ESS Mesh Deployment Usage Model May 2004 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

Outlines Single IP Subnet Usage Model Deployment Requirements Month 2002 doc.: IEEE 802.11-02/xxxr0 May 2004 Outlines Single IP Subnet Usage Model Deployment Requirements Architectural Considerations Next Steps Ted Kuo, et al., Janusys Networks John Doe, His Company

Single IP Subnet Usage Model May 2004 Single IP Subnet Usage Model Router DHCP Server Border MeshSW L2 SW WDS AP Mesh AP PC Mesh AP 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

Deployment Requirements May 2004 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

Architecture Considerations May 2004 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

Architecture Considerations (Cont’d) May 2004 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

May 2004 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