GMPLS — The Unified Control Plane For
Multi-layer Optical Transport Networks
9. ITG Fachtagung des ITG-FA 5.2: Zukunft der Netze
Selbstorganisation — Chance und Herausforderung
Dieter Beller
07-Oct-2010
Agenda
1. The GMPLS control plane — a brief introduction
2. OTN introduction and overview
3. Multi-layer aspects
4. Multi-layer use case
5. Services on demand via UNI5. Services on demand via UNI
GMPLS control plane – the enabler for intelligent networking
Key Control Plane Functions:
� Automation:
� Auto-discovery of network resources
� Network topology/utilization awareness
� Fast service provisioning (incl. protection)
� Priority based restoration
� Coordination in multi-layers networks
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� Coordination in multi-layers networks
� Resource selection (diversity, etc.)
� Resilience (protection/restoration)
What is GMPLS ?
� GMPLS is the control plane protocol suite
and the key enabler for intelligent
networking across multiple network layers
and multiple transport technologies.
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GMPLS — the unified control plane for multi-layer optical transport networks
What are the involved functional network components?
Converged service-awarenetwork management
Multi-layer capable
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Multi-layer capableGMPLS control plane
Different types of NEs constituting the ML data plane
CP CP
GMPLS — the unified control plane for multi-layer optical transport networks
Distributed GMPLS control plane architecture
Corerouters
� GMPLS control plane (CP) instance running on each network element
� GMPLS CP instances are communicating with each other
� Each CP instance has a full topological/resource view of the entire domain
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Converged backbone
Converged edge
OTN/photonic switches
Servicerouters
Servicerouters
Converged service-awarenetwork management
Management plane integration
GMPLS — the unified control plane for multi-layer optical transport networks
GMPLS control plane functional components
Signaling
Mgmt. I/F
Routing &Path Comp.
� Signaling:
� RSVP-TE signaling protocol
� Connection handling:
– Create/delete/modify
– Support of 1+1 protection scheme
– Restoration & reversion (nominal path)
� Routing and Path Computation
OSPF-TE routing protocolLink Mgmt.
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Ctrl. I/F� OSPF-TE routing protocol
� Support of various TE-link attributes
� Constraint-based path computation
� Enhancements for photonic WDM layer
� Link management:
� LMP protocol
� Auto-discovery of network resources
� Management of link resources
Link Mgmt.
OTN overview:
OTN multiplexing hierarchy — electrical domain (ITU-T G.709)
ODU01GbE
ODU1x2
x8
ODU1
ODU2
OTU1
OTU2
CBR2G5
CBR10G
ODU2x4
10GbE LAN
ODUflex
CBRx2G5+
GFP data
xn
ODU clients LO ODU HO ODU/OTU Foundation G.709 Hierarchy
G.709 Amendment 3
Non-normative (G.sup43)
2009 standards agreements
OTU3e1ODU3e1x4
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ODU2e
ODU4 OTU4
40GbE
100GbE
10GbE LAN
ODU4
x3
ODU3OTU3CBR40G
x4
x16 ODU3
10GbE LAN
x32
x40x80
x10x10x2
OTU2e
OTU3e2ODU3e2
xn
xn
AMP—Asynchronous mapping procedure
BMP—Bit-synchronous mapping procedure
CBR—Constant bit rate
GbE—Gigabit Ethernet
GFP—Generic framing procedure
GMP—Generic mapping procedure
HO—Higher order
LAN—Local area network
AMP/BMP
GMP
x4
LO—Lower order
ODU—Optical channel data unit
OTN—Optical transport network
OTU—Optical channel transport unit
OTN overview:
Structure of the Optical Transport Module (OTM)
OTUk
Client
ODUk FECOH
OPUkOH
ClientOH
Dig
ital d
omai
n
Ass
ocia
ted
over
head
OH
asso
ciat
ed o
verh
ead
FEC—Forward error correctionOCC—Optical channel carrierOCh—Optical channelODU—OCh data unitOH—OverheadOMS—Optical multiplex sectionOOS—OTM overhead signalOPS—Optical physical sectionOPSMnk – Optical physical section-multilaneOPU—OCh payload unitOSC—Optical supervisory channel
OTM—Optical transport module
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Optical transport module
OTUk
OCC OCC OCC
OOS
OSC
OH
OH
OH
Non
-ass
ocia
ted
ove
rhea
d
OPS0
OTN—Optical transport networkOTS—Optical transmission section OTU—OCh transport unit
OPSMnk
Multi-layer GMPLS control plane aspects of the OTN
� Layer coupling:
� Today: OCh/OMS and ODU layers are totally decoupled � full separation
� Increasing layer coupling from loose to tight coupling over time:
– Loose layer coupling: hard FAs (pre-established server layer trails)
– Medium layer coupling: soft FAs (pre-configured server layer trailsforming a virtual server layer topology allowing to re-use expensive
Evolutio
n
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forming a virtual server layer topology allowing to re-use expensiveserver layer resources (e.g. transponders) in the event of failures)
– Tight layer coupling: full server layer visibility, policy rules at layer boundaries
� Characteristics of the OTN switching technologies:
� Electrical ODU switching technology � fast switching layer � fast restoration (100ms)
� Photonic switching technology � slow switching layer � slow restoration (>10s)
Multi–layer network architecture: a server layer trail constitutes a tunnel or
forwarding adjacency (FA) in the client layer with inherited Shared Risk Groups
Tunnel (FA)
Client layer
SRG=
{a,b}
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Server layer
Dual layer Dual layer NE
SRG = {a}SRG = {b}
Use case for multi-layer unified control plane with layer interactions:
resuming diversity constraint of 1+1 protected connection in the client layer
ODU layer
SRG=
{a,b}
SRG=
{c,d}
SRG=
{a,c}
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OCC/OMS layer
Source Dest.
Interworking of IP/MPLS client network with OTN based on UNI
Ethernet EPL/EVPL service on demand
Router
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OCC/OMS layer
UNI UNI
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Overlay network architecture & switched connection (SC) services
MPLS MPLS
UNI-NGMPLSUNI-C
GMPLSUNI-C UNI-N
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A D
UNI UNINNIBorderNode
B C
RSVP signaling sessions in a multi-layer environment
RSVP-TE GMPLS
RSVP-TE GMPLS
IP/MPLS Control Plane adjacency
ODU Path
Eth-SCRSVP-TE GMPLS
RSVP-TE MPLSMPLS
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A D
MPLS MPLS
UNI UNINNIBorderBorderNode
B C
UNI-N UNI-CUNI-C UNI-N
14 | Unified GMPLS Multi-Layer Control Plane | October 2010
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Thank You!
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