Never seen that on a hub (hubs should of course not work with duplex)
However, I have seen this 'faking full-duplex' in other situations. Lights
on the switch (and the routers) indicated full duplex but data transfers (in
different directions at the same time) seemed slow.
I cleared the counters on the interfaces then inititiated massive transfers
in both directions. This was to see if any collisions showed up in "sh int"
(indicating that the full-duplex lights were 'full of it' [to use a tech
term]). The collision count soared. Cisco confirmed that this was an
effective (albeit screwy) way to confirm duplex status (or the lack thereof)
notwithstanding the status lights. Although that test is not
IOS-independent, it should work. My cure was to upgrade the IOS on the
routers.
>From: "Sasha" <[EMAIL PROTECTED]>
>Reply-To: "Sasha" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Full duplex and a hub
>Date: Wed, 14 Mar 2001 10:24:19 +0100
>
>Hi ALL,
>a fast Ether port on a cisco switch (2900XL)
>connected to a hub (3com repeater) 10/100 port
>reports auto-negotiated full-duplex, and works fine.
>How can a normal hub (no buffering!) accept full-duplex?
>To my undestanding this is impossible...
>Am I wrong?
>And, is there a simple way to check the duplex mode
>of a line by some IOS-independent method?
>Thanks.
>Alex
>==============
>
>
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