Happened to me before, connecting old 10mbit noname hubs to 3com
officeconnect ones. the switch on the 3coms did not work with those,
only a crosscable did work. Never discovered why, although obviously
those old hubs were blamed :)
Heiko
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>-----Original Message-----
>From: Kevin Wigle [mailto:[EMAIL PROTECTED]]
>Sent: Friday, December 01, 2000 5:51 PM
>To: 'Bradley J. Wilson'; cisco
>Subject: Re: Hub-to-Switch connection problem
>
>
>I'm wondering why the MDI/MDI-X switch did not help.
>
>At any time using this switch did you see a link light on the eqpt? no
>link - flip the switch, also no light? - check the cable.
>(however a x-over
>cable and engaged MDI-X would be straight through :-))))
>
>I have used all manner of eqpt and the MDI/MDI-X worked as
>expected, just
>like uplink ports, etc.
>
>Kevin Wigle
>
>----- Original Message -----
>From: "Mayo Joseph W CONT NSSG" <[EMAIL PROTECTED]>
>To: "'Bradley J. Wilson'" <[EMAIL PROTECTED]>; "cisco"
><[EMAIL PROTECTED]>
>Sent: Friday, December 01, 2000 9:16 AM
>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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