03- Metro Ethernet

7/30/2019 03- Metro Ethernet

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Captulo 3Metro Ethernet

Ing. Giuseppe Blacio Abad


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Lets look at TDM and other L2 Services

Inflexible Bandwidth Scalability

Increasing non-Ethernet service

bandwidth often requires:

New service (step function) T1T3, FRATM

New service provisioning

different protocols / technologies

Often resulting in: Oversubscribing to meet growing

bandwidth needs

OC-48

OC-12

OC-3

T3

T1

1.5M 45M 155M 622M 2.4G

TDM hierarchy or L2 Servicedictates bandwidth incrementsand technology

Frame Relay

SDH

ATM


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Ethernet Service Benefits over TDM/other L2 Services

Flexible Bandwidth Scalability

Increasing Ethernet service bandwidth:

Requires just bandwidth provisioning

Provision only amount of BW needed

Same protocol for LAN and MAN

Lower OpEx & CapEx with Ethernet

25-40% lower cost than

TDM, Frame Relay, ATM interfaces1

10x lower cost

than high speed SONET interfaces1

Easier and less costly to meet growingbandwidth needs

OC-48

OC-12

OC-3

T3

T1

1.5M 45M 155M 622M 2.4G

Ethernet provides flexiblebandwidth increments usingsame technology

Frame Relay

SDH

ATM

1GbE

10/100MbE

Ethernet


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The Beginning: Metro Ethernet

The Metro Ethernet Forum (MEF) was formed in

2001 in order to develop ubiquitous business

services for Enterprise users principally accessed

over optical metropolitan networks in order toconnect their Enterprise LANs. The principal

concept was to bring the simplicity and cost model

of Ethernet to the wide area network.


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Expansion to Carrier Ethernet

The success of Metro Ethernet Services caught the

imagination of the world when the concept

expanded to include worldwide services

traversing national and global networks Access networks to provide availability to a much

wider class of user over fiber, copper, cable,

passive optical network (PON), and wireless

All while retaining the cost model and simplicity

of Ethernet


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Carrier Ethernet

The MEF has defined Carrier Ethernet as

A ubiquitous, standardized, carrier-class Service and

Network defined by five attributes that distinguish it from

familiar LAN based Ethernet


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Carrier Ethernet Defined

Carrier Ethernet services are carried over physicalEthernet networks and other legacy transporttechnologies


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MEN Architectural Components


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MEF Services Definition Framework

Service Type

Construct used to create broad range of services

Service Attributes

Defines characteristics of a service type

Attribute Parameters Set of parameters with various options


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Service Types

E-Line Point-to-point Ethernet Virtual Circuit

(EVC)

E-LAN Multipoint-to-multipoint Ethernet

Virtual Circuit

EVC1

EVC2


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Service Attributes

Physical Interface Medium, speed, mode, MAC layer

Traffic Parameters

CIR, CBS, EIR, EBS

QoS Parameters

Availability, delay, jitter, loss

Service Multiplexing

Multiple instances of EVCs on a given physical I/F

Bundling

Multiple VLAN IDs (VID) mapped to single EVC at UNI


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Service Types and Ethernet Services

Service Types

E-Line

(p2p connectivity)E-LAN

(mp2mp connectivity)

Ethernet Private

Line (E-line)

Ethernet Virtual

Private Line (E-VPL)Ethernet Private

LAN (E-LAN)

Ethernet Virtual Private

LAN (E-VPLAN)

Ethernet Services


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MEF Carrier Ethernet Terminology


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Carrier Ethernet

Network

UNI

The User Network Interface (UNI)

The UNI is the physical interface or port that is the demarcationbetween the customer and the service provider/Cable

Operator/Carrier/MSO

The UNI is always provided by the Service Provider

The UNI in a Carrier Ethernet Network is a physical EthernetInterface at operating speeds 10Mbs, 100Mbps, 1Gbps or

10Gbps

CE: Customer Equipment UNI: User Network Interface.

CE


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Carrier Ethernet Architecture

Service Provider 1

CE

Customer

Site

ETH

UNI-C

CE

I-NNI

Service Provider 2

I-NNI

Customer

Site

ETH

UNI-N

ETH

ENNI-N

ETH

ENNI-N

ETH

UNI-C

ETH

UNI-N

UNI ENNI UNI

UNI

UNI-C

UNI-N

User Network Interface

UNI-customer side

UNI-network side

NNI

ENNI

I-NNI

Network to Network Interface

External NNI

Internal NNI

The UNI is the physical demarcation point between the responsibility

of the Service Provider and the responsibility of the Subscriber.


