Resilient Packet Ring Requirements & Scope Ring aware Media Access Protocol (Algorithm) - Dual Counter Rotating Rings with no packet loss - Media Independence - will define a number of physical layers to be supported, - Support > Gigabit Ethernet Physical Layer - Support for SONET/SDH Physical Layers - Mac/PHY Interface; Frame Deliniation; etc etc etc - PHY Logical Interface and Service Model - Mac Logical Interface and Service Model - Scalability (range of: nodes; bit-rates; loop & span delay;) - Optimized for variable length packets - Provides Spatial Re-use (unicast packets are destination stripped) - Distributed Bandwidth Management - Predictable performance - Distributed Congestion management - Nodal (MAC layer) Ingress (to ring) Management - Fair and Dynamic distribution of Available Bandwidth * fair needs to be defined, and does unfair need to be supported? - Efficient Multicast & Broadcast support - Plug and Play - Topology Discovery - Configuration - Class of Service - Instrumentation, Performance Monitoring, Fault Isolation * Loss-less Low transit delay * Provide support for Guaranteed and Committed data rates and delays - COS features - priority on the ring - priority in the station - Protection - Fast Fault Recovery and Restoration - Facility Faults & Node Faults - Layer 1 / 2 interactions - Layer 2 / 3 interactions - Large MTU (9216 octects) - Encapsulation and Packet types * Ring Header extensions * Ethernet V2 * 802.3 LLC/SNAP - Compliance with 802 architecture Work Items - MAC Logical Interface and Services - PHY Logical Interface and Services - Traffic Models; - Performance Metrics; - Test Scenarios for comparison of ring operation schemes (Khaled Amer) - Scenarios: {Node count; Span distance; Bitrate} - Aggregation {Tier1 ISP; Tier2 ISP; MSO; Metro Customer; Pop}; - Mesh {Campus;Metro;WAN}; - Testing various functionalities of the ring - Fairness; congestion control; admission control; QOS - Traffic Characteristics: - Generation - Packet {rate; packet size; destination, priority} - {TCP;UDP} -Metrics: - End to End Packet Delay, - Jitter, - Access Delay - Link utilization; - Global throughput / Goodput - Packet Loss (ingress) 802.* Compliance (B.J. / Nader)