8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
1/30
1
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
2/30
2
Agenda
Elements of a Global Network UNI Type II
ENNI Class of Service Alignment
OAM Enables Global Interconnect End-to-End OAM Architecture
Service OAM Fault Management
Service OAM Performance Management
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
3/30
3
Ubiquitous Footprint Drives Interconnect
Expanding ServiceAreas andAcquiring New Customers
National and Global Service Providers need Local Service Providers(Operators) for Local Access
Local Operators need new revenues from wholesaling to Global
Service Providers Multi-operator networks are more complex
Challenge: maintain service consistency across the network
Challenge: end-to-end fault detection and performance monitoring(a.k.a. OAM)
CarrierA
Carrier B
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
4/30
4
Carrier Ethernet Demarcation Points
UNI - User-to-Network Interface Demarcation point between Service Provider and
Subscriber
Ethernet Service starting point and ending point
ENNI - External Network-to-Network Interface Demarcation point between operators
EVC - Ethernet Virtual Connection
Ethernet service connecting two or more UNIs
Subscriber Subscriber
Access NetworkAccess Network
ProviderProvider
TransportTransport
NetworkNetwork
ProviderProvider
Ethernet ServiceEthernet Service
ProviderProvider
EVCEVC
ENNI ENNI
UNI
UNI
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
5/30
5
User to Network Interface (UNI)
Defines an Ethernet service
demarcation point between customer(subscriber) and service provider
Uses a physical Ethernet Interfaceatoperating speeds 10Mbs, 100Mbps,
1Gbps or10Gbps
Defines service personality serviceattributes, traffic classification,
bandwidth profiles, tagging, etc.
Service Providerresponsibility
Carrier Ethernet
Network
CE
CE
Customer
responsibilityUNI
UNI
NID
NID
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
6/30
6
Mandatory Features
Backward comp. toUNI Type 1
Service OAM
Enhanced UNI
attributes L2CP Handling
Optional Features
Link OAM
Protection
E-LMI
UNI Type 2.1
MEF UNI Attributes
UNI type1 (MEF 13) Defines service attributes
Traffic classification & bandwidthprofile(s)
UNI type2 (MEF 20)
Mandatory Features
Backward comp. toUNI Type 1
Service OAM
Enhanced UNI
attributes L2CP Handling
Link OAM
Protection
E-LMI
UNI Type 2.2
ForGlobal Interconnect, support
forend-to-end OAM is mandatory
Provides fault detection andperformance monitoring forsubscriber, operator and serviceprovider
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
7/30
7
Proprietary implementations
Limited in features, proprietaryand/or ad-hoc
Require extensive coordination
between operators to match theirservice, operation and interfacecapabilities
Very long turn-up time
OperatorA
Operator C Operator D
Proprietaryinterconnect
Proprietaryinterconnect
Operator B
Proprietaryinterconnect
Proprietaryinterconnect
OperatorA
Operator C Operator D
Operator B
ENNIENNI
ENNI
ENNI
MEF Standardized Interconnect
Provide wide range of well definedstandardized services to enterprisecustomers
Standardized interconnects (ENNI)streamline operators interconnectoperations; reduces time-to-market andtime-to-revenue
Easily scalable to enable alignmentbetween investment and revenue
External Network-to-Network Interface (ENNI)
Proprietary Implementation vs. Standardized Ethernet Interconnects
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
8/30
8
Physical Interface
ServiceAttributes
L2CP Handling
Service Mapping
ServiceTunneling
OAM Class of Service
Protection
Requirements
MEF ENNI Attributes
ENNI specification is infinal stages of approvaland ratification by MEF(Planned 2010H1)
UNIUNIENNIENNIUNIUNI
Link OAM
IEEE 802.3ah
Service OAM
IEEE 802.1ag(for fault detection)
ITU-T Y.1731
(for performance monitoring)
OAM
CoS
CoSAlignment
Reference
Point
Ethernet Virtual Connection
Operator 1network
Operator 2network
Critical Area !
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
9/30
9
What is Class of Service ?
