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ESS Mesh Deployment Usage Model

ESS Mesh Deployment Usage Model. Ted Kuo, Tyan-Shu Jou, and Ming Sheu ted@janusysnetworks.com Janusys Networks, Inc. Date: May 11, 2004. Outlines. Single IP Subnet Usage Model Deployment Requirements Architectural Considerations Next Steps. Single IP Subnet Usage Model. Router. DHCP

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ESS Mesh Deployment Usage Model

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  1. ESS Mesh Deployment Usage Model Ted Kuo, Tyan-Shu Jou, and Ming Sheu ted@janusysnetworks.com Janusys Networks, Inc. Date: May 11, 2004 Ted Kuo, et al., Janusys Networks

  2. Outlines • Single IP Subnet Usage Model • Deployment Requirements • Architectural Considerations • Next Steps Ted Kuo, et al., Janusys Networks

  3. Single IP Subnet Usage Model Router DHCP Server Border MeshSW L2 SW WDS AP Mesh AP Mesh AP PC AP Mesh AP Mesh AP Mesh AP Mesh AP Mesh AP Mesh AP Mesh AP Mesh AP Mesh AP roaming Ted Kuo, et al., Janusys Networks

  4. Deployment Requirements • Preserve today’s IP-based application usage models • Transparently maintain robust L2 connectivity • Multiple border nodes to wired network • Possible wired clients • Interop with traditional APs • Both uplinks and downlinks • Easy to manage Ted Kuo, et al., Janusys Networks

  5. Architecture Considerations • Connectivity • Neighboring mesh nodes discovery • Dynamic Forwarding Path Calculation • Maintain forward path stability for predicable path latency • Dealing with RF changes effectively but should not be too sensitive • Take link quality metrics into consideration in path cost calculation • Reduce (src, dst) path distance within the ESS Mesh • Security • Mutual authentication among neighboring mesh nodes • Preshare key and/or Digital Certificates • Confidentiality • Pair-wise encryption between neighboring mesh switches • Broadcast/Multicast Handling • Centralized • Tunneling broadcast/multicast/unknown destination frames to a designated server • Distributed • Loop prevention - select broadcast/multicast forwarding neighbors Ted Kuo, et al., Janusys Networks

  6. Architecture Considerations (Cont’d) • STA Roaming • Within IP subnet - station association reporting mechanism • Across IP subnet - solve it at IP routers • IP Operation • IP address management for mesh switches • Effective DHCP and ARP handling • Management • Management and control capability • Minimize necessary configuration and management Ted Kuo, et al., Janusys Networks

  7. Next Steps • Define sets of criteria, according to (deployment and application) usage models, for solution (protocol or mechanism) selection • Feasibility/performance study on path forwarding algorithm with simulation models against reference topologies • Solicit available solutions for further consideration Ted Kuo, et al., Janusys Networks

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