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Evaluating Network Survivability Metrics in Multi-Domain Generalized MPLS Networks

This document presents a comprehensive evaluation of network survivability metrics critical for Multi-Domain Generalized MPLS Networks. It outlines the importance of fault management, including phases such as detection, localization, isolation, notification, recovery, and reversion. Emphasis is placed on minimizing recovery time through optimized methodologies in fault management and recovery processes. Insights on single and multi-domain scenarios highlight delays associated with fault localization and notification signals. Proposed protocol extensions to enhance survivability are also discussed.

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Evaluating Network Survivability Metrics in Multi-Domain Generalized MPLS Networks

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  1. Network Survivability Evaluation Metrics in Multi-domain GeneralizedMPLS Networks draft-Zhangm-ccamp-reroute-00 MinZhangmzhang@bupt.edu.cn LifangZhangcapricorn7111@hotmail.com Yuefeng Ji jyf@bupt.edu.cn Hongxiang Wang wanghx@bupt.edu.cn (Beijing University of Posts and Telecommunications) Yu Wang wangyu@mail.mitt.com.cn (China Academy of Telecommunication Research of MIIT) IETF 79,BUPT,China,NOV 7-12,2010

  2. 1 2 3 4 Protocol Extension Methodologies Next Steps Contents Motivation IETF 79,BUPT,China,NOV 7-12,2010

  3. Motivation ● Importance of network survivability -phase 1: fault detection -phase 2: fault localization and isolation. -phase 3: fault notification. -phase 4: recovery. -phase 5: reversion. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- | Fault management | Backup path | Recovery | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- | TDET TLOC TNOT | TBR TBS TBA TSW TCR | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- -traffic delay, -packet losses , -resource collision, preemption, -service discontinue, -can’t reach the level of reliability ● Recovery Process: • Motivation: -measure every phase recovery time -reduce the whole recovery time -optimize network IETF 79,BUPT,China,NOV 7-12,2010

  4. Txt Text Methodologies Single Domain Scenario: 1. ChannelStatus PathErr 4 2 3 Service ChannelStatusAck 5 1 3. ChannelStatus Sum= T2-T1 + + T6-T5 T4-T3 Fault localization delay isT2-T1 Notification delay is T4-T3 Recovery time is T6-T5 Multi-domain Scenario: Domain 2 Domain 3 Domain 1 IETF 79,BUPT,China,NOV 7-12,2010

  5. Protocol Extension Protocol Extension necessity • Assumption clock synchronization • LMP (ChannelStatus Message ) FAULT_TIMESTAMP Object record the time of signaling sent and received • RSVP(PathErr) SEND_ERR_TIMESTAMP Object RECEIVE_ERR_TIMESTAMP Object record the time of notification signal sent and received IETF 79,BUPT,China,NOV 7-12,2010

  6. NextSteps Any Comments? IETF 79,BUPT,China,NOV 7-12,2010

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