A specific performancelevel fora particular type ofservice traffic
For example: Video, Voice = high
Data storage = medium
File transfer = low
Servicenames and types vary Example: Silver, Gold, Platinum
Example: Economy, Premium, PremiumPlus
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
10/30
10
Class of ServiceAlignment [MEF 23]
Solving the problem ofClass of Service spanningtwo or more ServiceProviders requires:
Common Class ofService lexiconbetween the serviceproviders on eitherside of thestandardized Ethernetinterconnect
Alignment of therespective Classes of
Service at the ENNI
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
11/30
11
Scope & Applicability
UNI Carrier Ethernet CoS IA
Application Point (recommended
PCP/DSCP values, mandatory
Performance Objectives)
ENNI Carrier Ethernet CoS IA
Application Point (mandatory PCP
Values if802.1adand mandatory
Performance Objectives)CE CE
Multipoint EVC
Multipoint EVC
Point-Point EVC
MEN
MEN
MEN 2MEN 1
UNIUNI
CECE
CE CE
UNI UNI
UNI UNI
UNI UNI
Point-Point EVC
MEN 2MEN 1
CE CE
UNIUNI ENNI
The scopeandapplicability of the Class of Service ImplementationAgreement
(MEF 23) to both UNI and ENNI, to both Multipoint and Point-Point and to both
singleand multipleMENs is represented here:
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
12/30
12
MEF 23 ina Nutshell
Carrier Ethernet CoS ImplementationAgreement Phase1
Specifies a 3 CoS Modelandallows for subsets andextensions
CoS IA PCP or DSCP values recommended for UNI
CoS IA S-tag PCP values mandatory for ENNI
PCP/DSCP mandatory values are subset of the total value
Guidance on Bandwidth Profile constraints Includes consideration for frame disposition (i.e., Color)
Performance Objectives for FD, IFDV/FDV and FLR positionedasplaceholders (define inMEF Phase2)
Quantification in future phase (will likely add MFD and FDR)
May vary for Point to Point vs Multipoint EVC types Positions for future certification
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
13/30
13
Global Interconnect: ENNI and OAM
AgendaElements of a Global Network
UNI Type II
ENNI
Class of Service Alignment
OAM Enables Global Interconnect
End-to-End OAM Architecture
Service OAM Fault Management
Service OAM PerformanceManagement
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
14/30
14
What Makes an EthernetService Provider Attractivefor Enterprise Customers?
Driving Demand for Service OAM: Reliability
Reliability is Essential to Enterprise Customers
2008 Report from
Heaving Reading:
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
15/30
15
Driving Demand for Service OAM: SLAs
SLAs are an essential element of Carrier Ethernet
Frame Relay, Private Line, ATM support SLAs
Subscribers want SLAs and proof of compliance Management and reporting are a key element of the solution
Global Interconnect present challenges for SLAs Need tools to determine performance and quickly isolate fault
locations across multiple operators
What is holding service providers back from
deploying Ethernet moreaggressively?
16% Better alternative solutions
66% Performance monitoring/SLAs inadequate
18% Price
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
16/30
16
Driving Demand for Service OAM: OPEX
Reducing Operating Costs is essential to Service Providers
The cost of truck rolls range from $200 to $400 per event
Service OAM provides the maintenance and troubleshooting toolsequivalent to TDM services
Service OAM enables the combination of
Low CAPEX of Ethernet equipment
Low OPEX equivalent to TDM equipment.
LegacyServices
CarrierEthernet
OPEX
CAPEX
Best EffortEthernet
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
17/30
17
Ethernet OAM Jurisdictions
Operator1Customer
SiteOperator2
Customer
Site
ENNI UNIUNI
Service OAM
Link OAM IEEE 802.3ah Link OAM
Link OAM
IEEE 802.1ag End-to-End Connectivity Fault Management
ITU-T Y.1731 End-to-End Performance Monitoring
NID NID
MEF
NID/U
NI
MEF
NID/U
NI
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
18/30
18
Link OAM
IEEE802.3ah - Ethernet in the First Mile (EFM)
First Ethernet OAM standard completed (2004)
Supports: Remote loopback
Remote failure indication (dying gasp, link faultand critical event) Link monitoring Loopback Control Discovery
Focused on point to point Ethernet link OAM Does not propagate beyond a single link or hop Maintenance OAM, not service
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
19/30
19
Link OAM
Operator1Customer
PremisesOperator2 Customer
Premises
ENNIUNIUNI
802.3ah 802.3ah 802.3ah 802.3ah 802.3ah 802.3ah 802.3ah802.3ah
IEEE 802.3ah Per physical network link (point-to-point): Good for single links, but does not monitor across EVC
Used for troubleshooting network links
802.3ah
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
20/30
20
End-to-End Service OAM
What is Service OAM?
