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… what buyers need to understand … what providers need to communicate
Ralph SantitoroCo-chair, MEF Technical Marketing Committee
Metro Ethernet Services
Metro Ethernet Services Overview v1.22
Contents
• Ethernet as a Service• Ethernet Service Benefits• MEF Phase I Service Documents• Defining an Ethernet Service• Example E-Line and E-LAN Services• Ethernet SLAs• Ethernet Service Summary• References and Resources
Metro Ethernet Services Overview v1.23
Ethernet as a Service
• Ethernet’s origins in the Enterprise– Used as a LAN connectivity technology– Just plug it in and start using it
• Ethernet’s new usage as a Service– Requires “service attributes” like other MAN / WAN
services• Ethernet UNI, Ethernet “VC”, Service Performance, etc.
Same Ethernet technology just used in a new waySame Ethernet technology just used in a new way
Metro Ethernet Services Overview v1.24
Ethernet Service Benefits
• Ease of use– Widely available, well understood technology– Simplifies network operations (OAM&P)
• Cost Effectiveness– Widespread use of Ethernet interface– Purchase bandwidth only when needed
• Flexibility– Single UNI can connect to multiple services
• Internet, VPN, Extranet supplier, Storage Provider
– Bandwidth can be added in 1Mbps increments
Metro Ethernet Services Overview v1.25
Let’s look at TDM and other L2 Services
Inflexible Bandwidth Scalability• Increasing non-Ethernet service
bandwidth often requires:– New service (step function)
• T1T3, FRATM
– New hardware• new interface or equipment
– 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 Service dictates bandwidth increments
and technology
Frame Relay
POS
ATM
Metro Ethernet Services Overview v1.26
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 growing bandwidth needs
OC-48
OC-12
OC-3
T3
T1
1.5M 45M 155M 622M 2.4G
Ethernet provides flexible bandwidth increments using
same technology
Frame Relay
POS
ATM
1GbE
10/100MbE
1 Source: Network Strategy Partners, LLC
Ethernet
Metro Ethernet Services Overview v1.27
MEF Phase I Service Documents
• Phase I consists of 3 technical specifications– Ethernet Services Model (ESM - MEF 1.0 standard)
• Defines Ethernet service building blocks (service attributes)• Defines a framework describing how to build an Ethernet service
– does not define Ethernet services
– Ethernet Services Definitions (ESD)• Defines how to apply the ESM building blocks to create services• Defines Ethernet Line (E-Line) and Ethernet LAN (E-LAN)
service types and instances of them (EPL, EVPL, EIA, etc.)
– Ethernet Traffic Management (ETM)• Defines traffic management and service performance
requirements to create CoS-based SLAs
Metro Ethernet Services Overview v1.28
Relationship between MEF Phase I Service documents
MEF 1.0 - Ethernet Service Model (ESM)
(Ratified Sept. 2003)
Ethernet Service Definitions (ESD)
Ethernet Traffic Management (ETM)
Metro Ethernet Services Overview v1.29
Ethernet Services Model (ESM)
• Ratified by MEF Tech. Committee - Sept. 2003– into Technical Specification MEF 1.0
• Defines building blocks for creating services• Building blocks consist of Ethernet Service
Attributes and Parameters defined for:– Ethernet UNI (User Network Interface)– Ethernet Virtual Circuit (EVC)
MEF 1.0 defines the building blocks to create servicesMEF 1.0 defines the building blocks to create services
Metro Ethernet Services Overview v1.210
How the MEF defines an Ethernet Service• MEF 1.0 defines the Ethernet Service Definition
Framework • A service is defined via
– Service Type– Service Attributes– Service Attribute Parameters
Defined in Defined in ESDESD
Defined in ESM Defined in ESM (MEF 1.0) and (MEF 1.0) and
ETMETM Defined in ESM Defined in ESM (MEF 1.0) and (MEF 1.0) and
ETMETM
Metro Ethernet Services Overview v1.211
Ethernet Service – Basic Model defined in MEF 1.0
• 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 service
delivery technologies• SONET/SDH, WDM, RPR, MAC-in-MAC,
Q-in-Q, MPLS
CE
CE
CE
UNI
Metro Metro Ethernet Ethernet Network Network (MEN)(MEN)
UNI
Metro Ethernet Services Overview v1.212
Ethernet Service Type defined in ESD
• Ethernet Service Type– Generic Ethernet connectivity service construct
• Each Ethernet Service Type– has a set of Ethernet Service Attributes
• MEF has defined 2 Ethernet Service Types– Ethernet Line (E-Line) Service
• Provides Point-to-Point connectivity– Ethernet LAN (E-LAN) Service
• Provides Multipoint-to-Multipoint (Any-to-Any) connectivity
Service Types are generic Service Types are generic constructs used to create servicesconstructs used to create services
Metro Ethernet Services Overview v1.213
UNIMEN
UNI
Point-to-Point EVC
Ethernet Virtual Connection (EVC) defined in MEF 1.0
• 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
EVCs help conceptualize the service connectivityEVCs help conceptualize the service connectivity
MEN
Multipoint-to-Multipoint EVC
Metro Ethernet Services Overview v1.214
Ethernet Service Attributes defined in MEF 1.0, ESD and ETM
• Service Attributes define – the capabilities of the Ethernet Service Type
• Service Attributes defined for UNI and EVC:– Physical Interface– Bandwidth Profiles– Service Performance – Service Frame Delivery– Service Multiplexing– Etc….
