D-link dfl860e setup of two providers. How?

Question

Computer networks

There are two providers in this route. It is necessary to set up a channel reservation on it, but so that when the Internet is disconnected from the provider, the Internet gateway only changes to another provider. That is, so that the local resources of both providers always remain available. The connection type for both is a static address.

Answer 1

Everything is quite simple.
We go to the routing settings and open the main table.
The main route ( wan1 = isp 1 ) must have a metric of 100
The additional (wan2 = isp2) must have a metric of 110
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Create another routing table and call it Failover
Inside, create rules
Type_Interf_Network____Gateway_____
Local.ip_Metric_Monitoring 80\yes\
Route \wan2 \all-nets\wan2_gw\wan2_ip\80\no
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Save and activate them.
The required traffic rules must be present.

Answer 2

I understand it. I need help not in routes, but in setting up the channel reservation. that is, if the main provider lost the Internet, I need to change the Default Gateway, but both providers remain available. I can do it manually by substituting the main gateway of another provider, but I can’t figure out how to do it automatically.