Add A Network Device to Icinga2 Monotring

Hi Team,

I am New TO ICINGA2 , we installed Icinga2 recently and we are able to add the Windows and Linux Servers.

We want to add the Our Network Devices like Switch,Firewall, Router,etc, and we want to collect utilazation reports also we want’s to capture bandwidth utilazitation report also.

1.How i can add My networkdevices to ICINGA2, using SNMP or any Agesnt need to confire in Network device side.
2. Any Posibility to add the using Icinga Director
Kindly provide reference links to add Network device using SNMP and Icinaga2 Director.