Download - TM8106 Optical Networking
![Page 1: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/1.jpg)
1
TM8106Optical Networking
Multi-Protocol Label Switching-Transport Profile(MPLS-TP)
ByAmeen 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.
![Page 2: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/2.jpg)
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
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 3: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/3.jpg)
3
Transport Networks• Goal of transport network
• Requirements
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 4: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/4.jpg)
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)27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 5: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/5.jpg)
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
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 6: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/6.jpg)
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
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 7: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/7.jpg)
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
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 8: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/8.jpg)
8
Standardization History
• ITU-T will define requirements
• IETF will work on protocol extensions
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 9: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/9.jpg)
9
MPLS-TP Components
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 10: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/10.jpg)
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
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 11: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/11.jpg)
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
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 12: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/12.jpg)
12
OAM Enhancements
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 13: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/13.jpg)
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
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 14: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/14.jpg)
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 plane27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 15: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/15.jpg)
15
MPLS-TP Control Plane (contd…)
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 16: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/16.jpg)
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-TP27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 17: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/17.jpg)
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
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 18: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/18.jpg)
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
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 19: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/19.jpg)
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 payload27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 20: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/20.jpg)
20
Deployment Options
• Access and aggregation network
Major migration from circuit to packet happening nowadays
• OAM enhancements will allow more visibility into Core
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 21: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/21.jpg)
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
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 22: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/22.jpg)
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
27.09.2012TM8106 Optical Networking - MPLS-TP
![Page 23: TM8106 Optical Networking](https://reader033.vdocuments.us/reader033/viewer/2022051118/568163e3550346895dd54297/html5/thumbnails/23.jpg)
23 27.09.2012TM8106 Optical Networking - MPLS-TP