From: Mike Stout (michaelgstout@gmail.com)
Date: Tue Jan 22 2008 - 04:52:31 ARST
Here is the answer.
http://en.wikipedia.org/wiki/Autonegotiation
On Jan 20, 2008 10:27 AM, kang lee <kanghlee@gmail.com> wrote:
> Hi GS,
>
> I have a trivial question.
>
> I have duplex mismatch when I do dot1q tunnel to 10Mb ethernet router
> port.
> Ethernet router port does not have duplex auto feature and other end of
> dot1q tunnel has 100 Mb duplex auto feature. I am also sending l2protocol
> cdp.
>
> R5-e1(10Mb no duplex auto feature: current - duplex half) <->
> Sw3-Fa0/5(duplex auto: dot1q tunnel)=Sw4-Fa0/18(duplex auto: dot1q
> tunnel)<-> SW2-Fa0/21(duplex auto: router port- "no switchport")
>
> I tried to change all the ports to duplex half and it made link between
> SW4
> and SW2 goes down. It is also same way for half duplex.
>
>
> I also had similar problem when I configure network go through CiscoSw1
> <->
> non Cisco Sw1( 10 Mb) -- Non Cisco Sw2(100Mb) <-> Cisco Sw2. it was for
> home
> lab.
>
> I see why it is causing problems but any solution to fix this.
>
> Thanks
>
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