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Connection-oriented Ethernet Attributes and Applications



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  • Session 3: Fujitsu Packet Optical Solutions 04/14/10
  • Session 3: Fujitsu Packet Optical Solutions 04/14/10


  • 1. Connection-oriented Ethernet Attributes and Applications Ralph Santitoro [email_address] 3Q09 Toronto Meeting July 22, 2009
  • 2. Contents
    • CLE and COE: 2 implementations of Ethernet
    • COE Attributes
    • COE Applications
  • 3. Connectionless Ethernet (CLE)
  • 4. Connectionless Ethernet (CLE) Challenges
    • Ethernet switches forward frames to correct port based on destination MAC address (DA)
    • If destination MAC address unknown, switches broadcast frames to all ports (called flooding)
    • Flooding creates additional BW requirements on all links
    • Amount of flooding is not predictable
      • DA becomes known by “learning”
      • DA becomes unknown when the bridges age out MAC table entries in their memory ~ 5 minutes
      • Table entry will not age out if frames keep coming—but no one can control this
    Flooding plays havoc with QoS and resource reservation
  • 5. Flooding Simplified DA = Destination Address I know where C is (for now) Where is C again? Multipoint EVC DA=C A B C CE CE CE DA=C DA=C Flooding: Destination MAC address has unknown destination port Multipoint EVC DA=C A B C CE CE CE DA=C Destination MAC address has a known destination port
  • 6. CLE Challenges: Spanning Tree Protocol A B C STP Blocked Link D CE CE CE CE A B C CE CE CE CE D Link Failure Failover New STP Blocked Link STP: up to 2s protection switching speeds. Difficult provisioning
  • 7. Connection-oriented Ethernet (COE)
    • Provides explicit definition of Ethernet paths
      • Disables Ethernet MAC address learning & flooding
      • Ethernet paths could be:
        • End to end (EVC)
        • Individual network segments
    • Resource reservation and admission control per EVC per CoS
      • Per-connection (EVC/Path) traffic management and traffic engineering
    COE addresses the CLE challenges
  • 8. COE Supported Network Topologies / MEF Service Types Ring (E-Line or E-Tree) Hub & Spoke (E-Tree or Service Multiplexed EVPL) E-Line Linear Mesh (E-Line or E-Tree) COE supports many topologies to support popular Ethernet services
  • 9. EMS/NMS Plays Critical Role for COE
    • COE does not use bridging control protocols
      • NMS used to provision VLAN “cross connects” and tunnels
    • COE relies on EMS/NMS for
      • Setup working/protect traffic engineered EVCs or network segments
      • Setup bandwidth profiles (CIR/EIR) with BW reservation
        • CIR is really “guaranteed” like with SONET/SDH
      • Other OAM function such as Fault Management
    COE places more emphasis on the importance of the NMS
  • 10. COE: The best of both worlds
    • SONET / SDH
    • Deterministic and precision QoS
    • Bandwidth reserved per STS / STM
    • 99.999% Availability
    • Highest Security (L1 service)
    • Connectionless Ethernet
    • Layer 2 Aggregation
    • Statistical Multiplexing
    • Flexible Bandwidth Granularity
    • Cost Effectiveness
    • Connection-Oriented Ethernet
    • Layer 2 Aggregation and Statistical Multiplexing
    • Deterministic and precision QoS
    • Bandwidth reserved per connection
    • Flexible Bandwidth Granularity
    • 99.999% Availability
    • Cost effectiveness
    • Highest Security
    COE makes Carrier Ethernet more like a Layer 1 service but with all the benefits of Layer 2 Ethernet
  • 11. COE Key Benefits Attributes Benefits Explicit Definition of Ethernet Path Deterministic, Predictable, Scalable, Secure Resource Reservation and Connection Admission Control Guaranteed SLA’s Per Connection QoS and Traffic Engineering Bandwidth Profiles Tiered Services Robust Ethernet OAM Comprehensive Monitoring and Troubleshooting Carrier Class Service Protection < 50ms Protection / Restoration
  • 12. Why COE ?
    • Makes Ethernet more like SONET which has dominated the metro network
      • Network operations procedures similar to SONET
      • Smooth transition for SONET-trained operations personnel
    • Easily scales to meet large scale metro connectivity and aggregation requirements
    • Ideally suited for:
      • EoX Aggregation for handoff to service edge networks
      • Mobile Backhaul Networks
      • High Performance EVPL and EPL services
    COE focus today: Service Delivery and Infrastructure in the Metro
  • 13. Different approaches to COE
    • Ethernet-centric COE now being used in metro networks
    • MPLS-centric COE
      • Standards being developed.
