Sandaruwan,  Are you seeing anything in the CMC log about the CMC's failing over? Normally this is seen when one of the CMC's is removed, has failed, or has mismatched firmware. It can also be network configuration. Could you confirm if either the active or standby CMC mgmt ports are set as tagged, as well as what their speed is configured to?  If they are set to Auto, would you try setting both to 100MB and Full Duplex then enable each CMC and see if the error persists. Let me know what you see. Thank you.
recently i have configured dell vrtx server for our client. but there is a issue with CMC card. in the cmc login interface, display some critical alert called  "vrtx chassis management controller (cmc) redundancy is lost". both cmc firmware updated to latest version (2.23).  one cmc card in active state and other one is in standby state. but still display that alert. i need know this is error or just a alert. so please help me to resolve this issue.  
vrtx chassis management controller (cmc) redundancy is lost