The HUB is on the Physical layer and the switch on layer 2.
Aditya Kedia
----- Original Message -----
From: Mayo Joseph W CONT NSSG <[EMAIL PROTECTED]>
To: 'Bradley J. Wilson' <[EMAIL PROTECTED]>; cisco
<[EMAIL PROTECTED]>
Sent: Friday, December 01, 2000 2:16 PM
Subject: RE: Hub-to-Switch connection problem
> The hub and switch are both at the same OSI layer 2. The rule is still
> correct.
>
> JM
>
> Joseph Mayo
> Network Engineer
> Phone: (757) 393-9526 Fax: (757) 393-9847
> Email: [EMAIL PROTECTED]
>
>
>
> -----Original Message-----
> From: Bradley J. Wilson [mailto:[EMAIL PROTECTED]]
> Sent: Friday, December 01, 2000 7:31 AM
> To: cisco
> Subject: Hub-to-Switch connection problem
>
>
> Okay gang, I had an interesting and annoying situation yesterday morning,
> and I'd like to see if anyone else has had an experience like this:
>
> My client was installing an older BayStack 301 switch into their existing
> network, which consisted of a Bay Access Node router, as well as four
> stacked SynOptics LattisHubs. The router was experiencing excessive
> collisions, hence the installation of the switch. So we installed the
> switch and cabled the router to it, moved all the "power users" directly
> onto the switch, and left the other users attached to the hub. We
attached
> the hub to the switch via a straight-through cable.
>
> The users who were directly connected to the switch had no problem
accessing
> the network and Internet. The users on the hub were dead in the water.
We
> tried swapping out the cable between the hub and switch, tried plugging
> either end into different ports, tried flipping the MDI/MDI-X switch, and
> nothing worked. The only thing that *did* work was using a *crossover*
> cable between the hub and the switch.
>
> Now, the rule (which I gleaned from this newsgroup, btw) is that when
you're
> connecting devices at different OSI layers, you use a straight-through -
> e.g. PC to hub, PC to switch, switch to router, hub to switch - that's all
> straight-through. You use a crossover when you're connecting devices at
the
> same OSI layer - router to router, switch to switch, hub to hub, PC to PC.
> In the situation yesterday, a straight-through seemed logical, as we were
> trying to connect a hub to a switch. Am I wrong here? Why did the
> crossover work?
>
> Thanks,
>
> BJ
>
> P.S. sorry for the Bay-centric example...I'm trying to get them to change
> that. ;-)
>
>
>
>
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