Overlay nodes operate at the application layer tradeoffs

Overlay nodes operate at the application layer

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Overlay nodes operate at the application layer Performance/deployment tradeoffs u Anybody can deploy an overlay network u But Active networks could be much more efficient 14 CSE 222A – Lecture 4: Routing
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Active Nodes Execute protocols in restricted environment u Limits access to sensitive/shared resources Primitives for application-defined protocol processing Enforce limits on resource consumption u Active Nodes responsible for network integrity and errors u TTL fields decreased as resources are consumed u Capsules with 0 TTL’s discarded Code propagation u Capsules identify protocol u Protocol uniquely define code path, Active Node retrieves it u MD-5 signature for safety 15 CSE 222A – Lecture 4: Routing
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ANTS Java toolkit for writing and executing active protocol code Goals u Simultaneous use of multiple network protocols u Deploy multiple protocols with no central control (orig) u Dynamic deployment of new protocols (orig) Migration path from non-active to active world u Benefits from a small number of active nodes u Rather than make hop by hop routing decisions, make active node to active node routing decisions u Minimum number of nodes necessary for success? u Small number of nodes successful/meltdown under scale? 16 CSE 222A – Lecture 4: Routing
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For Next Class… Read Wetherall ‘98 Submit project ideas by Thursday u I’ll post some suggestions by next week u We’ll post ideas/names to help you find groups afterwards u Email to me 17 CSE 222A – Lecture 4: Routing
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  • Fall '08
  • Vahdat,A
  • Paxson

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