Problem with autonegotiation on 3750 Electrical port
I am facing a weird issue with auto-negotiation in CISCO 3750 switches. I have configured one switch port as duplex full and speed 1000 in both the switches. Now when I am connecting these two switch ports with RJ45 cable the link is showing down. If I change the duplex mode to auto in any one of the switches or both are kept in auto mode the link do shows up with the same cable. This issue is not faced if I use the optical ports instead of electrical port. Is this the correct behavior?
Are you using cross-over cable or straight-through?- Straight-through.
And this the the reason of your initial problem: When you disable speed/duplex auto-negotiation you also disabled MDI/MDI-X. When this happens the link between two switches are down because you're using the wrong cable. The cable must be a cross-over cable.
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