The following messages can be reported when tried to perform offline/onlining of master CB.
Aug 30 17:14:59 router chassisd[24350]: %DAEMON-3-CHASSISD_CB_MASTER_BP_IGNORED: Press of online/offline button ignored for master CB 0
Aug 30 17:44:27 router chassisd[24350]: %DAEMON-3-CHASSISD_CB_MASTER_BP_IGNORED: Press of online/offline button ignored for master CB 0
Log message will be reported.
This is expected log message when tried to offline/online master CB in a chassis.
As offlining/onlining of master CB disrupts the traffic flow/control plane activities on the router, the offlining/onling of master CB is prevented.