By default cisco switch ports use Ethernet autonegotiation to determine duplex and speed settings.
Cisco switches detect the speed setting by using the Fast Link Pulses which is part of the autonegotiation process. However if the speed is manually entered on the other end of the link, the speed is detected based on the incoming electrical signal. Well, that means you do not need cdp for speed detection.
For duplex setting, both ends of the link must be configured to auto-negotiate. If one end is manually set to full/hall duplex, the other end cannot negotiate the duplex speed and assume the default setting depending on the ethernet connection type. (Half-duplex for 10/100mbps, full-duplex for 1000mbps)
This ability does not depend on CDP. But to detect any mismatch between two cisco devices, you need cdp enabled.
If I remember correctly, autonegotiate is a hardware standard feature of (copper) FastEthernet and GigEthernet. It doesn't require CDP. For original Ethernet, autonegotiate may not be found on older equipment and might not function as desired, if available, on original Ethernet.
CDP can "flag" duplex mismatch, although with switches and devices connected to them, the error can be invalid between different devices connected to the switch.
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.