At 08:19 AM 10/12/00, Alldread AK2 Robert J wrote:
>I am just curious as to why SNA still runs on tokenring today.
IBM got their foot in the door at many large companies and then closed the
door behind them. The end result is that many companies deployed all
IBM-developed technologies. If a company uses their network for
mission-critical applications, it takes a long time for the network to
evolve, since changes risk bringing the network down.
> Is there any
>reason that it cannot just hook right into an ethernet network??
SNA can run on Ethernet. IBM and other vendors support this. It's actually
somewhat common.
> I have
>read a few white papers on SNA, and I assume that because tokenring was the
>major LAN media back in the day, and because SNA uses RIF's to determine
>paths to other hosts, that SNA was built requiring the use of RIF's. Is
>this correct??
Historically this is not correct. SNA has its own complex path
determination methods that were used on large "internetworks" long before
Token Ring and source-route bridging were ever invented. Long before LANs
were invented, come to think of it. SNA shipped in 1974, (though it didn't
catch on right away.) Token Ring's birth date is more like 1984.
The Internetworking Technologies Handbook does a pretty good job with SNA.
SNA is surprisingly still common, as is Token Ring. (At least in Southern
Oregon where I live!? &;-)
Priscilla
>thanx,
>
>skin-e
>
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Priscilla Oppenheimer
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