Service Attributes define the service characteristicsService Attributes define the service characteristics
UNI and EVC Service Attribute Details
Service Attributes defined in MEF 1.0 Technical Specification
Metro Ethernet Services Overview v1.216
EVC Service AttributesService AttributeService Attribute Service Attribute ParametersService Attribute Parameters
EVC Type Point-to-Point or Multipoint-to-Multipoint
UNI ListA list of UNIs (identified via the UNI Identifier service attribute) used with the EVC
CE-VLAN ID Preservation
Yes or No. Specifies whether customer VLAN ID is preserved or not.
CE-VLAN CoS Preservation
Yes or No. Specifies whether customer VLAN CoS (802.1p) is preserved or not.
Unicast Service Frame Delivery
Specifies whether unicast frames are Discarded, Delivered Unconditionally or Delivered Conditionally
Multicast Service Frame Delivery
Specifies whether multicast frames are Discarded, Delivered Unconditionally or Delivered Conditionally
Broadcast Service Frame Delivery
Specifies whether broadcast frames are Discarded, Delivered Unconditionally or Delivered Conditionally
Layer 2 Control Protocol Processing
Discard or Tunnel per protocol
Service PerformanceSpecifies the Frame Delay, Frame Jitter and Frame Loss per EVC or frames within an EVC identified via their CE-VLAN CoS (802.1p) value
Metro Ethernet Services Overview v1.217
UNI Service AttributesService AttributeService Attribute Service Attribute ParametersService Attribute Parameters
UNI Identifier A string used to identity of a UNI, e.g., NYCBldg12Rm102Slot22Port3
Physical Medium Standard Ethernet PHY
Speed 10 Mbps, 100 Mbps, 1 Gbps or 10 Gbps
Mode Full Duplex or Auto negotiation
MAC Layer IEEE 802.3-2002
Service Multiplexing Yes or No. Defines whether multiple services can be on the UNI
UNI EVC ID A string used identify an EVC, e.g., NYCBldg1Rm102Slot22Port3EVC3
CE-VLAN ID / EVC Map Mapping table of customer VLAN IDs to EVC
Max. Number of EVCs The maximum number of EVCs allowed per UNI
BundlingNo or Yes. Specifies that one or more customer VLAN IDs are mapped to an EVC at the UNI
All to One Bundling No or Yes (all customer VLAN IDs are mapped to an EVC at the UNI).
Ingress Bandwidth Profile Per Ingress UNI
None or <CIR, CBS, EIR, EBS>. This Bandwidth profile applies to all frames across the UNI.
Ingress Bandwidth Profile Per EVC
None or <CIR, CBS, EIR, EBS>. This Bandwidth profile applies to all frames over particular EVC.
Ingress Bandwidth Profile Per CoS ID
None or <CIR, CBS, EIR, EBS>. This Bandwidth profile applies to all frames marked with a particular CoS ID over an EVC.
Layer 2 Control Protocol Processing
Discard, Peer or Pass to EVC per protocol
Metro Ethernet Services Overview v1.218
E-Line and E-LAN Service Types defined in ESD
• E-Line Service used to create– Private Line Services– Ethernet Internet Access– Point-to-Point VPNs
• E-LAN Service used to create– Multipoint VPNs– Transparent LAN Service
CE
CE
Point-to-Point EVC
MENUNI
UNI
E-Line Service type
CE
CE
CE
MEN
CE
Multipoint-to-Multipoint EVC
UNI
UNI
UNI
UNI
E-LAN Service type
Metro Ethernet Services Overview v1.219
Example Service using E-Line Service Type
• Ethernet Virtual Private Line– Supports Service Multiplexed UNI– Point-to-Point VPN for site interconnectivity
CECE
MEN
Ethernet UNI
Ethernet UNIService
Multiplexed Ethernet
UNI
Point-to-Point EVCs
CE FR CPE
FR CPE
MEN
FR UNI
FR UNI
FR UNI
Point-to-Point FR PVCs
Ethernet Virtual Private Line using E-Line Service type
Frame Relay Analogy to E-Line Service
FR CPE
Metro Ethernet Services Overview v1.220
Example Service using E-Line Service Type
• Ethernet Private Line– Dedicated UNIs for Point-to-Point connections
MEN
Ethernet UNI
Ethernet UNI
Ethernet UNI
Point-to-Point EVCs (dedicated BW)
CE
Ethernet Private Line using E-Line Service type
Private Line Analogy to E-Line Service
Internet
ISPPOP
Storage SP
Ethernet UNI
MEN
OC-3
OC-3
DS1
Dedicated TDM circuits
CE
Internet
ISPPOP
Storage SP
DS3CE
CE
CE
CE
Metro Ethernet Services Overview v1.221
Example Service using E-LAN Service Type
• Transparent LAN Service (TLS) provides– Intra-company Connectivity
– Full transparency of control protocols (BPDUs)
• New VLANs added– without coordination with
provider
Multipoint-to-Multipoint EVCUNI 1
UNI 3
UNI 4
