Configure SIM-switch based on link health

FortiExtender enables you to configure automatic SIM switch based on the link health.

For more information, refer to the CLI Reference Guide.

To use this feature:

1. Configure an hmon hchk instance:

   config hmon hchk
       edit sim-health
           set protocol ping
           set interval 10
           set probe-cnt 1
           set probe-tm 2
           set probe-target 166.253.42.211
           set interface lte1
           set src-type none
           set filter loss
       next
   end
   		 

2. Link the auto-switch instance to the config hmon hchk instance:

   FX511FTQ21001152 # config lte setting modem1 auto-switch

   FX511FTQ21001152 (auto-switch) # show

   config lte setting modem1 auto-switch

   set by-disconnect disable

   set by-signal disable

   set by-data-plan disable

   set by-health-monitor enable

   config health-monitor

   set event sim-health

   set fail-cnt 3

   set recovery-cnt 2

   set by-latency enable

   set latency-threshold 150

   set by-jitter enable

   set jitter-threshold 150

   set recover-by-reboot enable

   set max-switches-allowed 4

   set max-switches-interval 1800

   end

Parameter	Description
event sim-health	"sim-health" refers to the config hmon hchk instance above.
fail-cnt 3	The link is deemed unusable if three pings have failed.
recovery-cnt 2	The link is considered usable if two pings have succeeded.
by-latency	Enable/Disable latency monitoring on the active SIM card.
latency-threshold	Latency in milliseconds for SLA to make decisions.
by-jitter	Enable/Disable jitter monitoring on the active SIM card.
jitter-threshold	Jitter in milliseconds for SLA to make decisions.
recover-by-reboot [disable|enable]	Enable/Disable. If enabled, the system will reboot if the following two conditions are met: max-switches-allowed max-switches-interval See below.
max-switches-allowed 5	5 switches
max-switches-interval 1800	Within 1,800 seconds