The cellular port operational state can be specified as a failover criterion for the currently active SIM. The operational state of cellular port 1/1/1 is used as the failover criterion for SIM 1 and the operational state of cellular port 1/1/2 is used as the failover criterion for SIM 2.
When the cellular port operational state criterion is specified, the system monitors the operational state of the PDN. If the PDN is operationally down for a specified failure-duration, the system performs a SIM failover and attempts to establish cellular service using the other SIM. See Failure duration for more information.