This sets the BOOTP/DHCP relay's maximum hops forwarding
limit. If a BOOT/DHCP frame arrives with hopcount greater
than or equal to vIPRouterRelayParam1, it will be dropped.
For BOOTP/DHCP the legal range is 1..16. For
Generic services, this sets the port number to be
forwarded. The legal range is -1..65535 with -1 indicating
the unset state.