Curtis,

We have done tests on two switches with various configurations - 10 sparcstaions, 3 7000's, AGS+, Kentrox, as well as other boxes for bridging protocol stacks. We have not yet artificially insert 70 msec delay. With your request, we will get on to that ASAP. One question here: since we are happy with what we found out so far in the lab it would be nice if we move the tests closer and closer to the real environment. I heard you have a test network. Can I connect my NAP prototype at Morristown NJ to your test network to study the effect of cross country delay?

Liang

Sure - you are buying the DS3 circuit - right. Would you like to bring some of this equipment to NY? We are not far from the Tapan Zee Bridge, so you could easily drive some equipment over. That might be a wee bit more pracrtical than pulling a DS3. Just for the record, Eric Bennet asked me about testing the NAP configurations at least 3-4 months ago and I pointed out that egress bottlenecks and cross country delays should be considered. Even if the traffic doesn't appear day one, you want to know if you have a potential for collapse as load increases. We have recently run performance tests using multiple TCP flows and the equipment we currently use. We currently have a 68 msec and 20 msec path, though we may lose the 68 msec path soon. If you help set up, I can do 2 automated 12 hour runs, one at 20 msec, one at 68 msec, and we can do a direct comparison. Doesn't Belcore have some form of delay simulator for DS3? Such things do exist. BTW - If the 10 SSs are not running RFC1323 and using large windows over a long delay you will see much less burstiness than in the tests we have been running. If you are interested we can take this discussion off line and work out the logistics. It would be in the interest of a smooth transition to know what the limits are. There may be cause for concern or no problem at all. Curtis