Add the ability to create additional loopback interfaces
This is important for setting up dynamic routing protocols such as BGP, OSPF, and so on.
FreeBSD already has such functionality. This is implemented by adding lo<number> interfaces and their configuration in the /etc/rc.conf file. For example:
cloned_interfaces = "lo1"
ifconfig_lo1 = "inet a.b.c.d/prefixlen"