Transcript Hybric Packt Transport Networks

Packet Centric Transport in
NG Hybrid TDM/Packet/WDM
Transport Networks
Enrique Hernandez-Valencia
Alcatel-Lucent Optics CTO Group
Internet 2 - Summer 2007 Joint Techs Workshop
Fermilab - Batavia, IL
July 15-18, 2007.
Agenda
1. Transport Network Evolution Drivers
2. NG Hybrid Transport Node Models
3. Packet Transport Framework
4. Closing Remarks
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Transport Network Evolution Drivers
In an All-IP, blended
services world, traffic must
be aggregated and
transported over distance
with high resiliency at the
lowest cost per bit
Application service layer convergence on IP
Transport service layer moving to Packets
Service Drivers
Internet Access
Switched Ethernet
Bus/Res 3-Play
Switched Ethernet
Fix/Mobile
Convergence
Bus/Res 3-Play
Switched Ethernet
Transport Network Investments (Aggregation)
Core
Metro
Hybrid Packet Transport
SDH/SONET
SDH/SONET
SDH/SONET
EoS
EoS
EoS
Access
Enterprise
Ethernet
2000
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2003
SDH/SONET
ROADM
Carrier
Ethernet
(e.g.
MPLS)
2006
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T-ROADM
NG
Packet
Transport
2009
Transport Network Equipment – Requirements & Enablers
Transport Network
Reliable aggregation and transport of any client
traffic type, in any scale, at the lowest cost per bit
Scalability
Multi-service
Quality
Cost-Efficiency
Ability to support
any number of client
traffic instances
whatever network
size, from access to
core
Ability to deliver any
type of client traffic
(transparency to
service)
Ability to ensure
that client traffic is
reliably delivered at
monitored e2e
performance
Acting as server
layer for all the rest
by keeping
processing
complexity low and
operations easy
 Connection oriented
 OAM, resiliency
 Traffic engineering,
resource reservation
 CAPEX: low protocol
complexity
 OPEX: multilayer
operations across
Packets/TDM/λ
 Networking Layering
 Domain Partitioning
 Client agnosticism
(any L1, L2, L3)
Transport values have evolved through long TDM evolution
They hold through transition to packets
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Hybrid Architecture for Next-Generation Transport
Client Processing decoupled from Switching
Universal Switching
 Integrated TDM/Packet switching architecture
 Switching synch traffic (circuits) or asynch traffic
(packets) in native format (technology-independent)
 Non-stop forwarding (not affected by traffic
congestion)
Specific Traffic Processing Line Cards
 Technology-dependent traffic line cards
 Host tech specific traffic processing functions
(classification, policing, perf. monitoring, OAM, etc)
 Open to any packet-based transport protocol, focused
around carrier grade layer 2 transport such as Ethernet
Provider Bridging & T-MPLS
Photonics Integration
 CWDM/DWDM, OADM, Mux/Demux, Transponders
 ROADM, OTH
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Photonic
Universal
TDM/Packet
Switch
Seamless Network Transformation to All-Packet Transport
Universal
Switch
Carrier Ethernet
transport model
MSPP model
SONET/SDH model
Native switching
of synch traffic
(circuits) and
asynch traffic
(packets)
Universal
Switch
Universal
Switch
C/D-WDM
ROADM
STM-1
OC-3
E1/DS1
OC-192
STM-64
TDM card
100% Circuit
OC-192
STM-64
10GE
Photonic card
GE/FE
Packet card
Any Traffic Mix
 Freedom in planning network resources, reduced investment risk
 Cost-optimized network consolidation
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GE FE
10GE
10GE
100% Packet
C/D-WDM
ROADM
Hybrid-Fabric Approaches
Dual Packet-TDM Fabric
Attributes:
 Dual TDM/Packet Star
 Separate TDM/Packet backplane
traces
TDM Card
XSFP
Drawbacks:
 Duplicated modules (cost & footprint)
 Duplicated backplane traces (CAPEX)
 Independent subsystem technologies
to be managed (OPEX)
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XSFP
XSFP
NPU
& TM
XSFP
XSFP
Packet Card
Packet
BP Int.
NPU
& TM
 Leverage OTS components
Mapper/
Framer
Packet Card
Packet
BP Int.
 Native TDM (e.g. crossbar) and Packet
(e.g., self-routed) fabrics support &
feature set
TDM
BP Int.
XSFP
TDM
BP Int.
Advantages:
Mapper/
Framer
XSFP
TDM Card
XSFP
Hybrid-Fabric Approaches
Central Packet Fabric
Attributes:
 Single packet fabric instance
 Single-set of backplane traces
 TDM emulation toward fabric
 Higher TDM card cost from CE
functions
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XSFP
XSFP
NPU
& TM
 Stringent packet/cell processing
constraints to support TDM traffic
emulation requirements
Mapper/
Framer
Drawbacks:
XSFP
Packet Card
Packet
BP Int.
XSFP
Packet
BP Int.
XSFP
TDM Card
CES
BP Int.
Packet Card
NPU
& TM
 Single (packet-oriented) control
framework
XSFP
CES
BP Int.
 Leverage OTS packet processing
components
XSFP
Mapper/
Framer
Advantages:
TDM Card
XSFP
Hybrid-Fabric Approaches
Central TDM Fabric
Attributes:
 Single TDM fabric instance
 Single-set of backplane traces
 Arbitrated TDM fabric access
TDM Card
XSFP
 More complex fabric access arbitration
for packet cards
 Fabric scaling to higher data rates?
