I resently upgraded the OS with my 6500 sup2t.  The upgrade completed without any issues with the exception of one error.  My monitoring tool is reporting the control plane interface as being down.  I have a pair of the 6506e.  Each has dual sup2t.  Only one of the pair (6506e) is reporting an issue.  The monitoring tool is using SNMP to monitor.  I am looking for a "show" command to validate the monitoring tools alert.  ISSU and redundancy show both supervisors are working and ready to support production.