1. Ethernet Access Services Definition and Implementation

2. Co-presented by: Arie Goldberg Ralph Santitoro
Omnitron CEO and Founder
MEF Board Member
Ralph Santitoro
Director of Carrier Ethernet Solutions

3. Ethernet Service Delivery over Different Access Network Technologies
10/100BaseT
10/100BaseT
Ethernet over Fiber (EoF)
EoDSL
Ethernet Service Provider
Ethernet over SDH (EoS)
10/100BaseT
Ethernet over PON/WDM
Ethernet over HFC
Ethernet over PDH (EoPDH)
10/100BaseT
Coax
10/100BaseT
Ethernet can be delivered over many different types of access network technologies

4. Fundamental Ethernet Service Components
UNI
I-NNI
Access/Aggregation Network
E-NNI
E-NNI
Metro Transport / Core Network
Access/Aggregation Network
EVC
UNI (User-to-Network Interface)
Physical interface/demarcation between service provider and subscriber
Service start/end point
NNI (Network-to-Network Interface)
Demarcation/peering point
between service providers (E-NNI)
between service provider internal networks (I-NNI)
Ethernet Virtual Connection (EVC)
Logical representation of an Ethernet service as defined by the associate between 2 or more UNIs
These Ethernet Service components are independent of the Access or Transport Network Technology to delivery the service

5. PDH (E1/T1) Access Network Provider MPLS Transport Network
Example of Ethernet Service Delivery over Different Access/Transport Technologies
Ethernet
Service Provider
UNI1
E-NNI
I-NNI
PDH (E1/T1) Access Network Provider
E-NNI
UNI2
MPLS Transport Network
Fiber Access Network
10Mbps EVC
PDH Access Network
EoPDH: N bonded E1s
MPLS Transport Network
Ethernet over MPLS
Fiber Access Network
Ethernet over Fiber (EoF)
PDH Access/Aggregation Network
UNI1: PDH access network bonds 5 E1s for 10Mbps EoPDH
E-NNI: 1Gbps Ethernet over Fiber (802.1ad / QinQ)
MPLS Transport Network
802.1ad frames mapped to MPLS transport network
I-NNI: 1Gbps Ethernet over Fiber (802.1ad / QinQ)
Fiber Access Network
UNI2: 10Mbps Ethernet over Fiber (EoF)
Subscriber is unaware of the various transport network technologies used to deliver this 10Mbps Ethernet Service

6. Ethernet Services and Ethernet Access to IP Services
Ethernet Services are Connectivity Services
Multi-site E-LAN
Ethernet Private LAN
Transparent LAN Service
VPLS
Site-to-Site E-Line
Ethernet Private Line
Ethernet Virtual Private Line
Ethernet Access to IP Services
Provide Layer 2 connectivity to IP Service Networks
Ethernet access to Internet
Ethernet access to Managed VoIP service
E-LAN
E-Line
Internet
E-Line
VoIP
Ethernet Service: Layer 2 Service End-to-End
Ethernet Access to IP Service: Layer 2 access to IP Service

7. Comparison of Ethernet L2 VPN and IP VPN Services in Access Network
Ethernet L2 VPN Service
UNI
EVC (service) identified via VLAN ID
CoS identified via PCP
Forwarding on MAC or VLAN ID
IP VPN Service
Port
Service identified via IP address
CoS identified via DSCP
Forwarding on IP Address
Service Provider
Service Attribute
Ethernet Service
IP Service
Customer Handoff
Ethernet UNI
Ethernet port (or PDH circuit)
Service Identification
VLAN ID / EVC
IP Address
CoS Identification
PCP
DSCP/ToS
Packet/Frame Routing/Forwarding
MAC Address (E-LAN)
VLAN ID (E-Line)
Fault Management
Link Trace, Continuity Check (Layer 2 Ping), Loopbacks
Traceroute, ICMP Ping
Performance Management
Frame Delay, Frame Delay Variation, Frame Loss Ratio, Service Availability
Packet Delay, Packet Delay Variation, Packet Loss,
Fundamental difference between Ethernet and IP Services in the access network is the information used to identify, forward and process service frames

8. Ethernet Access Service Attributes
Ethernet Service Performance Metrics, Bandwidth Profiles, CoS, Service Performance, and Fault Management

9. Ethernet Service Performance Management
Key Metrics
Frame/Packet Delay (Latency)
Frame/Packet Delay Variation (Jitter)
Frame/Packet Loss Ratio
Service Availability
Frame/Packet Goodput
ITU-T has defined measurement framework/metrics for items 1-3
IP packet-based measurements
ITU-T Y.1731 defines how to use 802.1ag to measure service performance
MEF has defined measurement framework for items 1-4
Ethernet Frame-based measurements
MEF 10.1 defines formulae for:
Frame Delay (FD), FD Variation, Frame Loss Ratio, Service Availability
The combination of IEEE 802.1ag, ITU-T Y.1731 and MEF 10.1 define Ethernet service performance

