In SONiC the DHCP option 82 is enabled by default, following a patch added to the isc-dhcp relay package.
You can check the implementation here:
When starting the DHCP docker with the daemon for DHCP relay the J2 template will generate a dhcpd instance with this option, you can see it here:
You can check the CLI reference for how to use the DHCP relay from host perspective, since starting the application from the host will not work as expected, SONiC CLI commands are required for it will start the service and the application within the docker.
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