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Traffic Engineering and MSTP Benefits in Ethernet Bridged Networks - A Benchmark Study

This session explores the capabilities and intricacies of Multi-Protocol Spanning Tree Protocol (MSTP) in Ethernet bridged networks, highlighting its effective traffic load balancing, network resiliency, and management flexibility. It addresses MSTP’s parameter analysis, optimization techniques, and the ability to compute deterministic topologies for varying service loads. Despite its advantages, potential configuration challenges and limitations are discussed. The presentation includes case studies on ADSL traffic management and offers insights into efficient resource provisioning and network monitoring tools.

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Traffic Engineering and MSTP Benefits in Ethernet Bridged Networks - A Benchmark Study

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Presentation Transcript

  1. Traffic Engineering over Ethernet Bridged Networks Benchmarking Carrier Ethernet Technologies Session MII.3 Krakow, Poland - April 30, 2008 Rémi Clavier - Orange Labs

  2. MSTP generalities • MSTP: a native powerful control plane for Ethernet bridging • bring traffic load balancing • Instantiate up to 64 trees • enhance the resiliency of the network • increase the flexibility of the administration of the network • hierarchy with "Region" concept • But with some drawbacks • MSTP doesn't improve RSTP switching time • MSTP tuning can become a puzzle to configure, • except the "plug and play" use (with the poor performances of RSTP), • Specific tools may strongly help the operator • Analyze input data • Network properties, traffic assumptions, service change impacts • Optimize the network • Compute and download "good" MSTP parameters

  3. Traffic Engineering in a Bridged Network • Analyze: • A set of parameters gives a unique and deterministic topology • A given topology implies the paths used by services • For a set of services and a given topology it's easy to compute • if services are "End To End" connected • the load used by each Link • the load used by each Bridge • Provisioning: • A resource is provisioned if bandwidth is available • the bandwidth is available if the load of each link used is sufficient enough • It's easy to determine if addition of a new service will overload some links • MSTP allows load balancing over different resources • Resiliency • MSTP automatically computes and applies a new active topology if resources fail • All characteristics of this new topology are deterministic and may be computed • The switching time depends on the network complexity • MTSP works in a revertive restoration mode

  4. Topology And Physical resources Converge the Network and Analyze Loads & usages Textual and Graphical Reports Region and xSTI definition Services Functional description of the "analysing tool"

  5. Functional description of the "optimization tool" • The MSTP Control Plane is used in a native way • No changes on protocol • No change on BPDUs • No change of interaction between Control Plane and Data Plane • An efficient optimization because • runs at the Management Layer • Is centralized • Gives to the MSTP Control Plane • A full set of parameters (for each bridge, for each port) • A suggested VLAN Mapping • And various reports to the operator • From • The Physical Network • The Traffic Matrix • The type of optimization profile (user defined)

  6. Functional description Topology And Physical resources Converge the Network and Analyze Loads & usages Textual and Graphical Reports Region and xSTI definition xSTP Parameters VLAN mapping Services Optimization process

  7. Case study: ADSL collect - Topology

  8. Case study: ADSL collect -Traffic • P2P • TV Diffusion

  9. Case study: ADSL collect - Results No Link Over Loaded One Link Over Loaded Same number of Links Used 18/45 Links Used Better repartition of Traffic Load Balancing efficiency(27/45 links used)

  10. Thanks for your attention

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