National Inventors Hall of Fame
Inductees
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Radia Perlman

Robust Network Routing and Bridging

Patent Nos. 5,086,428; 7,339,900

Radia Perlman has played a key role in driving the growth and development of the Internet. Her best known contribution came in 1985: the spanning-tree protocol (STP), which transformed Ethernet from a technology limited to a few hundred nodes confined in a single building, into a technology that can create large networks with hundreds of thousands of nodes spread over a large area.

Another of Perlman’s notable contributions is making Internet routing reliable and scalable. Internet routes are computed with the collaboration of many machines, and Perlman’s techniques make the process efficient, self-organizing, and resilient even if not all the participants are behaving properly.

Perlman received her B.S., M.S., and Ph.D. degrees from MIT. She has received many awards, including induction into the National Academy of Engineering, the Internet Hall of Fame, and lifetime achievement awards from ACM’s SIGCOMM and Usenix.

Perlman holds over 100 U.S. patents. She is the author of Interconnections, a widely read text on network routing and bridging, and coauthor of Network Security, a text on cryptography and how it is used in networks. She is currently a Fellow at EMC Corporation.

Patent Number
Year
Name

5,086,428
1992
Reliable broadcast of information in a wide area network
7,339,900
2008
Method and apparatus for preventing spanning tree loops during traffic overload conditions

Born: December 18, 1951

Reliable broadcast of information in a wide area network

Patent No. 5,086,428

Issued February 4, 1992

 

Method and apparatus for preventing spanning tree loops during traffic overload conditions

Patent No. 7,339,900

Issued March 4, 2008

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