Ethernet Access Services Definition and Implementation

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• Ethernet Access Services Definition and
  Implementation

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Co-presented by
Arie Goldberg Omnitron CEO and Founder MEF Board
Member agoldberg_at_omnitron-systems.com
Ralph Santitoro Director of Carrier Ethernet
Solutions RSantitoro_at_TurinNetworks.com
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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
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Fundamental Ethernet Service Components
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
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Example of Ethernet Service Delivery over
Different Access/Transport Technologies
Ethernet Service Provider
I-NNI
PDH (E1/T1) Access Network Provider
E-NNI
MPLS Transport Network
Fiber Access 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
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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
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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
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• Ethernet Access Service Attributes

Ethernet Service Performance Metrics, Bandwidth
Profiles, CoS, Service Performance, and Fault
Management
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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
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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)

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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 networks Goodput
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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
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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
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Ethernet Service Continuity Check
UNI
IP/MPLS Core Network
UNI
Metro Aggregation Network
Metro Aggregation Network
Access Network
Access Network
MEP 2
MEP1
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 IPs
Ping but does much more
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Ethernet Link Trace
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 IPs
Traceroute
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Some Benefits of Ethernet L2 VPN versus IP VPN
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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

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