Here is the config that works
interface Cellular0/1/0ip address negotiateddialer in-banddialer idle-timeout 0dialer watch-group 1pulse-time 1ip virtual-reassemblydialer watch-list 1 ip 5.6.7.8 255.255.255.255dialer watch-list 1 delay route-check in...
This hasn't worked for any version of PI for me. The only sure fire way is to schedule a maintenance window, break your redundancy, disable the ports and bring it back online.
I've tried disabling the SNMP traps for links and Prime still picks up the downed ports and alerts on it. Does anyone know how to disable those alerts in prime?