Using an ISP as a backup network

[buzzhani1]

I have a cisco 1900 series router and two modems from two different ISPs; i also have 24-port switch connecting some ubiquiti access points to the network. The configuration i want to achieve is to have one of the ISPs as the primary network and if for any reason their link fails, the other ISP picks up automatically. So what i want is a backup network in some sense. I've read online about BGP being a possible solution but i don't even know where to start. Are there alternatives to using BGP? Please how do i achieve this?

Thanks in advance.

[buzzhani1]

Thanks. You are actually correct. Because running ip route 0.0.0.0 0.0.0.0 192.168.1.1 or (using the public IP in place of 192.168.1.1) gives an error saying: invalid next hop address, [it's the router]

And after running ip route 0.0.0.0 0.0.0.0 <LAN IP of backup ISP> 100. There's still no failover when the primary link fails. show ip route still gives the same results.

"What you should do is find out the WAN IP of your ISP router... and put a static route in for that."

Will this be the WAN IP of the primary or backup ISP...?

Also there's no empty GE port on the router. I'm having to connect the backup modem to the router via a switch. Will it still work? Or do i need to connect it via the ehiwic port..?

Thanks.