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XSFP
XSFP
NPU
& TM
Drawbacks:
XSFP
Packet Card
Packet
BP Int.
NPU
& TM
XSFP
Packet
BP Int.
 Single TDM-oriented control
framework
Packet Card
Mapper/
Framer
 Native synchronous fabric (low cost)
TDM
BP Int.
XSFP
TDM
BP Int.
Advantages:
Mapper/
Framer
XSFP
TDM Card
XSFP
Hybrid-Fabric Approaches
Tradeoffs
Key hybrid-fabric tradeoffs:
 Parallel Packet-based and TDM-based solution achieve high functionality with low
component integration (multiple devices) and, hence, higher cost
 Packet-based solutions require TDM-to-packet conversion on I/O Ports – High Cost –
and greater performance budget (jitter and delay sensitivity) w.r.t TDM service
 TDM-based solution delivers compatible with TDM performances w/o penalties on
costs & provide option for interoperation with TDM only I/O
Extra Cost on
Data boards,
Full or partial
board capacity
TDM
TDM
Packet
Packet
A Multi-Service TDM fabric allows flexible and cost-effective cross-connection of
SONET and G.709 OTN) containers and..... Packet Switching!
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I/O & Agnostic TDM Fabric Connectivity: A typical Implementation
 Connection between TDM/WDM Line Card
Input/Output ports are Static
 There is a static 1-to-1 relationship between
input port signal and output port signal
SIO(t) =
1,
0,
if I=X and O=Y  t
otherwise
 Connection between Packet Line Cards are
Dynamic to allow packet aggregation
I1
Universal
Switch
TDM/WDM
Line Card
TDM/WDM
Line Card
Packet
Line Card
Packet
Line Card
Packet
Line Card
 There is a dynamic N-to-1 relationship
between input port signal and output port
signal (e.g., re-arrangeable CLOS)
SIO(t) =
1,
if I=X and O=R(t)
0,
otherwise
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O1
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IN
ON
SXY SUV
Fabric Access
controller
Packet Transport Aggregation Framework
Based on a connection-oriented packet switching (CO-PS) model
 Intended as a carrier grade all-packet transport technology
 Packet-oriented forwarding
 Complemented with comprehensive OAM and resiliency capabilities
 Profiled after the L2 aspects of IETF MPLS technology
 Synergy with IETF IP/MPLS-based service networks and models (inc. multipoint emulation via
VPLS/H-VPLS)
 Simpler in forwarding scope, less complex in operations (no native IP forwarding)
 Can operate independently of their clients (e.g., Ethernet, IP/MPLS, etc.) and
associated control networks (management and signaling)
 Being specified under ITU-S Study Group 15 (Rec. G.8110.1) & IETF PWE3 (as
“MPLS Transport”)
Others
IP/MPLS
T-MPLS
Link/Section
T-MPLS
Path/
T-MPLS
Channel
(PWE3 based)
Ethernet
Optical-Packet Transport Network
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Control Plane Directions: ASON/GMPLS
 GMPLS proposed as the single generalized distributed control plane to be
used form common control protocol for multiple networking technologies
environment, including Packets, TDM/Optical and/or Photonics
 GMPLS already define support for:
 UNI, I-NNI and E-NNI interfaces (thus easing overlay dynamic approach)
 Bidirectional & Unidirectional paths
 GMPLS also allows for separation of data plane and control plane
 Only control interfaces are used to flood control information
 GMPLS allows for “horizontal” scalability in routing domains (thanks to
separation of data plane and control plane and recursive topology)
 GMPLS allows for “vertical” scalability (same control plane across photonic,
TDM and packet layers)
GMPLS is the ideal control plane for multilayered networks
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Hybrid Transport-Switch implementation
Transport instance target vision
Typical Core
node
implementation
General Transport
Switch architecture
Typical WDM node
implementation
Typical metro
node
implementation
CBR
(2,5Gb/s)
CBR
(<2,5Gb/s)
CBR - ODU
CBR – SDH
L2/L3 -Packet
ODU switch
SDH switch
MPLS switch
CBR - ODU
ODU - ODU
SDH - ODU
TMPLS - ODU
ODU - lambda
ODU - lambda
ODU - lambda
ODU - lambda
Lambda
(ALU colored)CBR
Och Switch
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Packets
Line
An Scalable Hybrid Transport Architecture
Transport Service Switch
Carrier Ethernet/MPLS Transport
Generalized MPLS Control Plane (G-MPLS)
Optical Transport Hierarchy (G.709)
SDH/SONET
TDM
WDM
STM-n/OC-x
Servers
Service
VC/VT Clients
TDM
Och
ODU
T-MPLS
WDM
Servers
OAM
Circuit Transport
Ethernet
Clients
Service
OAM
Packet / Photonic Transport
Purposely designed for carrier-grade Packet Transport Networking





Synthesis of best-in-class packet (IETF) and transport (ITU) features
MPLS profiled, but transport-oriented (wrt. OAM/Resiliency/PM)
Client-independent, medium-independent (Multi-service)
Scalable forwarding, control/management planes (via ASON/GMPLS)
Cost-effective (simple forwarding & comprehensive operations capabilities)
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