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TRAFFIC-DRIVEN OPTIMIZATION OF ROUTING FOR METROPOLITAN ETHERNET NETWORKS

TRAFFIC-DRIVEN OPTIMIZATION OF ROUTING FOR METROPOLITAN ETHERNET NETWORKS. Andr ás Kern , Tibor Cinkler, Istv án Moldován. Ethernet in Metro Access Networks. Introduce Ethernet into the Metro network ( M etro E thernet F orum): consistent network platform.

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TRAFFIC-DRIVEN OPTIMIZATION OF ROUTING FOR METROPOLITAN ETHERNET NETWORKS

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  1. TRAFFIC-DRIVEN OPTIMIZATION OF ROUTING FOR METROPOLITAN ETHERNET NETWORKS András Kern, Tibor Cinkler, István Moldován

  2. Ethernet in Metro Access Networks • Introduce Ethernet into the Metro network (Metro Ethernet Forum): • consistent network platform • Ethernet is the most dominating LAN technology • Cheap equipment + high speed (up to 10 Gbps) • Ethernet should be Carrier Grade: • Traffic separation • QoS • Operation, Administration Management • Reliability • Scalability World Telecommunications Congress 2006

  3. Routing in Ethernet: Spanning Trees Protocols (STP) • Spanning Trees form loop-free logical topologies • Their shape influenced by Port Costs • Provide restoration • MORE VLAN based spanning trees • Multiple spanning tree instances • Each tree runs a separate Rapid STP instance • 1 VLAN  1 tree • By default tree spanning is “Topology-Driven”: • Port costs based on topology and link capacities • Costs can be set manually (to obtain desired trees) World Telecommunications Congress 2006

  4. Resilience • MSTP supports restoration • Does NOT consider either QoS or bandwidth reqs.  may harm them. • Protection at Ethernet level • Ethernet Protection Switch (EPS) • VLAN switching • 2 VLANs: one for working one for backup • After link failure switch to backup VLAN • Supports QoS and bandwidth reqs.!!!! World Telecommunications Congress 2006

  5. Quality of Service • Priority based scheduling: • Lower priority traffic is not served until there is higher priority traffic in the queue. • To ensure low delay for each QoS class:amount of higher priority traffic should be limited for each link • For each QoS class • Global • Static • Predefined limit is given. • The method of how to determine these limits is out of scope. World Telecommunications Congress 2006

  6. Traffic Driven Optimization Method

  7. Traffic Driven Optimization of Metro Ethernet • Layer 2 TE • optimal network utilization, allowing high bandwidth but no protection, • good throughput with dedicated protection switching • To reach it: • Span more tree instances, and • Assign the VLANs (traffic demands) to these trees • Optimization aim is to: • Minimize the network usage to maximize the throughput while • Neither QoS nor bandwidth are violated • We proposed ILP based method to solve this problem World Telecommunications Congress 2006

  8. Resilience in Traffic Driven Metro Ethernet • Alternatives: • Counting on the repairing capability of RSTP • Protection based on VLAN switching • Two link disjoint VLANs for each demands • same capacity is dedicated at both VLANs • Only prioritized traffic is protected with VLAN switching • Backup capacity is dedicated for them • It can be shared with BE traffic! World Telecommunications Congress 2006

  9. Performance of Traffic Driven Optimization

  10. TrafficDestination TrafficSource Assumed Topology • The traffic flows from the ANs to the ENs • Root of Tree instances at ENs. World Telecommunications Congress 2006

  11. Traffic model • 3 QoS + 1 best effort traffic class. • Between every access-edge node pair one aggregated demand for each TC • Throughput estimator parameter (Global traffic level) Demand sizes are based on: • Traffic Class Ratio • Global Traffic Level World Telecommunications Congress 2006

  12. Achieved Throughput The throughput significantly increased! But why? World Telecommunications Congress 2006

  13. Balancing the trees Topology Driven MSTP Optimized Tree instance Bottleneck!!! World Telecommunications Congress 2006

  14. Resilience • Topology driven: • 100% resilience • Low throughput • Optimizing MSTP: • Using redundant links • Higher throughput but lower resilience • VLAN protection: • Decreased throughput • Higher resilience World Telecommunications Congress 2006

  15. Conclusion • QoS + Protection + TE • Can be realized using MSTP • But tree optimization is required • We presented an ILP model for • Optimization • QoS, capacity and protection constraints are fulfilled • Significantly increased throughput is realized • RSTP Restoration does not consider • VLAN switch based protection is proposed • Halves the throughput but considers QoS! • Selective protection is proposed • Tradeoff between throughput and protection World Telecommunications Congress 2006

  16. Thank You

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