability + Reachability + QoS
• 100G migration impact: Transport layer <-> IP layer
 ARPU & total network economics
• Optical transport infrastructure
• Packet service & networking
 Opportunity -> optimization of multi-layer networks
• PMO focuses on optimization within individual network layers
• Local optimization ≠ Global optimization
• Real opportunity lies in cross-layer optimization
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Basics of Optical Transport Switching Functions
Optical (Layer 0)
• Bulk capacity (superchannels, spectrum)
• Analog engineering,
impairment
awareness
• Dynamic restoration
capable
• Switching time: O(sec)
OTN (Layer 1)
• Sub-l grooming &
bandwidth delivery
• ODUflex granularity
• Deterministic digital
switching
• Shared mesh
protection capable
• Switching time O(ms)
Packet (Layer 2)
• Individual, finegranular packet flow
delivery
• Statistical multiplexing
gain
• Shared mesh
protection capable
• Switching time O(ms)
Optical systems offer multiple levels of convergence.
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Multiple Transport Architecture Options
 No switching
• Static, non-reconfigurable optical waves (FOADM)
 Single-layer switching options
• L0: ROADM (fixed & flexible grid spectral slices)
• L1: OTN fabric (variable-sized transparent circuits)
• L2: packet fabric
 Multi-layer/hierarchical switching options
• L1/L0
• L2/L1/L0
• L2/L0
How can multi-layer switching help IP/optical convergence?
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PMO: Transparent “Wavelength” Interconnect Model
L3/L2
100GE
ODU4
100G l
P2P
Transparent
Pipe
L3/L2
Conventional
Transport
(L1)/L0
(L1)/L0
• Rigid coupling of router port to wave
• Singular IP adjacency per interface
• Zero visibility to payload
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No Packet Awareness
PICs Enable
“convergence without
compromise”
Meshed router topology at port granularity
Router-based packet aggregation
Over-provisioned IP links for protection
Limited router offload / bypass
Packet-aware (L2/L1) Transport Approach
ODUflex
ODUflex
L3/L2
100GE
100GE
ODUflex
100G l
CoS 1
L2/L3
CoS 2
Packet
Aware
Transport
EIR
CoS n
ODUflex
L2/L1/L0
L2/L1/L0
• Transport layer visibility & processing of
packet flows
• Flows mapped to resizable circuits
• Per-ODUflex packet QoS control
7 | © 2015 Infinera Confidential & Proprietary
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PICs Enable
“convergence without
compromise”
IP Topo
decoupled from
physical ports
Enables inter-layer discovery
Enhances TE & router bypass (LSP/ODUflex)
Offloads packet aggregation & L2 svcs
Provides differentiated packet transport in L1
Packet Aware P-OTN w/ traffic mgmt
Packet-aware Transport Data Plane
Packet Switching & Processing
Switch
L1 Switching
OTN Fabric
Client Ports
Packet Processor /
Traffic Manager
ROADM
Layer
Adaptation
Router
10GbE or
100GbE
WDM Superchannel
WDM Superchannel
Multiple packet
flows with
different profiles
Packet Traffic delivered via
10G or 100G Ethernet
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Packet
Lookup &
QoS
Maps VLAN-ID or
MPLS PWE to
ODUflex or ODU2e
Packet traffic processed &
mapped into OTN circuit
Switching at
ODU0
granularity
Switched to
different
destinations
ODUflex or ODU2e maps
into optical network
Adaptation of Packet Services into ODU containers
Packet Switching &
Adaptation Domain
Trib
VLAN 1
L1 Switching
Domain
ODU2e
Frames with VLANs mapped to PWE which
are forwarded over a ODUflex/LSP tunnel
–OR—
forwarded directly as VLAN tagged frames.
Ethernet
PWE X
LSP
VLAN 3
PWE Y
LSP
Trib
Ethernet
Line/netwk
LSP
ODUflex
or
ODU2e
LSP
ODUflex
or ODU2e
Line/netwk
VLAN 2
Frames with MPLS-TP labels are switched
and forwarded over a ODUflex tunnel
Hitless resizing of ODUflex bandwidth
container enables dynamic adaptability
LSP
LSP
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Dynamically
Resizable
ODUflex
Native MPLS-TP facilitates packet switching
(LSR) at intermediate sites within transport
layer.
Enhancing Economics of Protection with
Transport Layer SMP
B
B
A
50G
G.808.3
G.ODUSMP
C
C
A
FRR/IGP
Reconvergence
A
C
Transport
Fast SMP
 <50ms G.SMP protection of packet-aware circuits can improve total network cost
• Reduces total network over-provisioning, particularly in IP layer
• Enables equipped router ports to be loaded at much higher utilization
 Up to 46% savings in router port BW at 8% increase in WDM port BW*
10 | © 2015 Infinera Confidential & Proprietary
*A Novel IPoOTN Packet-Optical Architecture for Economical and Fast Protection
of Link/IP Port Failures , S. Balasubramanian et alia, OFC 2015
Application: Native MEF/Carrier Ethernet/EoDWDM
Services
E-LAN
E-TREE
Objective: Use the
transport network to
deliver MEF services and
offload routers.
