i would like to know over what vlan are cdp packets send. Actually i had a layer 2 network in wich i change the native vlan in the trunks. The 2950 saw each other and saw the 3550 too trough that trunks, but the 3550 can't saw any of the 2950 but the 2950 can saw it. I have debug cdp and the packets are sent correctly by the 2950 and by the 3550, they share a trunk and the native vlan is correctly configured in both sides, but the 3550 doesn´t receive that packets???
So, if vlan1 is always used to send CDPs even if it's not the native vlan and it has been cleared from the trunk why the 3550 doesn't see the 2950 if it has not vlan1 allowed in its side of the trunk but
saw it if i allow vlan1 in the 3550 side of the trunk, considering that, in both cases, vlan1 is not allowed in the 2950 side of the trunk and that each 2950 saw others 2950 having disallowed vlan1 in both sides of the trunk beetwen them.
Maybe a bug with the 3550 ios version 12.1(12c)EA1?
"If VLAN 1 or VLANs 1002 to 1005 are removed from a trunk port, the switch no longer receives CDP or VTP frames. VLAN 1 minimization is not supported on the Catalyst 3550 switch. You cannot remove VLAN 1 or VLANs 1002 to 1005 from the allowed VLAN list. (CSCdz22629)"
See Release Notes for the Catalyst 3550 Multilayer Switch Cisco IOS Release 12.1(12c)EA1.
(Unfortunately, using Bug Toolkit and searching "3550 CDP" doesn't show this bug, you have to use searching by bug ID.)
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