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.
Proposed CLI commands
set protocols static multicast interface-route 239.0.0.0/24 next-hop-interface 'eth0' set protocols static multicast interface-route 239.0.0.0/24 next-hop-interface 'eth1' distance 10 set protocols static multicast route 239.0.1.0/24 next-hop '192.168.255.10' set protocols static multicast route 239.0.1.0/24 next-hop '192.168.255.11' distance 20