Packet-aware transport
systems can natively
supports E-LINE, E-LAN, ETREE & E-ACCESS services.
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Application: Ethernet Aggregation and Switching
Edge PoP with
multiple 10GE
ports
Edge PoP with
multiple 1GE
ports
Core PoP
Edge PoP
Objective: Efficiently
connect 1GE/10GE
at the edge to 100GE
at the core.
Nx10GE
100GE
Edge PoP
Nx10GE
PMO is to use core
routers or switches
to aggregate
Nx1GE/10GE traffic
to 100GE.
Core PoP
Edge PoP
100GE
Mx10GE
Nx1GE
Ethernet Agg
Aggregation/Backhaul
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Core PoP with
100GE ports
Application: Ethernet Aggregation and Switching
Edge PoP with
multiple 10GE
ports
Edge PoP with
multiple 1GE
ports
Core PoP
Edge PoP
Objective: Efficiently
connect 1GE/10GE
at the edge to 100GE
at the core.
Nx10GE
100GE
Edge PoP
Nx10GE
PMO is to use core
routers or switches
to aggregate
Nx1GE/10GE traffic
to 100GE.
Core PoP
Edge PoP
100GE
Mx10GE
Nx1GE
Ethernet Agg
Aggregation/Backhaul
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Core PoP with
100GE ports
Packet-aware
transport offloads
aggregation to
optical layer.
Application: Router Bypass
Objective: Add edgeto-edge capacity at a
lower cost-point.
PMO is to route all
edge-to-edge traffic
through the routers.
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Application: Router Bypass
Objective: Add edgeto-edge capacity at a
lower cost-point.
CapEx saved by not
requiring additional
core router ports
PMO is to route all
edge-to-edge traffic
through the routers.
Incremental pointto-point capacity
bypasses core
routers.
VLAN-based bypass
connections
Packet-aggregation,
adaptation &
switching
15 | © 2015 Infinera Confidential & Proprietary
Packet-awareness
integrates L2 switching
& aggregation along
with optical transport.
Deploying L2 switching
lowers layer-3 network
costs.
Application: Router Interconnect via EP-LAN
Objective: Mesh group of
routers cost-effectively.
PMO is to interconnect
routers w/ wavelengths.
Fiber infrastructure may
require all links run at
same rate.
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Application: Router Interconnect via EP-LAN
CapEx saved by directly
interconnecting routers via
EP-LAN, eliminating mesh of
wavelengths.
Objective: Mesh group of
routers cost-effectively.
EP-LAN
PMO is to interconnect
routers w/ wavelengths.
Fiber infrastructure may
require all links run at
same rate.
Packet switching
supporting multipoint
ELAN services.
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Transport layer EP-LAN
offers simple way to
mesh routers w/ rightsized ports.
Application: Transport-level Policy Based Forwarding
Differentiated Transport QoS
L3 Adjacency
L2/L1/L0 Transport (EVPL, EP-LAN)
EVPL A-B
High latency, CoS 2, 0+1
Low latency, CoS 1, Fast SMP
A
EVPL A-C
Packet-aware
Optical
Transport
B
C
Objective: provide differentiated transport for packet flows between routers (eg, latency)
Solution: Form L3-adjacency between Router A to Router B & C over single router interface
Traffic-engineer flows via EVPL services at transport layer
• Simplifies & scales traffic engineering across backbone
• Provides ACLs for more flexible classification into ODUflex containers (QoS fields)
• Transport-differentiated packet flows through optical backbone (path, resiliency, stat mux gain,…)
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Role of Multi-layer SDN
Intelligent Multi-Layer Resource Allocation
Multi-Layer Visibility,
Orchestration & Control
Important SDN Control Elements
•
•
•
•
Multi-layer topology & dependencies
Multi-layer, multi-constraint PCE
Policy management (inter- & intra-layer)
Automation & layer orchestration
19 | © 2015 Infinera Confidential & Proprietary
Summary
 Packet-aware optical transport enhances IP/Optical
• Decouples IP topology from transport topology
• Increases transport bandwidth efficiency
 Increases router port efficiency & utilization
• Decouples fiber scale from router interface scale
• Enables multiple express links w/ differentiated QoS per router port
• Provides L2-centric alternatives for meshing routers (eg, EP-LAN)
 Simplifies operations & traffic engineering
• L2-over-L1 adds transport-level policy based forwarding options
• L1-centric shared mesh protection alternative to FRR
• SDN for centralized orchestration, automation & optimization
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Thank You
[email protected]
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22 | © 2015 Infinera Confidential & Proprietary