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Praveen Bhaniramka, Wei Sun, Raj Jain The Ohio State University Contact: Jain@cse.ohio-State.Edu

Quality of Service using Traffic Engineering over MPLS : An Analysis draft-bhani-mpls-te-anal-00.txt. Praveen Bhaniramka, Wei Sun, Raj Jain The Ohio State University Contact: Jain@cse.ohio-State.Edu These slides, ID, and a paper are available online at

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Praveen Bhaniramka, Wei Sun, Raj Jain The Ohio State University Contact: Jain@cse.ohio-State.Edu

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  1. Quality of Service using Traffic Engineering over MPLS: An Analysisdraft-bhani-mpls-te-anal-00.txt Praveen Bhaniramka, Wei Sun, Raj Jain The Ohio State University Contact: Jain@cse.ohio-State.Edu These slides, ID, and a paper are available online at http://www.cse.ohio-state.edu/~jain/ietf/

  2. Overview • Traffic Engineering: Trunks, LSPs, Links • Simulation Model • Results for 4 different scenarios • Conclusions

  3. Traffic Engineering • Optimize the utilization of network resources • Using MPLS • Explicit Routing • Policy Routing • Traffic aggregation and disaggregation • Constraint Based Routing

  4. Trunk Flows LSP Link LSP Flows, Trunks, LSPs, and Links • Label Switched Path (LSP): All packets with the same label • Trunk: Same Label+Exp • Flow: Same MPLS+IP+TCP headers DL Label Exp SI TTL IP TCP

  5. Simulation Model R3 Src 1 Dest 1 • Sources 1..n send TCP and UDP packets to Dest 1..n • R2-R3-R5 is a high bandwidth (45 Mpbs) path. • R2-R4-R5 is a low bandwidth (15 Mbps) path. • All links have 5ms delay • TCP1 MSS = 512 B, TCP2 MSS = 1024 B, UDP MSS = 210B 60 Mbps 60 Mbps 45 Mbps R1 R2 R5 R6 15 Mbps Src n Dest n R4

  6. Simulation Scenarios 1. Normal IP with Best Effort routing 2. Two trunks using Label Switched Paths • Trunk 1: R1-R2-R3-R5-R6 • TCP and UDP sources are multiplexed over this trunk • Trunk 2: R1-R2-R4-R5-R6 • Only TCP sources over this trunk 3. Three trunks using Label Switched Paths • All three flows are isolated. 4. Non End-to-end trunks.

  7. Case 1: No Trunks, No MPLS • 15 Mbps path not used at all • TCP suffers as UDP increases its rate • Unfairness among TCP flows UDP TCP2 TCP1

  8. Two trunks w UDP + TCP Mixed • Total throughput > 45 Mbps (both paths used) • TCP flows sharing the trunk with UDP suffer • TCP flow not sharing with UDP do not suffer UDP TCP2 TCP1

  9. 3 Trunks w Isolated TCP, UDP • TCP flows are not affected by UDP and achieve a fairly constant throughput UDP TCP1 TCP2

  10. Non End-to-End Trunks • TCP flows are affected by UDP in the shared path UDP TCP2 TCP1

  11. Other Factors • Queue Service Policies: WFQ, WF2Q, WF2Q+ • Packet drop policies: RED, Tail drop • Round Trip Time • TCP parameters:MSS, window size, etc.

  12. Summary • Total network throughput improves significantly with proper traffic engineering • Congestion-unresponsive flows affect congestion- responsive flows • Separate trunks for different types of flows • Trunks should be end-to-end • Trunk + No Trunk = No Trunk

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