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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS TRAFFIC-DRIVEN OPTIMIZATION OF ROUTING FOR METROPOLITAN ETHERNET NETWORKS András Kern, Tibor Cinkler, István Moldován
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 20062 » Ethernet is the most dominating LAN technology » Cheap equipment + high speed (up to 10 Gbps) Ethernet in Metro Access Networks » Introduce Ethernet into the Metro network (Metro Ethernet Forum): » consistent network platform » Ethernet should be Carrier Grade: » Traffic separation » QoS » Operation, Administration Management » Reliability » Scalability
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 20063 Routing in Ethernet: Spanning Trees Protocols (STP) » 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) » Spanning Trees form loop-free logical topologies » Their shape influenced by Port Costs » Provide restoration
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 20064 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.!!!!
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 20065 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.
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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS Traffic Driven Optimization Method
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 20067 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
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 20068 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!
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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS Performance of Traffic Driven Optimization
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 200610 Assumed Topology » The traffic flows from the ANs to the ENs » Root of Tree instances at ENs. Traffic Source Traffic Destinatio n
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 200611 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) Class nameTraffic Class Ratio Platinum3% Gold13% Silver30% BE54% Demand sizes are based on: » Traffic Class Ratio » Global Traffic Level
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 200612 Achieved Throughput The throughput significantly increased! But why?
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 200613 Balancing the trees Topology Driven MSTPOptimized Tree instance Bottleneck!!!
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 200614 Resilience » Topology driven: » 100% resilience » Low throughput » Optimizing MSTP: » Using redundant links » Higher throughput but lower resilience » VLAN protection: » Decreased throughput » Higher resilience
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BME - TMIT BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS World Telecommunications Congress 200615 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
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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS DEPARTMENT OF TELECOMMUNICATIONS AND MEDIA INFORMATICS Thank You
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