PowerPoint Presentation

TM8106Optical NetworkingMulti-Protocol Label Switching-Transport Profile(MPLS-TP)

ByAmeen ChilwanSyllabus:

[1] MPLS Transport Profile (MPLS-TP): A Set of Enhancements to the Rich MPLS Toolkit, Juniper Networks, Whitepaper, 2011.

[2] Dieter Beller, Rolf Sperber, MPLS-TP The New Technology for Packet Transport Networks, 2nd DFN Forum, 2009. #1OutlineTransport NetworksMPLS-TP BasicsStandardization HistoryMPLS-TP ComponentsOAMControl PlaneResiliencySynchronizationPhysical Infrastructure SupportDeployment OptionsMisconceptions about MPLS-TPConclusion

27.09.2012TM8106 Optical Networking - MPLS-TP#Transport NetworksGoal of transport network

Requirements

27.09.2012TM8106 Optical Networking - MPLS-TP

#Packet-based Transport NetworkMPLS has been serving as one for almost a decadeConnection-oriented and Packet-basedDesigned to carry L3 IP TrafficEstablishes IP traffic pathsAssociates these paths with arbitrarily assigned labelsGMPLS extends MPLSLabel switching forTDM (SONET/SDH)Wavelength ()Spatial switching (incoming ports to outgoing ports)

27.09.2012TM8106 Optical Networking - MPLS-TP#MPLS-TP EmergenceLacks some features of SDH-like networksOperation, Admin and Management (OAM)ResiliencyScalable operationsHigh availabilityPerformance monitoringMulti-domain supportIETF and ITU-T joined forces to enhance MPLSMPLS-TP27.09.2012TM8106 Optical Networking - MPLS-TP#MPLS-TP BackgroundDrivers for MPLS-TPRise in demand for service sophisticationBandwidth-hungry servicesPressure to reduce operational cost (OPEX)Maximize the value per bitLead to a technology that is almost SDH-likeCarrier-gradePacket-switchedWith OAM features27.09.2012TM8106 Optical Networking - MPLS-TP#MPLS-TP OverviewTakes a subset of MPLS/GMPLSEnhance with some functionalitiesNetwork Management (e.g. FCAPS)Dynamic provisioning of transport paths via control planeProvide restoration functionsE2E path provisioning across networks/domainsCharacteristicsConnection orientedClient and physical layer agnosticOAM similar to SDH-like networksProtection schemesNetwork provisioning via centralized NMSGMPLS Control plane applicable

27.09.2012TM8106 Optical Networking - MPLS-TP#Standardization HistoryITU-T will define requirementsIETF will work on protocol extensions

27.09.2012TM8106 Optical Networking - MPLS-TP

#MPLS-TP Components27.09.2012TM8106 Optical Networking - MPLS-TP

#Operation, Admin and ManagementDedicated OAM packet interspersed into the associated user traffic flowsCreated and processed by maintenance end-pointsIntermediate points can also process them & collect dataOAM Tools

27.09.2012TM8106 Optical Networking - MPLS-TP

#OAM Functions and ToolsFunctionsFault Detection (e.g. connectivity check)Fault Localization (e.g. loopback, lock)Performance Monitoring (e.g. delay, loss)Tools (Existing MPLS tools extended)Bidirectional Forwarding Detection (BFD)LSP PingLSP Trace

27.09.2012TM8106 Optical Networking - MPLS-TP#OAM Enhancements27.09.2012TM8106 Optical Networking - MPLS-TP

#Associated Channel (ACh)MPLS-TP shall work without IP functionalityMPLS uses Ach for framing, forwarding and encapsulationEnhanced by GACh and GACh Label (GAL)Support in-band control channelsGAChEnsure congruency between OAM packets and data pathIndicates tagged packet must be processed by special functionNot suitable for static provisioningBecause negotiated when pseudowire was setupSolved using GAL (reserved value of 13)Enables easy extraction at end- and mid-point nodes

27.09.2012TM8106 Optical Networking - MPLS-TP

#Control Plane (Static and Dynamic)Responsible for setup of LSPMPLS has mature and dynamic control planeOSPF-TE, IS-IS-TE, RSVP-TE and BGPCurrent transport networks have static control planeusing NMSMPLS-TPCan have both static or dynamicDynamic has advantages like:ScalingAdvanced protection functions (e.g. LSP tail-end protection)RestorationDistributed control planeSignaling, routing and TEDecoupled from data plane

27.09.2012TM8106 Optical Networking - MPLS-TP#MPLS-TP Control Plane (contd)27.09.2012TM8106 Optical Networking - MPLS-TP

#ResiliencyMechanisms in MPLSLSP fast reroutePseudowire redundancyPath protectionEnhancements in MPLS-TPOAM-triggered protectionOptimizing protection in ring topologiesCircuit networks are interconnected ringsFast reroute works but inefficientWrapping and steering implemented in MPLS-TP27.09.2012TM8106 Optical Networking - MPLS-TP#SynchronizationApproachesAn overlay synchronization networkRequires parallel networkDistributed reference clockReference clock at least at the edgesForwarding of clock information across packet domainSynchronization protocol

27.09.2012TM8106 Optical Networking - MPLS-TP#Synchronization (contd..)Packet based clock recover solutionAdaptive TimingEncapsulated and de-capsulated at packet edge nodes between TDM and packet domainDifferential Timing Both edge nodes performing inter-working have access to reference clock27.09.2012TM8106 Optical Networking - MPLS-TP

#Physical Infrastructure SupportMPLS-TP over SDH/SONET, PDH and OTNITU-T defines Generic Framing Procedure (GFP)Encapsulate variable length payload of various client signalContains User Payload Identifier (UPI)MPLS-TP uses same UPI point code as MPLSOTN includes WDM network layer for transport of a variety of OTN client signalsSONET/SDH uses virtual concatenation to form transmission pipelines with larger capacitiesMPLS-TP over Gigabit EthernetTwo-octet long Ether Type field in Ethernet II Indicates which protocol is encapsulated in payload

27.09.2012TM8106 Optical Networking - MPLS-TP#Deployment OptionsAccess and aggregation networkMajor migration from circuit to packet happening nowadaysOAM enhancements will allow more visibility into Core 27.09.2012TM8106 Optical Networking - MPLS-TP

#Misconceptions about MPLS-TPMPLS-TP is a new technology, not part of MPLSIt is a subset of MPLS with some enhancementsExtensions in MPLS-TP are not applicable in MPLSActually meant to apply in MPLS to make it broadly applicableMPLS-TP requires substantial changes in MPLSDesign goal of MPLS-TP is to keep MPLS architectureMPLS-TP require static provisioningSupports both static and dynamic control planesRequires forklift hardware upgradesMight be true for some vendors, but not always, not in Juniper at least27.09.2012TM8106 Optical Networking - MPLS-TP#ConclusionMPLS-TP is Subset of MPLS/GMPLSEnhancements esp. OAMFault managementPerformance monitoringE2E integration with existing and next generation MPLS networksMPLS-TP intended to Tie together service routing transport platformsAdvantages of tying togetherConsistent operations and OAM functions across networksSeamless interworking with IP/MPLS networksScalability due to multiplexing capabilitySupports huge variety of services encapsulated into pseudowires

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