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?
Re: Problem with autonegotiation on 3750 Electrical port
This not only means auto-negotiation is disabled but MDI/MDI-X is also disabled- Is this normal? Can we enable this forcefully?
No. If you disable speed and duplex auto-negotiation, MDI/MDI-X is disabled. There's no way around it.
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.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.