1 / 23

TM8106 Optical Networking

TM8106 Optical Networking. Multi-Protocol Label Switching-Transport Profile (MPLS-TP) By Ameen Chilwan. Syllabus: [1] MPLS Transport Profile (MPLS-TP): A Set of Enhancements to the Rich MPLS Toolkit, Juniper Networks , Whitepaper, 2011.

wren
Download Presentation

TM8106 Optical Networking

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. TM8106Optical Networking Multi-Protocol Label Switching-Transport Profile (MPLS-TP) By Ameen Chilwan Syllabus: [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.

  2. Outline • Transport Networks • MPLS-TP Basics • Standardization History • MPLS-TP Components • OAM • Control Plane • Resiliency • Synchronization • Physical Infrastructure Support • Deployment Options • Misconceptions about MPLS-TP • Conclusion TM8106 Optical Networking - MPLS-TP

  3. Transport Networks • Goal of transport network • Requirements TM8106 Optical Networking - MPLS-TP

  4. Packet-based Transport Network • MPLS has been serving as one for almost a decade • Connection-oriented and Packet-based • Designed to carry L3 IP Traffic • Establishes IP traffic paths • Associates these paths with arbitrarily assigned labels • GMPLS extends MPLS • Label switching for • TDM (SONET/SDH) • Wavelength (λ) • Spatial switching (incoming ports to outgoing ports) TM8106 Optical Networking - MPLS-TP

  5. MPLS-TP Emergence • Lacks some features of SDH-like networks • Operation, Admin and Management (OAM) • Resiliency • Scalable operations • High availability • Performance monitoring • Multi-domain support • IETF and ITU-T joined forces to enhance MPLS • MPLS-TP TM8106 Optical Networking - MPLS-TP

  6. MPLS-TP Background • Drivers for MPLS-TP • Rise in demand for service sophistication • Bandwidth-hungry services • Pressure to reduce operational cost (OPEX) • Maximize the value per bit • Lead to a technology that is almost SDH-like • Carrier-grade • Packet-switched • With OAM features TM8106 Optical Networking - MPLS-TP

  7. MPLS-TP Overview • Takes a subset of MPLS/GMPLS • Enhance with some functionalities • Network Management (e.g. FCAPS) • Dynamic provisioning of transport paths via control plane • Provide restoration functions • E2E path provisioning across networks/domains • Characteristics • Connection oriented • Client and physical layer agnostic • OAM similar to SDH-like networks • Protection schemes • Network provisioning via centralized NMS • GMPLS Control plane applicable TM8106 Optical Networking - MPLS-TP

  8. Standardization History • ITU-T will define requirements • IETF will work on protocol extensions TM8106 Optical Networking - MPLS-TP

  9. MPLS-TP Components TM8106 Optical Networking - MPLS-TP

  10. Operation, Admin and Management • Dedicated OAM packet • interspersed into the associated user traffic flows • Created and processed by maintenance end-points • Intermediate points can also process them & collect data • OAM Tools TM8106 Optical Networking - MPLS-TP

  11. OAM Functions and Tools • Functions • Fault 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 Ping • LSP Trace TM8106 Optical Networking - MPLS-TP

  12. OAM Enhancements TM8106 Optical Networking - MPLS-TP

  13. Associated Channel (ACh) • MPLS-TP shall work without IP functionality • MPLS uses Ach for framing, forwarding and encapsulation • Enhanced by GACh and GACh Label (GAL) • Support in-band control channels • GACh • Ensure congruency between OAM packets and data path • Indicates tagged packet must be processed by special function • Not suitable for static provisioning • Because negotiated when pseudowire was setup • Solved using GAL (reserved value of 13) • Enables easy extraction at end- and mid-point nodes TM8106 Optical Networking - MPLS-TP

  14. Control Plane (Static and Dynamic) • Responsible for setup of LSP • MPLS has mature and dynamic control plane • OSPF-TE, IS-IS-TE, RSVP-TE and BGP • Current transport networks have static control plane • using NMS • MPLS-TP • Can have both static or dynamic • Dynamic has advantages like: • Scaling • Advanced protection functions (e.g. LSP tail-end protection) • Restoration • Distributed control plane • Signaling, routing and TE • Decoupled from data plane TM8106 Optical Networking - MPLS-TP

  15. MPLS-TP Control Plane (contd…) TM8106 Optical Networking - MPLS-TP

  16. Resiliency • Mechanisms in MPLS • LSP fast reroute • Pseudowire redundancy • Path protection • Enhancements in MPLS-TP • OAM-triggered protection • Optimizing protection in ring topologies • Circuit networks are interconnected rings • Fast reroute works but inefficient • Wrapping and steering implemented in MPLS-TP TM8106 Optical Networking - MPLS-TP

  17. Synchronization • Approaches • An overlay synchronization network • Requires parallel network • Distributed reference clock • Reference clock at least at the edges • Forwarding of clock information across packet domain • Synchronization protocol TM8106 Optical Networking - MPLS-TP

  18. Synchronization (contd..) • Packet based clock recover solution • Adaptive Timing • Encapsulated and de-capsulated at packet edge nodes between TDM and packet domain • Differential Timing • Both edge nodes performing inter-working have access to reference clock TM8106 Optical Networking - MPLS-TP

  19. Physical Infrastructure Support • MPLS-TP over SDH/SONET, PDH and OTN • ITU-T defines Generic Framing Procedure (GFP) • Encapsulate variable length payload of various client signal • Contains User Payload Identifier (UPI) • MPLS-TP uses same UPI point code as MPLS • OTN includes WDM network layer for transport of a variety of OTN client signals • SONET/SDH uses virtual concatenation to form transmission pipelines with larger capacities • MPLS-TP over Gigabit Ethernet • Two-octet long Ether Type field in Ethernet II Indicates which protocol is encapsulated in payload TM8106 Optical Networking - MPLS-TP

  20. Deployment Options • Access and aggregation network • Major migration from circuit to packet happening nowadays • OAM enhancements will allow more visibility into Core TM8106 Optical Networking - MPLS-TP

  21. Misconceptions about MPLS-TP • MPLS-TP is a new technology, not part of MPLS • It is a subset of MPLS with some enhancements • Extensions in MPLS-TP are not applicable in MPLS • Actually meant to apply in MPLS to make it broadly applicable • MPLS-TP requires substantial changes in MPLS • Design goal of MPLS-TP is to keep MPLS architecture • MPLS-TP require static provisioning • Supports both static and dynamic control planes • Requires forklift hardware upgrades • Might be true for some vendors, but not always, not in Juniper at least TM8106 Optical Networking - MPLS-TP

  22. Conclusion • MPLS-TP is • Subset of MPLS/GMPLS • Enhancements esp. OAM • Fault management • Performance monitoring • E2E integration with existing and next generation MPLS networks • MPLS-TP intended to • Tie together • service routing • transport platforms • Advantages of tying together • Consistent operations and OAM functions across networks • Seamless interworking with IP/MPLS networks • Scalability due to multiplexing capability • Supports huge variety of services encapsulated into pseudowires TM8106 Optical Networking - MPLS-TP

  23. TM8106 Optical Networking - MPLS-TP

More Related