… what buyers need to understand … what providers need to communicate Metro Ethernet Services … what buyers need to understand … what providers need to communicate About the author: Ralph Santitoro has taken a leadership role in defining Ethernet services in the Metro Ethernet Forum’s (MEF) Technical Committee and has actively participated in the MEF since December 2001. Mr. Santitoro is also editor of the MEF’s Ethernet Services Definitions, Traffic Management and QoS Framework technical specifications and co-chairs the MEF’s Technical Marketing and Web Presence Committee. Ralph Santitoro Co-chair, MEF Technical Marketing Committee rsantito@nortelnetworks.com

Metro Ethernet Services Overview v1.2 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 v1.2

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 way Metro Ethernet Services Overview v1.2

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 v1.2

Let’s look at TDM and other L2 Services TDM hierarchy or L2 Service dictates bandwidth increments and technology Inflexible Bandwidth Scalability Increasing non-Ethernet service bandwidth often requires: New service (step function) T1T3, FRATM 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 POS ATM Frame Relay 1.5M 45M 155M 622M 2.4G Metro Ethernet Services Overview v1.2

Ethernet Service Benefits over TDM/other L2 Services Ethernet provides flexible bandwidth increments using same technology 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 1GbE 10/100MbE POS ATM Ethernet Frame Relay 1.5M 45M 155M 622M 2.4G 1 Source: Network Strategy Partners, LLC Metro Ethernet Services Overview v1.2

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 v1.2

Relationship between MEF Phase I Service documents Ethernet Service Definitions (ESD) MEF 1.0 - Ethernet Service Model (ESM) (Ratified Sept. 2003) Ethernet Traffic Management (ETM) Metro Ethernet Services Overview v1.2

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 services Metro Ethernet Services Overview v1.2

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 ESD Defined in ESM (MEF 1.0) and ETM Defined in ESM (MEF 1.0) and ETM Metro Ethernet Services Overview v1.2

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 UNI Metro Ethernet Network (MEN) CE UNI CE Metro Ethernet Services Overview v1.2

Ethernet Service Type defined in ESD 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 constructs used to create services Metro Ethernet Services Overview v1.2

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 MEN UNI MEN Point-to-Point EVC Multipoint-to-Multipoint EVC EVCs help conceptualize the service connectivity Metro Ethernet Services Overview v1.2

Ethernet Service Attributes defined in MEF 1.0, ESD and ETM 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 characteristics Metro Ethernet Services Overview v1.2

UNI and EVC Service Attribute Details Service Attributes defined in MEF 1.0 Technical Specification

EVC Service Attributes Service Attribute Parameters EVC Type Point-to-Point or Multipoint-to-Multipoint UNI List A 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 Performance Specifies 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 v1.2

UNI Service Attributes Service 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 Bundling No 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 v1.2

E-Line and E-LAN Service Types defined in ESD Point-to-Point EVC 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 UNI CE MEN CE UNI E-Line Service type Multipoint-to-Multipoint EVC UNI UNI CE CE MEN CE UNI UNI CE E-LAN Service type Metro Ethernet Services Overview v1.2

Example Service using E-Line Service Type Ethernet Virtual Private Line Supports Service Multiplexed UNI Point-to-Point VPN for site interconnectivity Point-to-Point EVCs Point-to-Point FR PVCs Ethernet UNI Service Multiplexed Ethernet UNI FR UNI FR UNI CE FR CPE MEN MEN CE FR CPE FR CPE CE Ethernet UNI FR UNI Ethernet Virtual Private Line using E-Line Service type Frame Relay Analogy to E-Line Service Metro Ethernet Services Overview v1.2

Example Service using E-Line Service Type Ethernet Private Line Dedicated UNIs for Point-to-Point connections Storage SP Point-to-Point EVCs (dedicated BW) Storage SP Dedicated TDM circuits Ethernet UNI OC-3 Ethernet UNI DS1 CE CE MEN MEN CE ISP POP CE ISP POP DS3 Ethernet UNI Internet Internet CE CE Ethernet UNI OC-3 Ethernet Private Line using E-Line Service type Private Line Analogy to E-Line Service Metro Ethernet Services Overview v1.2

Example Service using E-LAN Service Type Transparent LAN Service Transparent LAN Service (TLS) provides Intra-company Connectivity Full transparency of control protocols (BPDUs) New VLANs added without coordination with provider VLANs Sales Customer Service Engineering Multipoint-to-Multipoint EVC UNI 1 UNI 2 MEN UNI 3 VLANs Sales Customer Service VLANs Engineering TLS makes the MEN look like a LAN UNI 4 VLANs Sales Metro Ethernet Services Overview v1.2

Metro Ethernet Services Overview v1.2 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 with service performance assurances Metro Ethernet Services Overview v1.2

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 v1.2

Three Types of Bandwidth Profiles defined in ETM EVC1 EVC1 Ingress Bandwidth Profile Per EVC1 EVC2 EVC2 Ingress Bandwidth Profile Per Ingress UNI UNI UNI Ingress Bandwidth Profile Per EVC2 EVC3 EVC3 Ingress Bandwidth Profile Per EVC3 CE-VLAN CoS 6 CE-VLAN CoS 4 EVC1 Ingress Bandwidth Profile Per CoS ID 6 CE-VLAN CoS 2 UNI Ingress Bandwidth Profile Per CoS ID 4 Ingress Bandwidth Profile Per CoS ID 2 EVC2 Metro Ethernet Services Overview v1.2

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 v1.2

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 Class Service Characteristics CoS ID Bandwidth Profile per EVC per CoS ID Service Performance Premium Real-time IP telephony or IP video applications 6, 7 CIR > 0 EIR = 0 Delay < 5ms Jitter < 1ms Loss < 0.01% Silver Bursty mission critical data applications requiring low loss and delay (e.g., Storage) 4, 5 EIR ≤ UNI Speed Jitter = N/S Bronze Bursty data applications requiring bandwidth assurances 3, 4 Delay < 15ms Loss < 0.1% Standard Best effort service 0, 1, 2 CIR=0 EIR=UNI speed Delay < 30ms Loss < 0.5% Metro Ethernet Services Overview v1.2

Summary of Metro Ethernet Services Enabled Service over Ethernet Storage Internet Access IP VPN IP Telephony Video on Demand Ethernet Connectivity Service E-Line and E-LAN (Virtual and Private) Service Delivery Technology Ethernet over Fiber Ethernet over SONET/SDH Ethernet over RPR Ethernet over MPLS Ethernet over WDM Metro Ethernet Services Overview v1.2

Metro Ethernet Services Overview v1.2 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 v1.2

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 Metro Ethernet Services Overview v1.2