We have a customer with Cat6500 VSS chassis configured with Etherchannel 802.1Q-in-Q links between Edge & Distribution switches. The distribution end of the link is configured as an IEEE802.1Q tunnel port whilst the Edge end of the link is an IEEE802.1Q trunk port (assymmetrical link).
CDP is automatically disabled for this configuration so link status on campus manager doesn't work correctly. If we enable CDP on the links then we get "native vlan mismatch" error messages. Is there a way around this other than filtering/ignoring the messages?