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UNIMENUNI

Point-to-Point EVC

Ethernet Virtual Connection (EVC)

An EVC is an instance of an association of 2 or more UNIs

EVCs help visualize the Ethernet connections Like Frame Relay and ATM PVCs

MEF has defined 2 EVC types

Point-to-Point Multipoint-to-Multipoint

Can be bundled or multiplexed on the same UNI

MEN

Multipoint-to-Multipoint EVC


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Ethernet ServiceBasic Model

Customer Equipment (CE) attaches to UNI

CE can be

router

IEEE 802.1Q bridge (switch)

UNI (User Network Interface)

Standard IEEE 802.3 Ethernet PHY and MAC

10Mbps, 100Mbps, 1Gbps or 10Gbps

Metro Ethernet Network (MEN)

May use different transport and servicedelivery technologies

SONET/SDH, WDM, MPLS

CE

CE

CE

UNI

MetroEthernetNetwork(MEN)

UNI


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Service Types


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Service Types

E-Line Service used to

create

Ethernet Private Lines

Virtual Private Lines

Ethernet Internet Access

Point-to-Point VPNs

E-LAN Service used tocreate

Multipoint L2 VPNs

Transparent LAN Service

Foundation for IPTV and

Multicast networks etc.

CE

CE

Point-to-PointEVC

MENUNI

UNI

E-Line Service type

CE

CE

CE

MEN

CE

Multipoint-to-MultipointEVC

UNI

UNI

UNI

UNI

E-LAN Service type


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EVCs and Services

In a Carrier Ethernet network, data is transported

across Point-to-Point and Multipoint-to-Multipoint EVCs

according to the attributes and definitions of the E-Line

and E-LAN services

Point-to-Point EVC

Carrier EthernetNetwork

UNI UNI


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Services Using E-Line Service Type

Ethernet Private Line (EPL)

Replaces a TDM Private line

Dedicated UNIs for Point-to-Point connections

Single Ethernet Virtual Connection (EVC) per UNI

The most popular Ethernet service due to its simplicity

Point-to-Point EVC

Carrier EthernetNetwork

CE UNI

CE

UNI

CE

UNI

ISP

POP

UNI

Storage Service

Provider

Internet


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Service using E-Line Service Type

Ethernet Private Line

Dedicated UNIs for Point-to-Point connections

MEN

EthernetUNI

EthernetUNI

EthernetUNI

Point-to-Point EVCs

(dedicated BW)

CE

Ethernet Private Lineusing E-Line Service type

Private Line Analogy toE-Line Service

Internet

ISPPOP

Storage SP

EthernetUNI

MEN

OC-3

OC-3

DS1

Dedicated TDM

circuits

CE

Internet

ISPPOP

Storage SP

DS3

CE

CE

CE

CE


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Services Using E-Line Service Type

Ethernet Virtual Private Line (EVPL) Replaces Frame Relay or ATM services

Supports Service Multiplexed UNI

(i.e. multiple EVCs per UNI)

Allows single physical connection (UNI) to customer

premise equipment for multiple virtual connections


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Service using E-Line Service Type

Ethernet Virtual Private Line Supports Service Multiplexed UNI

Point-to-Point VPN for site interconnectivity

CE

CE

MEN

EthernetUNI

EthernetUNI

ServiceMultiplexedEthernetUNI

Point-to-Point

EVCs

CE FR CPE

FRCPE

MEN

FRUNI

FRUNI

FRUNI

Point-to-PointFR PVCs

Ethernet Virtual Private Lineusing E-Line Service type

Frame Relay Analogyto E-Line Service

FR CPE


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Service using E-LAN Service Type

Transparent LAN Service (TLS)

provides

Intra-company Connectivity

Full transparency of control protocols New VLANs added

without coordination with provider

Multipoint-to-Multipoint EVC

UNI 1

UNI3

UNI 4

UNI2

MENVLANsEngineerin

VLANsSalesCustomer ServiceEngineering

VLANsSales

VLANs

SalesCustomer Service

TLS makes the MENlook like a LAN

Transparent LAN Service


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MEF 6.1 Ethernet Services Definitions Phase 2

Service TypePort-Based

(All-to-One Bundling)

VLAN-Based

(Service Multiplexed)

