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Ethernet Access Services Definition and Implementation

Ethernet Access Services Definition and Implementation. Co-presented by:. Arie Goldberg Omnitron CEO and Founder MEF Board Member agoldberg@omnitron-systems.com. Ralph Santitoro Director of Carrier Ethernet Solutions Ralph@Marcom-Services.net.

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Ethernet Access Services Definition and Implementation

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  1. Ethernet Access Services Definition and Implementation

  2. Co-presented by: Arie Goldberg Omnitron CEO and Founder MEF Board Member agoldberg@omnitron-systems.com Ralph Santitoro Director of Carrier Ethernet Solutions Ralph@Marcom-Services.net

  3. Ethernet Service Delivery over Different Access Network Technologies 10/100BaseT 10/100BaseT Ethernet over Fiber (EoF) EoDSL Ethernet Service Provider Ethernet over SDH (EoS) 10/100BaseT Ethernet over PON/WDM Ethernet over HFC Ethernet over PDH (EoPDH) 10/100BaseT Coax 10/100BaseT Ethernet can be delivered over many different types of access network technologies

  4. Fundamental Ethernet Service Components I-NNI UNI E-NNI UNI EVC Access/Aggregation Network Access/Aggregation Network E-NNI Metro Transport / Core Network • 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 associate between 2 or more UNIs These Ethernet Service components are independent of the Access or Transport Network Technology to delivery the service

  5. Example of Ethernet Service Delivery over Different Access/Transport Technologies UNI1 E-NNI UNI2 Ethernet Service Provider I-NNI PDH (E1/T1) Access Network Provider E-NNI Fiber Access Network MPLS Transport Network 10Mbps EVC • PDH Access Network • EoPDH: N bonded E1s • MPLS Transport Network • Ethernet over MPLS • Fiber Access Network • Ethernet over Fiber (EoF) • 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) Subscriber is unaware of the various transport network technologies used to deliver this 10Mbps Ethernet Service

  6. 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 Service Networks • Ethernet access to Internet • Ethernet access to Managed VoIP service E-LAN E-Line Internet E-Line VoIP Ethernet Service: Layer 2 Service End-to-End Ethernet Access to IP Service: Layer 2 access to IP Service

  7. Comparison of Ethernet L2 VPN and IP VPN Services in Access Network • Ethernet L2 VPN Service • UNI • EVC (service) identified via VLAN ID • CoS identified via PCP • Forwarding on MAC or VLAN ID • IP VPN Service • Port • Service identified via IP address • CoS identified via DSCP • Forwarding on IP Address Service Provider Fundamental difference between Ethernet and IP Services in the access network is the information used to identify, forward and process service frames

  8. Ethernet Service Performance Metrics, Bandwidth Profiles, CoS, Service Performance, and Fault Management Ethernet Access Service Attributes

  9. Ethernet Service Performance Management • Key Metrics • Frame/Packet Delay (Latency) • Frame/Packet Delay Variation (Jitter) • Frame/Packet Loss Ratio • Service Availability • 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.1731 and MEF 10.1 define Ethernet service performance

  10. Ethernet Service Performance Metrics • Frame Delay (FD) and Frame Delay Variation (FDV) • Measured between UNI pairs via transmission and reception of a 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)

  11. Bandwidth Profiles (BWP) and CoS Bandwidth Profiles per EVC (service) and per CoS • CIR (Committed Information Rate) • CIR assured via Bandwidth Reservation and Traffic Engineering • 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-2 EVC-1 EIR EIR CIR CIR EVC-3 CIR EIR CoS 6 1Mbps CIR for VoIP • BWPs can divide bandwidth per EVC (service) over a single UNI • Multiple services over same port (UNI) • CoS markings enable the network to determine the network QoS to provide EVC1 CoS 2 6Mbps CIR for VPN data traffic 10Mbps UNI (port) UNI EVC2 3Mbps for Internet Access CIR defines the assured bandwidth EIR improves the network’s Goodput

  12. 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 by Carrier Ethernet network elements and NIDs

  13. 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 by Carrier Ethernet network elements and NIDs

  14. Ethernet Service Continuity Check MEP #1 CCMs sent every 10ms on working/protect paths Check for CCMs received from MEP #2 on working/protect paths MEP #1 No CCMs received from MEP #2 within 30ms (3 x 10ms) MEP #2 Initiate protection switchover MEP #1 Send CCMs with RDI flag set MEP #2 Remote alarm detected by received RDI Report alarm to management system MEP #1 Report CC fault to management system UNI IP/MPLS Core Network UNI Metro Aggregation Network Metro Aggregation Network Access Network Access Network MEP #2 MEP#1 MIP MIP MIP MIP Maintenance Association (MA) MIP MIP MEP #2 Report on CC fault if no CCMs are received from MEP #1 for 30ms MEP #2 CCMs sent every 10ms Check for CCMs received from MEP #1 Ethernet continuity check is analogous to IP’s Ping but does much more

  15. Ethernet Link Trace MIP MEP MIP MEP MIP MIP UNI IP/MPLS Core Network UNI Metro Aggregation Network Metro Aggregation Network Access Network Access Network Link trace Reply Ethernet Link Trace is analogous to IP’s Traceroute

  16. Some Benefits of Ethernet L2 VPN versus IP VPN

  17. 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

  18. Presentation available for download at: http://MetroEthernetForum.org/Presentations

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