1. draft-Zhangm-ccamp-reroute-00
Network Survivability Evaluation Metrics in Multi-domain Generalized MPLS Networks
draft-Zhangm-ccamp-reroute-00
Min Zhang
Lifang Zhang
Yuefeng Ji
Hongxiang Wang
(Beijing University of Posts and Telecommunications)
Yu Wang
(China Academy of Telecommunication Research of MIIT)
IETF 79,BUPT,China,NOV 7-12,2010

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

3. Motivation ● Importance of network survivability ● Recovery Process:
-traffic delay, -packet losses ,
-resource collision, preemption,
-service discontinue,
-can’t reach the level of reliability ●
-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 |
Recovery Process:
Motivation:
-measure every phase recovery time
-reduce the whole recovery time
-optimize network
IETF 79,BUPT,China,NOV 7-12,2010

4. Methodologies Txt Text Single Domain Scenario: 4 2 3 5 1 Sum= T2-T1 +
1. ChannelStatus
PathErr 4 2 3
Service
ChannelStatusAck 5 1
3. ChannelStatus
Sum=
T2-T1 +
T4-T3 +
T6-T5
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. Next Steps
Any Comments?
IETF 79,BUPT,China,NOV 7-12,2010