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Technology Stocks : Ascend Communications (ASND)

ASND 207.04

+0.7%

Dec 8 3:59 PM EST

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To: Jim Miller who wrote (32795)	2/1/1998 2:38:00 PM
From: Marc Hyman	of 61433

--Is ASND's invention vis. eliminating the look-up bottleneck still proprietary? We're talking about the internal workings of a high speed router. Every router vendor has their own proprietary hardware and/or code. The QBRT is the name given to the hardware that does route lookups in the GRF products. Do you mean ''is Ascend selling this technology?'' I believe the answer to that is no. --Do you have an idea how other manufacturers have attacked this central problem? Faster processors, faster memory, better route lookup algorithms. Example: there are two articles in the Proceedings of ACM SIGCOMM '97 Conference (October 1997) that discuss better algorithms for fast route lookups. Some are also pushing for new/different routing protocols. See Tag Switching. --Does the inclusion of full lookup table data and parallel processing in each card have a down side --perhaps in cost? Yep. Two I can think of off hand... you've got to put a forwarding engine on every interface and you have to worry about how long it takes to move a packet from one interface to another. Note: I believe these same problems exist to some extent in all fast routers. --Sounds like a great application for ASICs. Any idea who makes them? Don't remember how it is implemented. // marc

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