[HECnet] Maximum number of L2 routers?

[Johnny Billquist]

On 2015-02-28 23:13, Clement T. Cole wrote:
I should have added when Stan and I wrote the original IP/TCP for VMS @ Tektronix did not have routing in it (nor mail support). We gave to CMU who enhanced it and I assume added routing.     DEC did not support an IP stack until much later - Johnny probably remembers when it became available. I had stopped having to hacking on VMS when I left Tektronix in '81.

I don't know, actually.

However, it should be pointed out that routing is not the same as bridging...

	Johnny


Sent from my iPad

On Feb 28, 2015, at 3:24 PM, Cory Smelosky <b4 at gewt.net> wrote:

On Sat, 28 Feb 2015, Johnny Billquist wrote:

Not sure what you mean with a star configuration. The first (proprietary) glass fiber repeaters were star designs, was that what you meant?

Not all ethernet segments have to be in one line. But since the maximum number of repeaters between any two nodes were two, you could (obviously) have repeaters in configurations that just made sure not more than two were involved in any given path, but there could be more than two totally.
The simplest such configuration would be a star.


How are you doing more than one line without bridges or repeaters? Have I misread?

(Not counting routing)

But my memory is fuzzy enough at this point that I should probably go read the docs instead of continuing to ramble here...

DEC also sold remote bridges and repeaters. A glass fiber trunc connected either two remote repeaters or bridges or one of each. I forgot how long a fiber segment could be, 2500 m IIRC. That gave you some room to plan on a large site. Two remote repeaters counted as one in the two repeater rule.
Expensive stuff though. A Lanbridge 100 was 30.000 guilders in 1988. A remote bridge was even more expensive.

Yeah.

But the ethernet was older than those devices. If my memory serves me right, the original repeater (from DEC) was the DEREP. Probably even more expensive back in the day. :-) And there were no bridges back then.


Hmmmm, when did VMS/BSD get software bridging capabilities?

      Johnny


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Cory Smelosky
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-- 
Johnny Billquist                                   || "I'm on a bus
                                                                  ||   on a psychedelic trip
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