Enables fault detection and performance monitoring of theEthernet Service (EVC) from End-to-End
Uses synthetic traffic
Supports multiple layers of OAM and maintenance regions
Supports multiple networks and operators
Includes:
IEEE 802.1ag provides Connectivity Fault Management
ITU-T Y.1731 provides Performance Monitoring
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
21/30
21
Service OAM - Domains
A flat network is difficult to manage and define accountabilities
Hierarchical Maintenance Domains define OAM Flows and OAMresponsibilities Maintenance Domain (MD) defines the boundary of responsibility of each
stakeholder as a specific level within the network Maintenance Association (MA) defines the path of the service within each
MD level
Operator1Customer
PremisesOperator2 Customer
Premises
ENNIUNIUNI
OperatorMAOperatorMA
CustomerMA
ProviderMA
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
22/30
22
Maintenance End Points (MEP) End Points that define the
boundaries of the MA Maintenance Intermediate Points (MIP) Intermediate Points
within MA
Service OAM Framework - Detail
Operator1Customer
PremisesOperator2 Customer
Premises
ENNIUNIUNI
ProviderMA
OperatorMAOperatorMA
CustomerMA
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
23/30
23
802.1ag Connectivity Fault Management
802.1ag CFM Defines the Framework for Service OAM
Provides mechanisms to detect, verify, isolate and reportend-to-end Ethernet connectivity faults Connectivity Check Message fault detection during operation Loopback test Linktrace fault isolation
Scalable to provide connectivity checking and fault detectionacross multiple networks and multiple domains Partitions the network into Domains to define responsibilities
of different stakeholders.
Supports up to 8 Maintenance Domains
Connectivity Fault Management provided byConnectivity Fault Management provided byCarrier Ethernet network elements and NIDsCarrier Ethernet network elements and NIDs
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
24/30
24
Service OAM - Continuity Check
Continuity Check Message (CCM) OAMPDUs provideperiodic monitoring function exchanged between MEPs
Continuous, non-intrusive monitoring proactively tests circuit
Operator1Customer
PremisesOperator2 Customer
Premises
ENNIUNIUNI
ProviderMA
OperatorMAOperatorMA
CustomerMA
MEP 1 MEP 2
CCMCCM
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
25/30
25
Service OAM Link Trace
Link Trace Message (LTM) and Link Trace Response (LTR) An initiated command to trace intermediate points (MIP) from
one end point (MEP) to another end point (MEP)
Finds faults in defined MAs along an Ethernet Service
Operator1Customer
PremisesOperator2 Customer
Premises
ENNIUNIUNI
ProviderMA
OperatorMAOperatorMA
CustomerMA
LTM
LTR
MEP 1 MEP 2
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
26/30
26
ITU-T Y.1731 PerformanceMonitoring
ITU-T Y.17
31 Mechanisms that provide fault and performance
monitoring for point-to-point Ethernet services
Builds on 802.1ag functionality and adds:
Introduces performance measurements for SLA monitoring Delay Measurement (DM)
Delay Variation Measurement (DVM)
Loss Measurement (LM)
Expands on fault notification and isolation
Automatic Protection Switching (APS) G.8031
Ethernet Alarm Indication Signal function: Y.1731 ETH-AIS
Ethernet Test Signal function: Y.1731 ETH-TEST
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
27/30
27
Service PerformanceManagement
Key Metrics for PerformanceMonitoring1. Frame/Packet Delay Latency (e.g. UNI/UNI [email protected]%@15min)
2. Frame/Packet Delay Variation Jitter (e.g. [email protected]%@15min)
3. Frame/Packet Loss Ratio (e.g. CIR FL=1%@15min)
4. Service Availability (e.g. 99.99%@30days)
ITU-T has defined measurement metrics for items 1-3 Packet-based measurements (granularity to Class of Service)
ITU-T Y.1731 defines how to use 802.1ag to measure performance
MEF has defined measurement framework for items 1-4
Ethernet Frame-based measurements MEF 10.1 defines formulae for metrics calculation
The combination of IEEEThe combination of IEEE 802802..11ag, ITUag, ITU--T Y.T Y.17311731and MEFand MEF 1010..11 define Ethernet Service Performancedefine Ethernet Service Performance
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
28/30
28
Point-to-Point EVCPoint-to-Point EVC
CarrierA
ENNI
UNI
UNI
Link OAM
802.3ah
E2E Service OAM:Fault-802.1ag
Perform-Y.1731
Carrier B
EnablingGlobal Interconnect
CoS
Alignment
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
29/30
29
Summary
Implementation of Ethernet interconnects has begun and will rapidly
accelerate in 2010 To enable the growth of Carrier Ethernet, Interconnect SPs need to:
Deliver high reliability/up-time Commit-to and deliver SLAs Provide services efficiently with low OPEX
MEF specifications, certification and operational tools provide acommon and efficient framework for Carrier Ethernet interconnects UNI and ENNI specifications
OAM Solutions
P2P Link OAM (802.3ah) Link Fault Monitoring
E2E Service OAM (802.1ag) Service Fault Monitoring E2E Service OAM (Y.1731) Service Performance Monitoring
Enables the Global InterconnectEnables the Global Interconnect
8/3/2019 Global Interconnect ENNI UNI OAM 2010 Jan 06
30/30
30
Thank YouThank You
For more information, visit:
www.metroethernetforum.org