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

research & development France Telecom Group Session MII..3 – p 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 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

research & development France Telecom Group Session MII..3 – p 3 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 Traffic Engineering in a Bridged Network

research & development France Telecom Group Session MII..3 – p 4 Functional description of the "analysing tool" Topology And Physical resources Services Region and xSTI definition Textual and Graphical Reports Converge the Network and Analyze Loads & usages

research & development France Telecom Group Session MII..3 – p 5 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) Functional description of the "optimization tool"

research & development France Telecom Group Session MII..3 – p 6 Functional description Topology And Physical resources xSTP Parameters Textual and Graphical Reports VLAN mapping Services Region and xSTI definition Optimization process Converge the Network and Analyze Loads & usages

research & development France Telecom Group Session MII..3 – p 7 Case study: ADSL collect - Topology

research & development France Telecom Group Session MII..3 – p 8 Case study: ADSL collect -Traffic P2P TV Diffusion

research & development France Telecom Group Session MII..3 – p 9 Case study: ADSL collect - Results One Link Over Loaded 18/45 Links Used No Link Over Loaded Same number of Links Used Better repartition of Traffic Load Balancing efficiency(27/45 links used)

research & development France Telecom Group Session MII..3 – p 10