If CDP is enabled on both ports and if both switches do not see the other as a CDP neighbor then I believev that it may indicate that there is some layer 2 issue in the connection of these ports. If there is a layer 2 issue then not seeing each other as neighbors would probably mean that there was a problem and other kinds of data might not be able to be forwarded over this connection.
As a starting point could you post the output of show port of both switches. It might also be helpful if you would post the configuration of both ports.
I had some similar problem with CDP on 650x and trunk links. Mainly the problem is related to CDP that communicates only using VLAN 1, so if the VLAN 1 is removed form the trunk the CDP works oddly.
I didn't have any experience between 650x and 3750, but between 6506 and 7200 router, the CDP neighbor command show a correct result, except the 6506 IP address that is 127.0.0.12, the SPV internal loopback address.
The only workaround is to enable VLAN 1 on trunk.
If you cannot do it due to spanning tree issues, you must substitute the use of VLAN 1 with another VLAN, but is a hard job.
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.