SIM-switch
FortiExtender comes with two SIM-card slots, with the first one (i.e., sim1) being the default. SIM-switch is a default feature which works only when you have two SIM cards installed on a FortiExtender device. That way, FortiExtender automatically switches to sim2 to maintain the current LTE connection when any of the following situations occurs:
- An Internet session gets disconnected. By default, FortiExtender automatically switches to sim2 if sim1 gets disconnected for three times within 600 seconds. You can change the values using the following commands:
config lte setting modem1
set disconnect-threshold <3> /*Number of disconnects for sim-switch*/
set disconnect-period <600> /*Disconnect evaluation period for sim-switch*/
end
- Data usage has exceeded the set limit of your data plan and overage is disabled. By default, overage is disabled. SIM-switch does not occur if overage is enabled. You can use the following commands to set the capacity of your data plan and enable or disable overage:
config lte plan
edit <plan>
set carrier <carrier_name>
set capacity <data plan in MB>
set billing-date <billing date>
set overage {enable | disable}
set signal-threshold <-100> /*RSSI to be evaluated*/
set signal-period <600> /*Signal evaluation time in seconds*/
next
- The relative signal (RSSI value) stays lower than the specified value for a major part of the time period defined. By default, the RSSI value is -100, and the time period is 600 seconds. This means that SIM-switch occurs if the RSSI value stays below -100 for more than 300 seconds.
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SIM-switch is a feature in data plan configuration which can can be configured from FortiExtender Cloud and/or locally from the GUI. It can't be configured in FortiGate. All the three aforementioned parameters can be configured from the FortiExtender CLI. |