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Technology Stocks : Cisco Systems, Inc. (CSCO)

CSCO 76.94

+1.1%

Nov 28 9:30 AM EST

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To: Scott C. Lemon who wrote (12607)	2/26/1998 2:40:00 AM
From: Clare	Read Replies (1) of 77400

Scott, how do you define higher-layer object routing? Is it source route bridging or something? Hasn't that solution been shown to be unable to scale? Imagine each end-station having to send out explorer packets to find the route to a destination, and then encode the instructions into every packet they send. And because the complete routing information is in every packet header, the switching can't be as fast because each switch has to locate the position the instructions relevant to itself inside the header. IMHO point-to-point object routing requires connection-oriented setup and teardown, and doesn't scale. Layer 3 routing is hierarchical in nature and reduces complexity for end-stations, as well as intermediary routers. Hierarchical systems, like telephone numbers, post office addressing/zip codes, and IP addresses scale precisely because an end-station does not know nor has to care about the exact route to a destination. In anycase, you cannot eliminate lower layer switching unless you were directly connected.

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