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Proceedings Paper

Technique analysis of T-MPLS OAM and MPLS-TP OAM
Author(s): Xiang Yun; Zhong Wang
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Paper Abstract

OAM plays an important role in PTN technology. The main function of OAM is check defect before abnormal event. The bit errors which could be corrected or time deviation could be isolated within a certain range. It dose not disturb network operation. And therefore, it ensure carrier to fulfill QoS commitment and reach SLA subscription.T-MPLS is connection-oriented packet transport technology. Connection-oriented means it can provide carrier-level service and must have equal OAM (Operation, Administration and Maintenance) function of traditional transport network. OAM mechanism becomes key technology of T-MPLS. OAM function is very important to telecom network. It's especially import to network which has QoS. OAM could simplify network operation, check network performance and reduce operation cost. Firstly, the functional requirements of T-MPLS OAM and MPLS-TP OAM are analyzed. The similarity of T-MPLS OAM and MPLS-TP OAM is founded. By deep analysis the mechanism of T-MPLS OAM, it shows that the OAM is import for PTN. Then OAM technique of T-MPLS and MPLS-TP is analyzed in detail. At last, analysis of commonality is carried out on function types. Domain reference model and nesting-technique shows the consistency of both OAM functions. Both of T-MPLS and MPLS-TP introduce OAM nesting. Eight MEG Levels (from 0 to 7) are available to accommodate different network deployment scenarios. In order to distinguish OAM packets of nested MEGs, each MEP tunnels incoming OAM packets by incrementing the MEL in the source direction and decrementing it in the sink direction. Each MEP/MIP generates and processes OAM packets at the MEL=0, while other OAM packets are forwarded with traffic. It's very simple and high efficiency method. By comparing the functions of T-MPLS OAM and MPLS-TP OAM, even there are few differences on PTN implementation detail; the OAM mechanism and framework are basically same. Both of them meet the requirements of carrier-grade OAM. They has important role in their realization process. As long as posses powerful OAM capability, PTN has more competitiveness in the future market.

Paper Details

Date Published: 29 October 2009
PDF: 7 pages
Proc. SPIE 7514, Photonics and Optoelectronics Meetings (POEM) 2009: Fiber Optic Communication and Sensors, 751415 (29 October 2009); doi: 10.1117/12.843167
Show Author Affiliations
Xiang Yun, FiberHome Telecommunication Technologies Co., Ltd. (China)
Zhong Wang, Wuhan Institute of Technology (China)

Published in SPIE Proceedings Vol. 7514:
Photonics and Optoelectronics Meetings (POEM) 2009: Fiber Optic Communication and Sensors
Dieter Stefan Jäger; Hequan Wu; Shuisheng Jian; Desheng Jiang; Deming Liu; Weiwei Dong; Qizhen Sun; Xiaochun Xiao, Editor(s)

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