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This article provides an overview of the Spanning Tree Algorithm and the concept of Virtual Connections in ATM Networks. It explains the different types of connections and switching hardware used in ATM networks and discusses the design goals and terminology associated with them.
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The Need of Spanning Tree Algorithm Spring 2004
ATM is called a layer 2.5 protocol Spring 2004
Virtual Connections in ATM Networks • Virtual channel/circuit connections (VCC) : Basic unit of switching between two end users • Virtual path connection (VPC): Bundle of VCC with same end points (e.g. company sites) Spring 2004
Switching Hardware: Overview • Terminology: n x m switch has n inputs and m outputs • Design Goals • throughput (depends on traffic model) • Ports and Fabrics: reading assignment P212-P220 • ports • circuit management (e.g., map VCIs, route datagrams) • buffering (input and/or output) • fabric • as simple as possible, “self routing” • sometimes do buffering (internal) Spring 2004