The problem you are facing isn't osi layers. Its pinouts. The pinouts
for 10/100 ethernet are 1,2,3,and 6. 1 and 2 are tx and 3 and 6 are rx
on some devices such as switches, hubs, routers. and 3 and 6 are tx on
other devices, like nics. you use a crossover cable to connect tx to rx.
tell me if this helps.
larry
p.s. i might be backwards but the idea is the same.
-----Original Message-----
From: analogkid01 [mailto:[EMAIL PROTECTED]]
Sent: Friday, December 01, 2000 4:31 AM
To: cisco
Cc: analogkid01
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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