HELP! Nion6 CM-1 Primary/Secondary with CISCO switches

Hello,

In a large installation with 30 NION apron and some CAB 4N, we found that some of them had the network port blocked. After some studies we detected that Primary and Secondary Cobranet ports share the same MAC Address.

The CISCO switches detects a MAC Address is changing from one port to another and for security reasons (MAC Flapping) blocks the ports. Network staff of this installation don't know how to resolve.

The urgent solution is unplug secondary port and be sure that the whole system is running.
But I need a better solution. Somebody knows how to configure CISCO for NION ? or can tell me a solution for that problem ?

Thanks.