Experiences with TCP/IP over an ATM OC12 WAN Page: 2 of 12
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The OC12 service, supplied by Sprint, was shared with other Sprint customers at a non-specific, yet
Berkeley, CA HP Argonne National
'Broadband L ab, Chicago, IL,
Faye Cis co GSR A TM Switches, Cis co GSR TCicCso
ASX1000 Router including SprintService Router LS1010 LS1010
Sun Ultra Sun Sun Ultra SGI Origin
II E4500 2C 16 CPU
2CPU S CPU2
Routed IP over ATM, OC12
Figure 1. This diagram shows the OC12 testbed between LBNL and ANL.
1.2 Test Scenarios and Tools Used
In order to evaluate the link a HP Broadband Analyzer was used at the ATM level. TTCP was used
for end-to-end TCP/IP and UDP/IP performance testing.
1.2.1 HP Analyzer for ATM Level Testing
The HP analyzer was used to test basic throughput at the ATM level by putting a loopback at the
remote end of the link on an ATM switch and sending cells at OC12 rates. Subsequent loopback
tests were done through the GSR router (see Figure 2). These particular tests were done at the ATM
level only and not at the IP level. Therefore, the link loopback used on the Cisco GSR precluded
any testing of the ATM policing parameters of the router at this step.
Lawrence Berkeley Argonne
National Lab, National Lab,
Berkeley, CA ATM cells looped back Chicago, IL
HP A TM A TM Switch A TM Switches, including A TM Switch CsoppS
Analyzer ASX 2oxAX2OXRue
ATM Loopback-Test Topology
Figure 2. This diagram shows the topology of the loopback ATM throughput tests. The loops are placed at the ATM
switch and at the GSR router. Each loopback (switch and router) is placed and tested separately.
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Nitzan, Rebecca L. & Tierney, Brian L. Experiences with TCP/IP over an ATM OC12 WAN, report, December 23, 1999; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc720224/m1/2/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.