iir ethernet access services definition implementation

7/28/2019 IIR Ethernet Access Services Definition Implementation

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Ethernet Access Services

Definition and Implementation


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Co-presented by:

Ralph SantitoroDirector of Carrier Ethernet Solutions

[email protected]

Arie GoldbergOmnitron CEO and Founder

MEF Board Member

[email protected]


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Ethernet over

SDH (EoS)

Ethernet Service Delivery over Different Access NetworkTechnologies

10/100BaseT

10/100BaseT

Ethernet over

Fiber (EoF)

10/100BaseT

10/100BaseT

Ethernet can be delivered over many differenttypes of access network technologies

10/100BaseT

EthernetService

Provider


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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 associatebetween 2 or more UNIs

E-NNI I-NNI

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

Access/Aggregation

Network

E-NNI Metro Transport /

Core Network

Access/Aggregation

Network

UNI UNI

EVC


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Example of Ethernet Service Delivery over DifferentAccess/Transport Technologies

E-NNI

10Mbps EVC

I-NNI

Subscriber is unaware of the various transport networktechnologies used to deliver this 10Mbps Ethernet Service

PDH (E1/T1) Access

Network Provider

E-NNIMPLS Transport

Network

Fiber Access

Network

UNI2

PDH Access Network EoPDH: N bonded E1s

Fiber Access Network Ethernet over Fiber (EoF)

MPLS Transport Network Ethernet 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)

EthernetService 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 ServiceNetworks

Ethernet access to Internet Ethernet access to Managed VoIP service

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

E-LAN

E-Line

Internet

VoIP

E-Line


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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 Metrics

1. Frame/Packet Delay (Latency)2. Frame/Packet Delay Variation (Jitter)

3. Frame/Packet Loss Ratio

4. Service Availability

5. 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.1731and 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 ofa 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 TrafficEngineering

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 EVC-2

EVC-3

EIR

UNIEVC

1

CoS 61Mbps CIRfor VoIP

CoS 2

6Mbps CIR

for VPNdata traffic

3Mbps forInternet Access

EVC2

10MbpsUNI

(port)

BWPs can divide bandwidth perEVC (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 bandwidthEIR improves the networks 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 byCarrier 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 byCarrier Ethernet network elements and NIDs


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AccessNetwork

MetroAggregation

Network AccessNetwork

IP/MPLS CoreNetwork Metro

AggregationNetwork

Maintenance Association (MA)

MEP#1 MEP #2

MIPMIP

Ethernet Service Continuity Check

MEP #1

No CCMs

received from

MEP #2 within

30ms (3 x 10ms) MEP #2Report on CC fault

if no CCMs are

received from MEP

#1 for 30ms

MEP #1

Send CCMs with RDI

flag set

MEP #2Remote alarm detected

by received RDI

Report alarm to

management system

MEP #2

Initiate

protection

switchover

MEP #1

CCMs sent every 10ms on

working/protect paths

Check for CCMs received

from MEP #2 on

working/protect paths

MIP MIPMIPMIP

UNIUNI

MEP #2

CCMs sent every 10ms

Check for CCMs

received from MEP #1

MEP #1

Report CC fault to

management

system

Ethernet continuity check is analogous to IPs Ping but does much more


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Ethernet Link Trace

AccessNetwork

MetroAggregation

NetworkAccessNetwork

IP/MPLS CoreNetwork Metro

AggregationNetwork

MEP MEPMIPMIP MIPMIP

Link trace Reply

UNIUNI

Ethernet Link Trace is analogous to IPs Traceroute


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Some Benefits of Ethernet L2 VPN versus IP VPN

L2 VPN Service

BenefitEnterprise Benefits

Service Provider

Benefits No IP awareness

required

Especially

important with

IPv6 applications

No service provider

coordination of IP

addresses

No concerns of service

providers IPv6capabilities

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

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