Re: Taps and 10/100 hubs

[Jeff Kell <jeff-kell () utc edu>]

Craig Paterson wrote:

> Bamm Visscher wrote:
>
> > The intelligent bridge is between 10MB and 100MB traffic.  Since your
> > IDS nic is 100MB, it will never see the 10MB traffic being sent to the
> > hub (unless your nic can be forced down to 10MB). Even if you can
> > force the nic to negotiate down to 10MB, every time you see that
> > collision light on the hub go blinky-blink, another packet will be
> > lost to /dev/null, never to be seen again (and since the router/switch
> > passed the packet on w/o problems, don't expect a retransmit). On the
> > positive side, your perf stats will rock ;)
The 10/100 transition to hubs and then switches was a rather rocky one 
and had many misleading claims (or at least nomenclature) between 
various vendors.  One vendor offered a "10/100 switch" but failed to 
mention that it did not bridge between the different speeds.  It was a 
10Mb and a 100Mb hub that "switched" you to the proper backplane based 
on your autonegotiation status.  In either case, it was half-duplex, as 
it was essentially two hubs.
If you wanted to uplink both 10 and 100 you needed to run two uplinks.

Even more would play "least common denominator" so that if you hooked 
all 100Mb devices, it would feed out 100Mb (half duplex).  Otherwise if 
it negotiated down to 10Mb, it reset itself to essentialy a 10Mb hub.

Back in the dark ages, Synoptics had a 5000 "switch".  But if you 
analyzed it down to the network level, the thing had 12 separate 10Mb 
backplanes, annd you could assign any input port to any of the 12 
backplanes.  But it was most decidedly an (expensive) 10Mb hub.

(Been there, done that, it's quite dead and gone now).

Jeff


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