[HECnet] Maximum number of L2 routers?

[Hans Vlems]

Bridges and repeaters, DEB   ETs and DEREPs, are proprietary dedicated devices.  

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   Origineel bericht   
Van: Cory Smelosky
Verzonden: zaterdag 28 februari 2015 22:24
Aan: hecnet at Update.UU.SE
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Maximum number of L2 routers?

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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