Multicast
In order to influence Multicast RPF lookup, it is possible to insert into zebra routes for the Multicast RIB. These routes are only used for RPF lookup and will not be used by ZEBRA for insertion into the kernel or for normal RIB processing. As such it is possible to create weird states with these commands.
Use with caution. Most of the time this will not be necessary.
Insert into the Multicast RIB Route <subnet> with specified next-hop. The distance can be specified as well if desired.
Do not install route for <subnet> into the Multicast RIB.
Insert into the Multicast RIB Route <subnet> with specified <interface>. The distance can be specified as well if desired.