We have a Catalyst 2924XL with 4 port fiber module, each goes to another 2924 switch, usually port 24. I am getting this error message on the switches that are connected to the backbone switch via fiber:
%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/24 (0), with SWI01_RPCHM01.rpc.net FastEthernet1/1 (1)
Of course the interface is different with all the errors, 1/1, 1/2, 1/3, 1/4.
Whats strange about this is every port on all of the switches are assigned to VLAN 1, the default VLAN. I did a show vlan and everything looks fine.