UNI 2
MENVLANs
Engineering
VLANsSales
Customer ServiceEngineering
VLANsSales
VLANsSales
Customer Service
TLS makes the MEN TLS makes the MEN look like a LANlook like a LAN
Transparent LAN Service
Metro Ethernet Services Overview v1.222
Ethernet SLAs• Many Enterprise customers will not use
Metro Ethernet services unless: – There are SLAs with performance assurances– There is availability of service to all critical locations
• Such enterprises will build private networks• Critical SLA Service Attributes
– Bandwidth Profile– Service Performance
Enterprise customers require CoS-based SLAs Enterprise customers require CoS-based SLAs with service performance assuranceswith service performance assurances
Metro Ethernet Services Overview v1.223
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, EIR, EBS>
– CIR/CBS determines frame delivery per service level objectives
– EIR/EBS determines amount of excess frame delivery allowed
Metro Ethernet Services Overview v1.224
Three Types of Bandwidth Profiles defined in ETM
UNI
EVC 1
EVC 2
EVC 3
Ingress Bandwidth Profile Per Ingress UNI UNI
EVC 1
EVC 2
EVC 3
Ingress Bandwidth Profile Per EVC1
Ingress Bandwidth Profile Per EVC2
Ingress Bandwidth Profile Per EVC3
UNI EVC 1
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 4Ingress Bandwidth Profile Per CoS ID 2
EVC 2
Metro Ethernet Services Overview v1.225
Service Performance (QoS) defined in ETM
• Service Performance Parameters– Availability– Frame Delay– Frame Jitter– Frame Loss
• Service performance level to delivery determined via: – Per CoS ID, e.g., 802.1p user priority per EVC– Per UNI (port), i.e., 1 CoS for all EVCs at UNI
Metro Ethernet Services Overview v1.226
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
Service Service ClassClass Service CharacteristicsService Characteristics CoS IDCoS ID Bandwidth Profile Bandwidth Profile
per EVC per CoS IDper EVC per CoS IDService Service
PerformancePerformance
Premium Real-time IP telephony or IP video applications 6, 7 CIR > 0
EIR = 0
Delay < 5msJitter < 1ms
Loss < 0.01%
SilverBursty mission critical data applications requiring low loss and delay (e.g., Storage)
4, 5 CIR > 0EIR ≤ UNI Speed
Delay < 5msJitter = N/S
Loss < 0.01%
BronzeBursty data applications requiring bandwidth assurances
3, 4 CIR > 0EIR ≤ UNI Speed
Delay < 15msJitter = N/S
Loss < 0.1%
Standard Best effort service 0, 1, 2 CIR=0 EIR=UNI speed
Delay < 30msJitter = N/S
Loss < 0.5%
Metro Ethernet Services Overview v1.227
E-Line and E-LANE-Line and E-LAN(Virtual and Private)(Virtual and Private)
Enabled Enabled Service over Service over
EthernetEthernetStorageStorage Video on Video on
DemandDemandInternet Internet AccessAccess
Service Service Delivery Delivery
TechnologyTechnologyEthernet Ethernet
over Fiberover Fiber
Ethernet Ethernet over over
SONET/SDHSONET/SDHEthernet Ethernet over RPRover RPR
Ethernet Ethernet over MPLSover MPLS
Ethernet Ethernet over WDMover WDM
Ethernet Ethernet Connectivity Connectivity
ServiceService
IP VPNIP VPN IP IP TelephonyTelephony
Summary of Metro Ethernet Services
Metro Ethernet Services Overview v1.228
Summary• Ethernet Services
– Same Ethernet… just used in new way
• E-Line and E-LAN Service types create– broad range of point-to-point and multipoint services
• Ethernet Services Framework– Defines service attributes that define the service
characteristics
• Ethernet Services need CoS-based SLAs– to increase Enterprise usage for mission critical apps
Metro Ethernet Services Overview v1.229
References and Resources• Metro Ethernet Services – A Technical Overview
– http://www.metroethernetforum.org/metro-ethernet-services.pdf
• Bandwidth Profiles for Ethernet Services– http://www.metroethernetforum.org/PDFs/WhitePapers/Bandwidth-Profiles-for-
Ethernet-Services.pdf
• MEF 1.0 “Ethernet Service Model, Phase 1”– http://www.metroethernetforum.org/PDFs/Standards/MEF-1.0.doc
• Metro Ethernet Services for Enterprises– http://www.metroethernetforum.org/businesscase_wp_092702f.pdf
• Business Case for Enterprise Metro Ethernet– http://www.metroethernetforum.org/presentations/Supercomm2003-Metro-
Ethernet-Business-Case21.ppt
• Metro Ethernet Networks - A Technical Overview– http://www.metroethernetforum.org/PDFs/WhitePapers/
meftechoverviewwhitepaper102903.pdf