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Network Survivability Evaluation Metrics in Multi-domain Generalized

MPLS Networks

IETF 79,BUPT,China,NOV 7-12,2010

draft-Zhangm-ccamp-reroute-00

Min Zhang mzhang@bupt.edu.cnLifang Zhang capricorn7111@hotmail.comYuefeng 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)

Contents

1

Methodologies2

Protocol ExtensionProtocol Extension3

Next Steps4

Motivation

IETF 79,BUPT,China,NOV 7-12,2010

Motivation

-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 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

IETF 79,BUPT,China,NOV 7-12,2010

Recovery Process:

Motivation:

●

●

-measure every phase recovery time-reduce the whole recovery time -optimize network

Importance of network survivability -traffic delay, -packet losses ,

-resource collision, preemption,

-service discontinue,

-can’t reach the level of reliability

Methodologies

Txt

Text

IETF 79,BUPT,China,NOV 7-12,2010

Single Domain Scenario:

Multi-domain Scenario:

12

34

5

1. ChannelStatus

ChannelStatusAck

3. ChannelStatus

T2-T1

PathErr

T4-T3 T6-T5

Service

Sum= + + Fault localization delay isT2-T1

Notification delay is T4-T3

Recovery time is T6-T5

Domain 1

Domain 2Domain 3

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

Protocol Extension

IETF 79,BUPT,China,NOV 7-12,2010

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IETF 79,BUPT,China,NOV 7-12,2010

Any Comments?