Carrier Ethernet OAM - apricot

79 Pages·2013·4.48 MB·English

by  Santanu Dasgupta

Carrier Ethernet
Operations, Administration & Maintenance
Santanu Dasgupta

1
Acknowledgement
  Jose Liste
  Sudarshan Pathalam
2
Agenda
  OAM Overview
  Ethernet OAM – Protocol Overview
IEEE 802.3ah – Link OAM, also known as EFM
IEEE 802.3ag – Connectivity Fault Management (CFM)
ITU Y.1731 – Fault & Performance Management
MEF E-LMI – Configuration Management
  Ethernet Service Activation Testing
  OAM Interworking
  Sample Fault Management Scenarios
  Ethernet OAM Deployment Use Cases
  Summary
3
Operations, Administration & Maintenance
  F – Fault Management
  C – CFonfiguraCtion ManaAgement PS
  A – Accounting
  P – Performance Management
  S – Security Management
OAM Protocols and Mechanisms helps operator to
achieve some of the FCAPS functionality

OAM capability is one of the key differentiator to
make a SP network truly “Carrier Grade”
4
Problem Scope
A few possible scenarios
Excessive Uni-directional
D-LDP session
Encoding Errors Link Duplex
failure
SP Network mismatch
Access Core VC failure
Excessive
Customer
Equipment FCS Errors
U-PE D C-VLAN
N-PE 1 N-PE 3
to EVC
U-PE A MPLS
CrosCsE- connected mismatchC E
Unexpected SONET/SDH
LSP Speed
Service Native
Endpoint Failure
Ethernet mismatch
PW
CE
N-PE 4 CE
U-PE B
MPLS U-PE C
N-PE 2
AC
Ethernet UNI Ethernet UNfaI ilure
Physical
PW failure
link failure
Physical VLAN to VFI
link failure xconnect failure
UNI VFI
port failure failure
Physical
U-PE P-Router link failure
device failure failure
5
OAM: The Concept
 
Operations, Administration, Maintenance & Provisioning:
− fault indication − performance monitoring
− security management − diagnostic functions
− configuration & service provisioning
  OAM covers both Nßà S and WßàE interfaces
Management Plane
N
(NMS / EMS)
ß
à

S

Network Plane
(Elements)
W ßà E
6
Scope of Ethernet OAM
  Operations, Administration, Maintenance & Provisioning:
− fault indication − performance monitoring
− security management − diagnostic functions
− configuration & service provisioning
  OAM covers both Nßà S and WßàE interfaces
Management Plane
N
(NMS / EMS)

ß
Primary Focus of Ethernet OAM protocols is on W ßà E inàteractions

S
(across NEs)

Network Plane
(NEs)
W ßà E
7
Focus Areas of Ethernet OAM
UNI UNI
Access Aggregation Edge Core Edge Aggregation Access
U-PE PE-AGG N-PE N-PE PE-AGG U-PE
Core Core
EPL
  EVPL
  EP-­‐LAN
  EVP-­‐LAN
  EP-­‐TREE
  EVP-­‐TREE
  AC
 EPL
  AC
 EVPL

CE Services &
Network Infrastructure
Fault Management Config Management Performance Management
Fault Detection
Frame Loss Measurement
Fault Notification
Delay Measurement
Service Provisioning
Fault Verification
Delay Variation Measurement
Fault Isolation
Availability Measurement
Fault Recovery
8
Ethernet OAM
Building Blocks
PMearnfoargmemanecnet ManFaagueltm ent
Performance
ManaPMgearnfoaergmemamnecnet ent ManFaagueltm ent
Configuration
ManCaMoannfgiaggueremateionmnt ent E - LEM- LI M I I P S L A s
CMoannfiagguermateionnt
8 0 2 . 1 a g / Y. 1 7 3 1
8 0 2 . 3 a h
Fault
PMearnfoargmemanecnet ManaMagnFaagueeltm emnt ent
CMoannfiagguermateionnt
  IEEE 802.1ag: Connectivity Fault Management (CFM)
  IEEE 802.3ah: Ethernet Link OAM (EFM OAM)
  ITU-T Y.1731: OAM functions & mechanisms for Ethernet based networks
  MEF E-LMI: Ethernet Local Management Interface
  IP SLA’s: Performance Management using CFM and Y.1731 mechanisms
9
Carrier Ethernet OAM
Protocol Positioning
Connectivity
Customer AggEreA-LgcaMcteiIo sns Fault MCaonrae gement Aggregation Customer
Y.1731 Performance
Business Management Business
MPLS
OAM
Ethernet Ethernet
Ethernet MPLS/IP
MPLS/IP MPLS/IP
Link OAM
Residential
Residential
UNI NNI NNI NNI UNI
  E-LMI – User to Network Interface (UNI)
  Link OAM – Any point-point 802.3 link
  CFM, Y.1731 PM – End-to-End UNI to UNI
  MPLS OAM – within MPLS cloud
10