      • Proposed usage for interconnection of MPLS core routers
    • Ethernet
    MPLS-centric COE Eth Eth
        • Ethernet
        • MPLS Pseudowire (PW)
        • MPLS Label Switched Path (LSP)
    VLAN Tag Switching Static PW T-MPLS MPLS-TP PBB-TE Ethernet-centric COE S-VLAN or PBB-TE Eth Eth MPLS LSP PW PW Ethernet-centric COE being deployed today
  • 14. COE Attributes
  • 15. Attributes of Connection-oriented Ethernet
    • High Reliability
    • 50ms Protection / Restoration
      • G.8031
    • 802.3ad Link Aggregation
    • Full Service Management
    • Link Fault Management
      • 802.3ah
    • Service (EVC) Fault Management
      • Y.1731, 802.1ag,
    • Security
    • Bridging disabled - no vulnerabilities
    • L2 DOS attacks mitigated
    • MAC DOS attacks mitigated
    • Standardized Services
    • EPL, EVPL, EP-Tree, EVP-Tree
      • MEF 6, MEF 10.2
    • High Scalability
    • Millions of EVCs
    • Layer 2 Aggregation
    • Statistical Multiplexing
    • Deterministic QoS
    • Low Delay, Delay Variation, Loss
      • Y.1731, 802.1ag, MEF 10.2
    • Bandwidth Resource Reservation
    COE Attributes COE is a high performance implementation of Carrier Ethernet
  • 16. COE Security: Comparable to SONET
    • Management VLANs isolated from Subscriber traffic
      • similar to DCN isolation from subscriber traffic in SONET networks
    • With COE, MAC Address Learning / Flooding is disabled
      • MAC Address spoofing cannot occur
      • MAC table overflow DOS attacks cannot occur
    • With COE, vulnerable Layer 2 Control Protocols (L2CPs) like STP are disabled
      • Protocol-based vulnerabilities (DOS attacks) are mitigated
    • With COE, bridging is disabled so additional ports cannot be bridged to the point-to-point service
      • Traffic snooping cannot occur
    COE provides security comparable Layer 1 (EoSONET) but without any of SONET bandwidth utilization issues
  • 17. Ethernet OAM for COE EVC1 EVC2 EVC3 Tunnel OAM EVC1, 2 and 3 Link OAM Link Service OAM MSC FLASHWAVE CDS FLASHWAVE CDS FLASHWAVE CDS Standard Fault Management Comparable to SONET ITU-T Y.1731 / IEEE 802.1ag Tunnel Layer STS Path / VCG ITU-T Y.1731 / IEEE 802.1ag Service (EVC) Layer VT1.5 or STS Path IEEE 802.3ah Link (physical) Layer SONET Line FLASHWAVE CDS COE leverages the complete set of Ethernet OAM standards
  • 18. COE Attributes for Network Survivability
    • IEEE 802.3ad Link Aggregation Groups (LAG)
      • For local (link level) diversity and protection
      • If any fiber or port in LAG fails, other LAG members share the load
      • Can implement 1:1 protection with working/protect LAG members
    • ITU-T G.8031 Linear Path Protection
      • for EVC path diversity and sub-50ms path protection
      • Similar to SONET 1+1 UPSR path protection
      • Simple Provisioning: Setup Working path and Protect path
      • Independent of Network Topology
        • Rings, Meshes, Multiple Rings and Linear Topologies
    COE achieves high availability via multiple levels of protection
  • 19. COE Provides Dedicated Protection Switching
    • Ethernet Linear Protection (ITU-T G.8031)
      • Dedicated protection resources
      • < 50ms protection switching time
      • Simple provisioning
    Link Failure Failover
  • 20. Link and Path Protection Equivalency SONET 1+1 OC-N 1+1 OC-N 1+1 OC-192 UPSR Ethernet 1:1 LAG 1:1 LAG GE GE G.8031 1+1 OC-N 1+1 OC-N 10GE 10GE 10GE 1:1 LAG 1:1 LAG COE protection similar to SONET
  • 21. COE Applications
  • 22. COE Application Categories
    • Transport and Infrastructure
      • Layer 2 Aggregation to Service Edge Networks
      • Mobile Backhaul
      • Triple Play Residential Broadband Backhaul
        • IPTV, Video on Demand, Internet Access, Voice
      • Access to Network-based IP/MPLS VPNs
      • Access to MPLS Inter-Metro Core Network
    • Service Delivery
      • Layer 2 connectivity services
        • EPL and EVPL
        • EP-Tree and EVP-Tree
      • Ethernet Internet Access (EIA)
  • 23. COE for Layer 2 EoX Aggregation Infrastructure SONET EoS GbE/10GbE EoF PDH Access Network NxDS-3 NxDS-1 EoPDH OC-n Aggregation EoX Access GbE/10GbE Service Edges CPE EoCu Internet Access VoIP/ IMS IP VPN MPLS Inter-Metro LD Core MTSO Video Serving Office COE EoX Aggregation Network Copper Access Network GbE Switched Ethernet Services Eo λ COE for Ethernet Aggregation for all Service Edge Networks
  • 24. COE for Business Ethernet Services Service Multiplexed UNI UNI UNI UNI UNI COE Network EVC EVC EPL UNI UNI UNI COE Network EVC EVC EVPL Service Provider Network EVC Wholesale Access Provider Network UNI UNI E-NNI OVC Wholesale Ethernet Services Retail Ethernet Services COE COE
  • 25. COE for Mobile Backhaul
    • E-Line and E-Tree Service Types highly suitable for Mobile Backhaul Networks
    Cell Sites UNI MTSO UNI COE Backhaul Transport Network UNI UNI UNI COE meets the stringent requirements of Mobile Backhaul
  • 26. Summary
    • COE is a high performance implementation of Carrier Ethernet
      • With added Security benefits
    • COE provides a common metro EoX aggregation solution
      • for Ethernet access to all service edge networks
    • COE facilitates the evolution of SONET metro transport networks to Carrier Ethernet
      • COE is operationally similar to SONET
  • 27. COE Discussion