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New Member

3548 switch and 3662 router duplex mismatch-an easy question

Hi, I got the log as following:

%CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not half duplex), with router-1 FastEthernet0/26 (half duplex).

the router's f0/0 is full duplex and the switch's f0/26 is with default configuration (full duplex?), so will the cable be the factor to result in the above info?

Thanks for any help!

1 REPLY
New Member

Re: 3548 switch and 3662 router duplex mismatch-an easy question

Try setting the speed and duplex at each interface. The auto setting can cause troubles.

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