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 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 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. 3 Unified GMPLS Multi-Layer Control Plane October 2010
GMPLS the unified control plane for multi-layer optical transport networks What are the involved functional network components? Converged service-aware network management CP CP Multi-layer capable GMPLS control plane Different types of NEs constituting the ML data plane 4 Unified GMPLS Multi-Layer Control Plane October 2010
GMPLS the unified control plane for multi-layer optical transport networks Distributed GMPLS control plane architecture 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 Core routers Service routers OTN/photonic switches Service routers Converged edge Converged backbone Converged service-aware network management Management plane integration 5 Unified GMPLS Multi-Layer Control Plane October 2010
GMPLS the unified control plane for multi-layer optical transport networks GMPLS control plane functional components 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 protocol Support of various TE-link attributes Mgmt. I/F Signaling Routing & Path Comp. Link Mgmt. Ctrl. I/F Constraint-based path computation Enhancements for photonic WDM layer Link management: LMP protocol Auto-discovery of network resources Management of link resources 6 Unified GMPLS Multi-Layer Control Plane October 2010
OTN overview: OTN multiplexing hierarchy electrical domain (ITU-T G.709) ODU clients LO ODU HO ODU/OTU Foundation G.709 Hierarchy 1GbE ODU0 G.709 Amendment 3 CBR2G5 ODU1 2009 standards agreements CBRx 2G5+ GFP data CBR10G 10GbE LAN ODUflex ODU2 x2 x8 x4 xn ODU1 ODU2 OTU1 OTU2 x4 Non-normative (G.sup43) ODU3e1 OTU3e1 OTU2e 10GbE LAN CBR40G 40GbE ODU2e ODU3 x32 x16 x3 x4 xn ODU3 OTU3 x4 ODU3e2 OTU3e2 100GbE ODU4 x80 x40 x10 x10 x2 xn ODU4 OTU4 AMP/BMP GMP 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 LO Lower order ODU Optical channel data unit OTN Optical transport network OTU Optical channel transport unit 7 Unified GMPLS Multi-Layer Control Plane October 2010
OTN overview: Structure of the Optical Transport Module (OTM) Client Digital domain Non-associated overhead Associated overhead OH OH OH OOS OSC OH OH Client OH OPUk ODUk OTUk OCC OCC OCC Optical transport module FEC OPS0 OPSMnk FEC Forward error correction OCC Optical channel carrier OCh Optical channel ODU OCh data unit OH Overhead OMS Optical multiplex section OOS OTM overhead signal OPS Optical physical section OPSMnk Optical physical section -multilane OPU OCh payload unit OSC Optical supervisory channel OTM Optical transport module OTN Optical transport network OTS Optical transmission section OTU OCh transport unit 8 Unified GMPLS Multi-Layer Control Plane October 2010
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: Evolution Loose layer coupling: hard FAs (pre-established server layer trails) Medium layer coupling: soft FAs (pre-configured server layer trails forming a virtual server layer topology allowing to re-use expensive server 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) 9 Unified GMPLS Multi-Layer Control Plane October 2010
Multi layer network architecture: a server layer trail constitutes a tunnel or forwarding adjacency (FA) in the client layer with inherited Shared Risk Groups Client layer SRG= {a,b} Tunnel (FA) Dual layer NE Server layer SRG = {a} SRG = {b} 10 Unified GMPLS Multi-Layer Control Plane October 2010
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} {a,c} SRG= {c,d} Source Dest. OCC/OMS layer 11 Unified GMPLS Multi-Layer Control Plane October 2010
Interworking of IP/MPLS client network with OTN based on UNI Ethernet EPL/EVPL service on demand Router UNI UNI OCC/OMS layer 12 Unified GMPLS Multi-Layer Control Plane October 2010
Overlay network architecture & switched connection (SC) services MPLS MPLS GMPLS UNI-C UNI-N B A UNI 13 UNI* Strategy March 2010 GMPLS UNI-C UNI-N C NNI Border Node D UNI
RSVP signaling sessions in a multi-layer environment RSVP-TE MPLS MPLS Eth-SC IP/MPLS Control Plane adjacency RSVP-TE GMPLS ODU Path RSVP-TE GMPLS RSVP-TE GMPLS MPLS MPLS UNI-C UNI-N B A UNI 14 Unified GMPLS Multi-Layer Control Plane October 2010 UNI-C UNI-N C NNI Border Node D UNI
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