More recently she invented the concept of TRILL, which improves upon spanning tree while still "being Ethernet". Many of the technologies she designed have been deployed in the Internet for decades, including the IS-IS routing protocol, many of the ideas of which were also deployed in the OSPF routing protocol, and the spanning tree algorithm that has been the heart of Ethernet. Radia Perlman is a Fellow at Intel Labs, specializing on network protocols and security protocols. We'll discuss various technologies for cloud "fabrics" (networks), including Ethernet, Infiniband, TRILL, IP, OpenFlow, etc. This talk covers a variety of topics, including advice on how to get to the heart of what might be intrinsic differences, separate out orthogonal issues rather than focusing on complete specifications, and compare technologies without emotion. Very little is intrinsically true, since any of the designs can be changed to answer any criticism, or unfavorable comparison with another approach. Very few people know anything more than the details of one approach, and the field is clouded with hype, and rivalry between competing teams. SFU Harbour Centre, Vancouver (Room 1510)Ī lot of what "everyone knows" about network protocols is, actually, false. (Presentation is available in pdf format.) Title: Myths and Mysteries in the Network Protocol World She has a PhD from MIT, holds over 100 issued patents, and has received various industry awards, including lifetime achievement awards from ACM’s SIGCOMM and Usenix, and an honorary doctorate from KTH.IEEE Circuits and Systems Society joint Chapter of the Vancouver/Victoria Sections She’s the author of the textbook “Interconnections”, and coauthor of the textbook “Network Security”. She has a long history of contributions to network protocols and security protocols, including the spanning tree algorithm (that converted Ethernet from a single wire to something that can support a fairly large network), robust and scalable link state routing, TRILL (which eliminates the routing limitations of spanning tree), networks resilient to malicious participants, and expiration of data from a cloud. Radia Perlman recently joined EMC as an Industry Fellow. The point of this tutorial is to get people to think critically and encourage questioning of "common knowledge", as well as to entertain and enlighten. We will discuss how Ethernet evolved from CSMA/CD to spanning tree to TRILL, how it interacts with IP, and also analyze the buzzword "SDN", and discuss multiple orthogonal technologies that people sometimes mean when they use the term, and/or which of these are actually new. So the question really is "why do we have two layer 3 protocols", and the answer to that is quite deep and interesting. Well, actually, according to a technical view of network protocols, Ethernet as originally invented (CSMA/CD) was a layer 2 protocol, but ever since spanning tree, it is actually layer 3, since packets are forwarded. For instance, if you ask why we have both IP and Ethernet, most people will say "because IP is layer 3 and Ethernet is layer 2". Some questions might seem really basic, and "everyone knows" the answer. Even though some people might think they know what some term means, if the term means different things to different people, then using the term does not accurately convey what the speaker thinks he is saying. Buzzwords start getting used, and people use them without knowing what, if anything they mean. Title: Network Protocols: Myths, Mistakes, and MysteriesĪbstract: A lot of what "everyone knows" about networks is actually false! Network classes at universities tend to just tell students to memorize the exact details of the currently deployed standards, without letting students have the insight to understand design alternatives that could have made networking better.
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