From: John Jones (acer0001@gmail.com)
Date: Mon May 21 2007 - 12:36:01 ART
I have seen this a lot on the switch modules for the 3640 in Dynamips. Hard
set the ports to what the error is suggesting: half duplex and whatever the
appropriate speed is on both sides. This will solve the problem.
John
On 5/20/07, Daniel Kutchin <daniel@kutchin.com> wrote:
>
> Your Duplex mode Auto-negotiation failed (which is usually the case when
> connecting FastEthernet and older Ethernet Ports)
>
> You expected the duplex settings to be autonegotiated correctly. You are
> probably following what the literature says:
> - Speed and Duplex modes are autonegotiated independently
> - Duplex mode signals from Ethernet ports are usually not understood by
> FastEthernet ports; or are non-existent.
> - In that case Duplex negotiation fails and Cisco FastEthernet ports
> default
> to HALF-Duplex (HDX) mode.
>
> I have encountered that in the field this is not so. When Cisco
> FastEthernet
> and Ethernet Ports (capable of both FDX and HDX) are connected together in
> autonegotiation mode, Ethernet Ports go to HDX and FastEthernet ports to
> FDX!
>
> So just select the Duplex settings manually and have your peace.
>
> Daniel
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Rob
> McDonald
> Sent: Sonntag, 20. Mai 2007 08:38
> To: Cisco certification
> Subject: Duplex mismatch error
>
> Hello group,
>
> This is a dumb question but I can't get rid of it. I thought this is very
> simple to deal with :(
>
> I'm seeing the following error on my switch:
>
>
>
> %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/16
> (not
> half duplex), with BB1 Ethernet1/0 (half duplex).
>
>
>
> BB1's Ethernet 1/0 is half duplex (Default mode)
>
> 3560's Switch port is set to Duplex auto.
>
> I do have full connectivity. Can someone please take a look at it.
>
> Thanks,
> Rob
>
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