Mar16 - CSE398: Network Systems Design Instructor: Dr....

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Unformatted text preview: CSE398: Network Systems Design Instructor: Dr. Liang Cheng Department of Computer Science and Engineering P.C. Rossin College of Engineering & Applied Science Lehigh University March 16, 2005 Instructor: Dr. Liang Cheng CSE398: Network Systems Design 03/16/05 Outline Recap Traditional protocol processing systems Start Part II Second generation network systems Third generation network systems Fourth generation network systems Network processor Summary and homework Instructor: Dr. Liang Cheng CSE398: Network Systems Design 03/16/05 Second Generation Network Systems Concurrent with ATM development (early 1990s) Purpose: scale to speeds faster than single CPU capacity Features Use classification instead of demultiplexing Decentralized architecture to offload CPU Design optimized for fast data path Instructor: Dr. Liang Cheng CSE398: Network Systems Design 03/16/05 Second GNS Details Multiple network interfaces Powerful NIC Private buffer memory High-speed hardware interconnects NICs General-purpose processor only handles exceptions Sufficient for medium speed interfaces (100 Mbps) NIC handles most of layers 1 - 3 Fast-path forwarding avoids CPU completely Instructor: Dr. Liang Cheng CSE398: Network Systems Design 03/16/05 Outline Second generation network systems Third generation network systems Fourth generation network systems Network processor Summary and homework Instructor: Dr. Liang Cheng CSE398: Network Systems Design 03/16/05 Third Generation Network Systems Late 1990s Functionality gets partitioned further Additional hardware on each NIC Almost all packet processing off- loaded from CPU Instructor: Dr. Liang Cheng CSE398: Network Systems Design 03/16/05 Third Generation Design NIC contains ASIC hardware Embedded processor plus code in ROM NIC handles Classification Forwarding Traffic policing Monitoring and statistics Instructor: Dr. Liang ChengInstructor: Dr....
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Mar16 - CSE398: Network Systems Design Instructor: Dr....

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