10. Ethernet Service Performance Metrics
Frame Delay (FD) and Frame Delay Variation (FDV)
Measured between UNI pairs via transmission and reception of a percentile of service OAM frames over a measurement period
Example:
FD: 30ms (99th percentile over 15 minute interval)
FDV: 10ms (99the percentile over 15 minute interval)
FD and FDV measurements can be One Way or Round Trip
Frame Loss Ratio (FLR)
Percentage of Green (in-profile for CIR) Ingress frames received at Egress UNI over a measurement period
Example FLR: 2% ( over 15 minute interval)
Service Availability
Percentile Amount of time, FLR meets its service level objectives over a measurement period
Example Availability: 99.9% (over 1 month interval)

11. Bandwidth Profiles (BWP) and CoS
Bandwidth Profiles per EVC (service) and per CoS
CIR (Committed Information Rate)
CIR assured via Bandwidth Reservation and Traffic Engineering
EIR (Excess Information Rate)
EIR bandwidth is considered ‘excess’
Traffic dropped at congestion points in the network
CBS/EBS (Committed/Excess Burst Size)
Higher burst size results in improved performance
EVC-2
EVC-1
EIR
EIR
CIR
CIR
EVC-3
EIR
CIR
CoS 6
1Mbps CIR for VoIP
EVC1
BWPs can divide bandwidth per EVC (service) over a single UNI
Multiple services over same port (UNI)
CoS markings enable the network to determine the network QoS to provide
CoS 2
10Mbps UNI
(port)
6Mbps CIR for VPN data traffic
UNI
EVC2
3Mbps for Internet Access
CIR defines the assured bandwidth EIR improves the network’s Goodput

12. Ethernet Service Connectivity Fault Management
IEEE 802.1ag for EVC Connectivity Fault Management
For Protection/Restoration
Connectivity Check Messages (CCMs) for heartbeats
For diagnostic purposes
Connectivity Check (Layer 2 Ping), Link Trace, Loopbacks
CCMs initiated between:
Management Endpoints (MEPs / UNIs)
Management Intermediate Points (MIPs / NNIs)
Management Endpoints and Intermediate Points (UNI-NNI)
Connectivity Fault Management provided by Carrier Ethernet network elements and NIDs

13. Ethernet Link Fault Management
IEEE 802.3ah for Link Fault Management for (first mile) Ethernet access connection
Link Fault Detection and Remote Loopbacks
Layer 1 fault management used for transport connections used to deliver Ethernet services
Ethernet over PDH
Ethernet over SDH
Ethernet over DSL
Ethernet over HFC Coax
Ethernet Link Fault Management performed by Carrier Ethernet network elements and NIDs

14. Ethernet Service Continuity Check
UNI
IP/MPLS Core
Network
UNI
Metro Aggregation
Network
Metro Aggregation Network
Access Network
Access Network
MEP#1
MEP #2
MIP
MIP
MIP
MIP
MIP
Maintenance Association (MA)
MIP
MEP #1
CCMs sent every 10ms on working/protect paths
Check for CCMs received from MEP #2 on working/protect paths
MEP #1
No CCMs received from MEP #2 within 30ms (3 x 10ms)
MEP #1
Report CC fault to management system
MEP #1
Send CCMs with RDI flag set
MEP #2
Remote alarm detected by received RDI
Report alarm to management system
MEP #2
Initiate
protection switchover
MEP #2
Report on CC fault if no CCMs are received from MEP #1 for 30ms
MEP #2
CCMs sent every 10ms
Check for CCMs received from MEP #1
Ethernet continuity check is analogous to IP’s Ping but does much more

15. Metro Aggregation Network
Ethernet Link Trace
UNI
IP/MPLS Core
Network
UNI
Metro Aggregation
Network
Metro Aggregation Network
Access Network
Access Network
MEP
MIP
MIP
MIP
MIP
MEP
Link trace Reply
Ethernet Link Trace is analogous to IP’s Traceroute

16. Some Benefits of Ethernet L2 VPN versus IP VPN
L2 VPN Service Benefit
Enterprise Benefits
Service Provider Benefits
No IP awareness required
Especially important with IPv6 applications
No service provider coordination of IP addresses
No concerns of service provider’s IPv6 capabilities
No need for service provider to have IPv6-capable routers
Fault management
Ethernet OAM versus IP, MPLS and Ethernet OAM
Simpler OAM (lower OpEx) by managing a single network layer
Perform just Ethernet OAM instead of Ethernet OAM + MPLS (OAM) + IP OAM for fault management
Multi-site connectivity
Simpler to add new location to an E-LAN service (auto learning)
In many cases, simpler to deploy L2 multipoint services

17. Summary
Ethernet Service are agnostic of the Access or Transport Network Technology
Facilitates a common service portfolio for all markets
Ethernet Service can be:
A Layer 2 Connectivity Service (E-Line or E-LAN L2 VPN)
A Layer 1 Private Line Replacement (EPL)
A Layer 2 access connection to an IP Service
Ethernet Access to Internet
Managed IP VPN or VoIP service

18. Presentation available for download at: http://MetroEthernetForum