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. ;-)
_________________________________
FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
_________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
