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Im having problems with one of interfaces in my C831 router running on IOS Version 12.2(13)ZH2. I can change the duplex settings for e1 but not on e0. What seems to be the problem for this?
That's because your router has one 10BASE-T WAN port and four 10/100BASE-T ports. E0 is your WAN port and you cannot change the duplex on this interface.
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