To all who responded, thank you.=20
Mark - that's one (of my no doubt many) points of confusion. I know a =
switch breaks up collision domains and a hub is shared media, therefore =
one collision domain. I also know that the NIC set to 100 means nothing =
as far as half or full duplex goes, as you can run 100 in either. I've =
searched around - trying Cogent's site though I think they are out of =
business - even reading and rereading Charles Spurgeon's Ethernet - The =
Definitive Guide. Yeah, I know, there's reading and there's the real =
world, I just wanted to check if my logic was correct. No where do I see =
anything about 100 Full Duplex hubs. Switches, sure, that's their reason =
for living for the most part. I have found some writings on the web =
saying that with certain "proprietary" (read - not based on the Ethernet =
Standard) hubs will run at 100 Full Duplex. What I haven't found is WHY =
or HOW they can do this.=20
Gene - yes that makes sense, but how do the NIC's decide to run half =
duplex if I've forced them to full? (I avoid auto-negotiate like the =
plague)?=20
David - Exactly my understanding. Collision detection is turned off at =
full duplex, so how in the hell is this thing working? I suspect the =
answer lies in the hardware specs (clever, aren't I?) but since I can't =
find them I'm bumbling around blindly.
Anyway, thanks for all the responses, it helps to no I wasn't entirely =
crazy...regarding this at least.
Thanks again
Patrick
"Mark Holloway" <[EMAIL PROTECTED]> wrote in message =
97poso$m4e$[EMAIL PROTECTED]">news:97poso$m4e$[EMAIL PROTECTED]...
> Well, a full duplex hub is typically called a switch. Just because =
the NICs
> are at 100 Full doesn't mean anything. Many times devices can be set =
for
> auto negotiate and not configure properly. You can force a setting on =
a NIC
> and even if it wrong, it will still work, but there may be errors and
> retransmissions will occur. If you only have two devices in this hub =
and
> they are only talking to each other, there may not be any collisions.
>=20
> Regards,
> Mark
>=20
> ""Patrick McAllister"" <[EMAIL PROTECTED]> wrote in message
> 007201c0a383$7e2ff7d0$6401a8c0@cartman">news:007201c0a383$7e2ff7d0$6401a8c0@cartman...
> > I know this isn't a Cisco question per se, and I apologize in =
advance.=3D20
> >
> > Is there such a thing as a full duplex 100BaseTx hub or repeater? I =
=3D
> > thought all hubs/repeaters had to run in half duplex.
> >
> > Here's the scenario, of sorts. I have a Cogent 1200 100Base TX Class =
I =3D
> > Repeater. I hook two PC's up to them and start transferring files. =
=3D
> > Everything works swimmingly. I look at the config after I'm done and =
=3D
> > both NIC's in the PC's are set to full duplex. There is (of course) =
no =3D
> > setting on the Cogent, and there is (of course) a collision light, =
but =3D
> > it never flashed during the transfer. I know I'm not the sharpest =
knife =3D
> > in the drawer, I accept that. But have I been laboring under a =3D
> > misconception all this time?=3D20
> >
> >
> >
> > _________________________________
> > FAQ, list archives, and subscription info:
> http://www.groupstudy.com/list/cisco.html
> > Report misconduct and Nondisclosure violations to =
[EMAIL PROTECTED]
> >
>=20
>=20
> _________________________________
> FAQ, list archives, and subscription info: =
http://www.groupstudy.com/list/cisco.html
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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