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

2. Outlines Single IP Subnet Usage Model Deployment Requirements
Month 2002
doc.: IEEE /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

3. 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

4. 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

5. 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

6. 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

7. 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