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Ethernet Access Services Definition and Implementation

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Co-presented by:

Ralph SantitoroDirector of Carrier Ethernet Solutions

Ralph@Marcom-Services.net

Arie GoldbergOmnitron CEO and Founder

MEF Board Memberagoldberg@omnitron-systems.com

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Ethernet over SDH (EoS)Ethernet over

PON/WDM

Ethernet Service Delivery over Different Access Network Technologies

EoDSL10/100BaseT

Co

ax

Ether

net

over H

FC

10/100BaseT

Ethernet over Fiber (EoF)

Ethernet over

PDH (EoPDH)10/100BaseT

10/100BaseT

Ethernet can be delivered over many different Ethernet can be delivered over many different types of access network technologiestypes of access network technologies

10/100BaseT

Ethernet Ethernet Service Service ProviderProvider

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Fundamental Ethernet Service Components

• 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

E-NNI I-NNI

These Ethernet Service components are independent of the These Ethernet Service components are independent of the Access or Transport Network Technology to delivery the serviceAccess or Transport Network Technology to delivery the service

Access/Aggregation Access/Aggregation

NetworkNetwork

E-NNI Metro Transport / Metro Transport /

Core NetworkCore Network

Access/Aggregation Access/Aggregation

NetworkNetwork

UNI UNI

EVCEVC

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Example of Ethernet Service Delivery over Different Access/Transport Technologies

E-NNI

10Mbps EVC10Mbps EVC

I-NNI

Subscriber is unaware of the various transport network Subscriber is unaware of the various transport network technologies used to deliver this 10Mbps Ethernet Servicetechnologies used to deliver this 10Mbps Ethernet Service

PDH (E1/T1) Access PDH (E1/T1) Access

Network ProviderNetwork Provider

E-NNIMPLS Transport MPLS Transport

NetworkNetwork

Fiber Access Fiber Access

NetworkNetwork

UNI2

PDH Access Network• EoPDH: N bonded E1sEoPDH: N bonded E1s

Fiber Access Network• Ethernet over Fiber (EoF)Ethernet over Fiber (EoF)

MPLS Transport Network• Ethernet over MPLSEthernet over MPLS

• 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)

Ethernet Ethernet Service ProviderService Provider

UNI1

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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

Ethernet Service: Layer 2 Service End-to-EndEthernet Service: Layer 2 Service End-to-EndEthernet Access to IP Service: Layer 2 access to IP ServiceEthernet Access to IP Service: Layer 2 access to IP Service

E-LANE-LAN

E-LineE-Line

InternetInternet

VoIPVoIP

E-LineE-Line

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Comparison of Ethernet L2 VPN and IP VPN Services in Access Network

Fundamental difference between Ethernet and IP Services in the access Fundamental difference between Ethernet and IP Services in the access network is the information used to identify, forward and process service frames network is the information used to identify, forward and process service frames

Ethernet L2 VPN Service• UNIUNI• EVC (service) identified via VLAN IDEVC (service) identified via VLAN ID• CoS identified via PCPCoS identified via PCP• Forwarding on MAC or VLAN IDForwarding on MAC or VLAN ID

IP VPN Service• PortPort• Service identified via IP addressService identified via IP address• CoS identified via DSCPCoS identified via DSCP• Forwarding on IP AddressForwarding on IP Address

Service Service AttributeAttribute Ethernet ServiceEthernet Service IP ServiceIP Service

Customer Handoff Ethernet UNI Ethernet port (or PDH circuit)Service Identification VLAN ID / EVC IP AddressCoS Identification PCP DSCP/ToS

Packet/Frame Routing/Forwarding

MAC Address (E-LAN)VLAN ID (E-Line)

IP Address

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,

Service Service ProviderProvider

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Ethernet Access Service Attributes

Ethernet Service Performance Metrics, Bandwidth Profiles, CoS, Service

Performance, and Fault Management

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Ethernet Service Performance Management

• Key Metrics1. Frame/Packet Delay (Latency)2. Frame/Packet Delay Variation (Jitter)3. Frame/Packet Loss Ratio4. Service Availability5. 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 The combination of IEEE 802.1ag, ITU-T Y.1731 and MEF 10.1 define Ethernet service performanceand MEF 10.1 define Ethernet service performance

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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)

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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-1

CIR

EIREVC-2

CIR

EIR

EVC-3

CIR

EIR

UNIEVC 1

CoS 61Mbps CIR for VoIP

CoS 26Mbps CIR for VPN data traffic

3Mbps for Internet AccessEVC 2

10Mbps UNI

(port)

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

CIR defines the assured bandwidth CIR defines the assured bandwidth EIR improves the network’s Goodput EIR improves the network’s Goodput

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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 Connectivity Fault Management provided by Carrier Ethernet network elements and NIDs Carrier Ethernet network elements and NIDs

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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 Ethernet Link Fault Management performed by Carrier Ethernet network elements and NIDsCarrier Ethernet network elements and NIDs

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Access Access NetworkNetwork

Metro Metro AggregationAggregation

NetworkNetwork Access Access NetworkNetwork

IP/MPLS CoreIP/MPLS CoreNetworkNetwork Metro Metro

Aggregation Aggregation NetworkNetwork

Maintenance Association (MA)

MEP#1 MEP #2

MIPMIP

Ethernet Service Continuity Check

MEP #1No CCMs received from MEP #2 within 30ms (3 x 10ms) MEP #2

Report on CC fault if no CCMs are received from MEP #1 for 30ms

MEP #1Send CCMs with RDI flag set

MEP #2Remote alarm detected by received RDI Report alarm to management system

MEP #2Initiate protection switchover

MEP #1CCMs sent every 10ms on working/protect paths Check for CCMs received from MEP #2 on working/protect paths

MIP MIPMIPMIP

UNIUNI

MEP #2CCMs sent every 10ms Check for CCMs received from MEP #1

MEP #1Report CC fault to management system

Ethernet continuity check is analogous to IP’s Ping but does much Ethernet continuity check is analogous to IP’s Ping but does much more more

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Ethernet Link Trace

Access Access NetworkNetwork

Metro Metro AggregationAggregation

NetworkNetworkAccess Access NetworkNetwork

IP/MPLS CoreIP/MPLS CoreNetworkNetwork Metro

Aggregation Network

MEP MEPMIPMIP MIPMIP

Link trace Reply

UNIUNI

Ethernet Link Trace is analogous to IP’s TracerouteEthernet Link Trace is analogous to IP’s Traceroute

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Some Benefits of Ethernet L2 VPN versus IP VPN

L2 VPN Service L2 VPN Service BenefitBenefit Enterprise BenefitsEnterprise Benefits Service Provider Service Provider

BenefitsBenefits

• 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

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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

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Presentation available for download at: http://MetroEthernetForum.org/Presentations