Re: Many things on ethernet together???


Vernon Schryver (sgi!vjs@ucbvax.Berkeley.EDU)
2 May 88 19:14:00 GMT


In article <218@turbo.RAY.COM>, Robin@turbo.RAY.COM (Robin Alston) writes:
>
> We have a bunch of SGI workstations currently running XNS over ethernet.
> We have just been informed that when we move into a new building at the
> end of May we will have to use a single ethernet cable for the whole
> building which includes many vaxen running VMS many many pc's with some kind
> of future-net link and many pc's with simple vax links.
>
> My question is can this really work?
> Can XNS and TCP-IP share the same coax cable with no possible problems?
> Can we have our own domain (we really have no interest at this time in
> talking to our vaxes), while decnet has its own on the same cable?

We have converted our ever growing network from our XNS to TCP. Two years
ago, we had ~100 workstations, some VAXes, and other stuff, all on one
cable. We used XNS almost exclusively, even on the VAXes. We now have
lots more workstations, more VAXes (VMS, 4.2+XNS+TCP, 4.3+NFS), PC-clones
running TCP, many cables, routers (our own, of course), bridges,
microwaves, an APRANET connection (also, of course, our own box--please
forgive the commercial), using almost exclusively TCP/IP/UDP. The
conversion was continuous; for most percentages n between 1 and 100, we
have had n% TCP and (100-n)% XNS, without trouble.

We also mix DECnet with TCP & XNS on the same cable, using IRIS's & VAXes
to gateway between TCP & DECnet.

We have been blessed with other, educational troubles. For example,
consider what groups of IRIS 4D's running the UDP-broadcast version of
'dog' at >30 frames/sec do to 750's, which think anything more than 20
broadcast packets/sec is a catastrophic storm.

Vernon Schryver
Silicon Graphics
vjs@sgi.com {decwrl,sun,pyramid,research,allegra,ucbvax}!sgi!vjs



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