Resilient Packet Ring

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Presented BY:AKSHAY BHARDWAJ

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RPR Introduction An important trend in networking is the migration of packet-based technologies from Local Area Networks to Metropolitan Area Networks (MANs).

The rapidly increasing volume of data traffic in metro networks is challenging the capacity limits of existing transport infrastructures based on circuit-oriented technologies like SONET and ATM.

Packet based transport technology is considered by many to be the only alternative for scaling metro networks to meet the

demand.

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RPR Introduction

Packet based ring network for Metropolitan Area Networks (MANs).Towards to IEEE Standard, IEEE P802.17Based on Cisco Spatial Reuse Protocol Support up to 255 station attachmentsOptimized for rings with maximum circumference of 2000 kilometers

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SONET and Ethernet in Metro Rings

SONET have two types of network:

• Access Network :

•Fully Meshed Network:

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Resilient Packet Ring – Emerging Metro Network

Architecture

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Resilient Packet Ring is an emerging network architecture and technology designed to meet the requirements of a packet-based metropolitan area network.

Unlike incumbent architectures based on Ethernet switches or SONET ADMs(Add-drop muxes), RPR approaches the metro bottleneck problem with a clean slate.

RPR Layer Model

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•Layer model is consistent with 802 conventions.• Layer diagram is used to describe the architectural positioning and relationship of clauses within the overall RPR MAC.• The layer diagram is not a functional or block diagram.

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Main components of RPR

Spatial Reuse

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Main components of RPR

Topology discovery

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Main components of RPR

Traffic classes:There are three traffic classes in RPR:class A – designed for high priority traffic, in particular for flows with low delays and guaranteed link bandwidth demands (e.g. VoD services)class B – designed for medium priority traffic, in particular for packets for which the traffic contract isn’t possible to be filled (e.g. VoIP)class C – designed for low priority traffic, in particular for all best effort traffic (e.g. data transfer)

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RPR Characteristics

Packet ADM Architecture Physical Layer Versatility Resiliency Bandwidth Fairness Broadcast or Multicast Traffic Simplified Service Provisioning

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RPR devices act as packet ADMs connected to a shared medium.RPR devices act as packet ADMs connected to a shared medium.