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%