E-Line

(Point-to-Point EVC)

Ethernet Private Line

(EPL)

Ethernet Virtual Private Line

(EVPL)

E-LAN

(multipoint-to-multipoint

EVC)

Ethernet Private LAN

(EP-LAN)

Ethernet Virtual Private LAN

(EVP-LAN)

E-Tree

(rooted multipoint EVC)

Ethernet Private Tree

(EP-Tree)

Ethernet Virtual Private Tree

(EVP-Tree)

S i U i E T S i T


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Services Using E-Tree Service Type

Ethernet Private Tree (EP-Tree) and Ethernet VirtualPrivate Tree (EVP-Tree) Services Provides traffic separation between users with traffic from one

leaf being allowed to arrive at one of more Roots but never

being transmitted to other leaves Targeted at multi-host and where user traffic must be kept

invisible to other users Anticipated to be an enabler for mobile backhaul

and triple-play infrastructure rather

than end-user SLAs

Root

Carrier Ethernet Network

CE

UNI

UNI

UNI

CE

UNI

CE

Leaf

Leaf

UNI

CE

Leaf


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Carrier Ethernet Architecture (1)

DataPlane

Con

trolPlane

M

anagementPlane

Transport Services Layer(e.g., IEEE 802.1, SONET/SDH, MPLS)

Ethernet Services Layer(Ethernet Service PDU)

Application Services Layer(e.g., IP, MPLS, PDH, etc.)

APP Layer

ETH Layer

TRAN Layer

Data moves from UNI to UNI across "the network" with a layered

architecture.


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Bandwidth Profiles defined in ETM

MEF has defined three bandwidth profiles

Ingress Bandwidth Profile Per Ingress UNI

Ingress Bandwidth Profile Per EVC

Ingress Bandwidth Profile Per CoS ID

4 parameters

CIR/CBS determines frame delivery per service level objectives

EIR/EBS determines amount of excess frame delivery allowed


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Bandwidth Profiles defined in ETM

CIR (Commited Information Rate)

CBS (Commited Burst Size)

EIR (Excess Information Rate)

EBS (Excess Burst Size)


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CIR and EIR Bandwidth Profiles

CIRCommitted Information Rate

Frame delivery obligation per

SLA

EIRExcess Information Rate Excess frame delivery allowed

not subject to SLA if

available

CBS, EBS - size of burst window (ms)

for allowed CIR / EIR ratesTotal UNI BW

EVC1 EVC2

EVC3

EIR


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Three Types of Bandwidth Profiles

UNI

EVC1

EVC2

EVC3

Ingress BandwidthProfile Per Ingress UNI

UNI

EVC1

EVC2

EVC3

Ingress BandwidthProfile Per EVC1Ingress BandwidthProfile Per EVC2

Ingress BandwidthProfile Per EVC3

UNI EVC1

CE-VLAN CoS 6 Ingress Bandwidth Profile Per CoS ID 6

CE-VLAN CoS 4

CE-VLAN CoS 2

Ingress Bandwidth Profile Per CoS ID 4

Ingress Bandwidth Profile Per CoS ID 2

EVC2


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Service Performance (QoS)

Service Performance Parameters Availability

Frame Delay Frame Jitter

Frame Loss

Service performance level to delivery determinedvia: Per CoS ID, e.g., 802.1p user priority per EVC Per UNI (port), i.e., 1 CoS for all EVCs at UNI


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Example CoS-based Metro Ethernet SLA

E-Line Service

4 Classes of Service

CoS determined via 802.1p CoS ID

Common type of SLA used with CoS-based IP VPNs

ServiceClass Service Characteristics CoS ID

Bandwidth Profileper EVC per CoS ID

ServicePerformance

Premium Real-time IP telephony or IPvideo applications

6, 7CIR > 0EIR = 0

Delay < 5msJitter < 1ms

Loss < 0.01%

SilverBursty mission critical dataapplications requiring lowloss and delay (e.g., Storage)

4, 5 CIR > 0EIR UNI Speed

Delay < 5ms

Jitter = N/SLoss < 0.01%

BronzeBursty data applicationsrequiring bandwidthassurances

3, 4CIR > 0EIR UNI Speed

Delay < 15msJitter = N/SLoss < 0.1%

Standard Best effort service 0, 1, 2CIR=0

EIR=UNI speed

Delay < 30msJitter = N/SLoss < 0 5%

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03- Metro Ethernet