Networking Research At OSU

Transcription

1 Networking Research At OSU Professor of Computer and Information Sciences Columbus, OH

2 Faculty: Our Team Dr. Dr. Mike Liu Dr. Steve Lai Dr. Wu-Chi Feng Dr. Gojko Babic Dr. Arjan Durresi Ph.D. Students: Rohit Goyal Bobby Vandalore M.S. Students: Justin Dolske S. Varadarajan Rizwan Mir Sonia Fahmy X. Cai Sohail Munir J. Iyer Mukul Goyal 2

3 Networking Research at OSU ATM Networks - and Gojko Babic Wireless Networks - Steve Lai Multimedia Networking - Wu Chi Feng and Protocol Engineering - Mike Liu 3

4 Overview Networking Trends ATM Traffic Management OSU National ATM Performance Testing Lab OCARnet: Ohio University Network Voice/Video over ATM 4

5 Trends Communication is more critical than computing Greeting cards contain more computing power than all computers before Genesis's game has more processing than 1976 Cray supercomputer. Internet: 0.3 M hosts in Jan 91 to 9.5 M by Jan 96 More than 5 billion (world population) in

6 Stone Age to Networking Age Microwave ovens, stereo, VCRs, had some effect. But, Stone, iron,, automotive, electricity, telephone, jet plane,, networks caused a fundamental change in our life style In 1994, 9% of households with PC had Internet link. By 1997, 26%. Soon 98% like TV and telephone. URL is more important than a company's phone number. (54 URLs in first 20 pages of March 97 Good Housekeeping.) Better communication Distance not important 6

7 Social Impact of Networking No need to get out for Office Shopping Education Entertainment Virtual Schools Virtual Cash Virtual Workplace (55 Million US workers will work remotely by 2000) 7

8 Cave Persons of

9 Life Cycles of Technologies Number of Problems Solved You are here Research Productization Time 9

10 Internet Technology 40M Host Count 30M 20M 10M Jan91 Jan97 Jan06 New Challenges: Exponential growth in number of users. Exponential growth in bandwidth per user. Traffic management, Security, Usability,... 10

11 ATM ATM Net = Data Net + Phone Net Combination of Internet method of communication (packet switching) and phone companies method (circuit switching) ATM 11

12 ATM vs Phone Networks 125 µs Current phone networks are synchronous (periodic). ATM = Asynchronous Transfer Mode Phone networks use circuit switching. ATM networks use Packet Switching In phone networks, all rates are multiple of 8 kbps. With ATM service, you can get any rate. You can vary your rate with time. With current phone networks, all high speed circuits are manually setup. ATM allows dialing any speed. 12

13 ATM vs Data Networks Internet Protocol (IP) is connectionless. You cannot reserve bandwidth in advance. ATM is connection-oriented. You declare your needs before using the network. Routers cannot guarantee bandwidth or delay. ATM networks reserve bandwidth and buffers. In IP, each packet is addressed and processed individually. Inefficient for continuous medi IP has little traffic management. ATM has 1996 traffic management technology. Required for high-speed and variable demands. 13

14 Traffic Management Source Destination Change rate to 12.3 Mbps Invented DECbit scheme in 1986: Bit Go up/down Used now in Frame Relay (FECN) Used in ATM (EFCI) In July 1994, we proposed Explicit Rate Approach. Current standard. Two patents. Collaboration with industry. 14

15 Computation Facilities Numerous high-powered computers: 1 715/64 (2.6 FP95) 6 715/100 (4.3 FP95), 9 C180s (18.7 FP95), 1 J282/2 (19.3 FP95) 6 P5-200 Desktops + 9 Laptop PCs J-280 fileserver with 64 GB 100 Mbps Ethernet and 155 Mbps ATM 622 Mbps Connection to OCARnet testbed Several switches with speeds from 25 to 622 Mbps World-class ATM Testing Lab with 25, 155, and 622 Mbps testing monitors 15

16 Facilities (Cont) HP 715/ Mbps uplink to the Internet (Planned upgrade to 100Mbps) J GB Switched Ethernet Qty. 6 HP 715/100 Switched Fast Ethernet (Planned) HP J282/2 PC PC Qty. 8 HP C Mbps 622 Mbps OCARNET Qty. 9 FORE ASX 200BX ATM Switch HP C180 16

17 Ohio Computing and Communications ATM Research Network Nine-Institution consortium lead by OSU Ohio State University Ohio Super Computer Center OARnet Cleveland State University Kent State University University of Dayton University of Cincinnati Wright State University University of Toledo OCARnet 17 WSU UD UC UT OSU KSU CSU vbns Cleveland OAR 155 M 622 M OSC

18 Univ of Toledo Wright State Univ Univ of Dayton OCARnet Toledo Univ of Cincinnati Dayton Cleveland 1.5 Mbps 1.5 Mbps Cincinnati 1.5 Mbps 155 Mbps OAR OAR net net Cleveland State Univ To vbns/mci 45 Mbps To NASA 155 Mbps Kent 622 Mbps Columbus 622 Mbps Kent State Univ Ohio Supercomputer Center WAN Switches Workgroup Switches 18 Ohio State Univ

19 Voice/Video over ATM Speech suppression Unused bandwidth can be used by data Cannot be used by voice. Hierarchical compression of Video Different users can see different bandwidth video Multipoint ABR Real-time ABR 19

20 Video Testbed OARNET Workstation 155 Mbps OSU Video Source Composite Video Source Composite FORE AVA Mbps 155 Mbps FORE ASX 1000 ATM Switch 622 Mbps FORE ASX 200BX ATM Switch FORE AVA 300 Video Monitor FORE ATV 300 FORE ATV 300 Composite Video Monitor 20

21 OSU National ATM Benchmarking Lab Started a new effort at ATM Forum in October 1995 Defining a new standard for frame based performance metrics and measurement methodologies We have a measurement lab with the latest ATM testing equipment. Funded by NSF and State of Ohio. The benchmark scripts can be run by any manufacturer/user in our lab or theirs. Modeled after Harvard benchmarking lab for routers 21

22 Performance Testing Facility OCARNET PC (To control and monitor the analyzer) ADTECH AX/4000 ATM Analyzer 155 Mbps or 25 Mbps Links Possible 622 Mbps Link FORE ASX 200BX ATM Switch Possible 622 Mbps or 155 Mbps Link FORE ASX 200BX ATM Switch 155 Mbps or 25 Mbps Links PC (To control and monitor the analyzer) ADTECH AX/4000 ATM Analyzer 22

23 CIS Networking Courses CIS 677: Introduction to Networking Offered every quarter CIS 678: Internetworking Offered once a year - Winter quarter CIS 777: Telecommunication Networks Offered once a year - Spring quarter CIS 788: Recent Advances in Networking () CIS 788: Wireless Networking (Steve Lai) CIS788: Multimedia Networking (Wu-Chi Feng) CIS788: Protocol Engineering (Mike Liu) 23

24 Summary Leading the ATM traffic management Leading ATM Performance benchmarking Leading regional ATM networks Emphasizing topics of interest to industry Good computing/experimental resources 24

25 Our Publications All our ATM Forum contributions and papers are available on-line at Specially see Recent Hot Papers 25

26 Thank You! 26