PROBLEM: Monitor device access to the internet and create action when connection is not available (e.g. restart device).
SOLUTION: Creating IP SLA (monitor) and trigger e.g. ‘reload’ action using event manager (EEM).

[?] What is IP SLA?
https://learningnetwork.cisco.com/blogs/vip-perspectives/2017/06/13/ip-sla-fundamentals

//Create simple IP SLA with google DNS server as the target from interface FastEtheret 0/1

Router(config)# ip sla 1
Router(config-ip-sla)# icmp-echo 8.8.8.8 source-interface FastEthernet 0/1
Router(config-ip-sla)# timeout 5000
Router(config-ip-sla)# frequency 50
#Config IP sla to start now and live forever
Router(config)# ip sla schedule 1 start-time now life forever
#Track IP sla reachability
track 10 rtr 1 reachability
#On some other versions you have to use "track 1 ip sla 1 reachability"

OUTPUT

*Sep 15 13:37:00 %TRACK-6-STATE: 10 ip sla 1 srate Up -> Down

Copy & Paste

conf t
ip sla 1
icmp-echo 8.8.8.8 source-interface FastEthernet 0/1
timeout 5000
frequency 50
exit
ip sla schedule 1 start-time now life forever
track 10 rtr 1 reachability
exit

Credit: https://www.experts-exchange.com/questions/21986774/IP-addresses-may-not-be-configured-on-L2-links-on-Cisco-1801.html