GMPLS —The Unified Control Plane For Multi-layer Optical ......GMPLS —The Unified Control Plane For Multi-layer Optical Transport Networks 9. ITG Fachtagung des ITG-FA 5.2: Zukunft

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

Copyright © 2010 Alcatel-Lucent. All rights reserved.

� 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-awarenetwork management

Multi-layer capable

Copyright © 2010 Alcatel-Lucent. All rights reserved.4 | Unified GMPLS Multi-Layer Control Plane | October 2010

Multi-layer capableGMPLS control plane

Different types of NEs constituting the ML data plane

CP CP


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


Converged backbone

Converged edge

OTN/photonic switches

Servicerouters

Servicerouters

Converged service-awarenetwork management

Management plane integration


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.


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


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


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


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}


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}


OCC/OMS layer

Source Dest.

Interworking of IP/MPLS client network with OTN based on UNI

Ethernet EPL/EVPL service on demand

Router


OCC/OMS layer

UNI UNI


Overlay network architecture & switched connection (SC) services

MPLS MPLS

UNI-NGMPLSUNI-C

GMPLSUNI-C UNI-N

Copyright © 2010 Alcatel-Lucent. All rights reserved.13 | UNI* Strategy | March 2010

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


A D

MPLS MPLS

UNI UNINNIBorderBorderNode

B C

UNI-N UNI-CUNI-C UNI-N


www.alcatel-lucent.comwww.alcatel-lucent.com

Thank You!

Copyright © 2010 Alcatel-Lucent. All rights reserved.15 | Presentation Title | Month Year

www.alcatel-lucent.com

Documents

GMPLS —The Unified Control Plane For Multi-layer Optical ......GMPLS —The Unified Control Plane For Multi-layer Optical Transport Networks 9. ITG Fachtagung des ITG-FA 5.2: Zukunft