This is correct solution:
//in R30:
access-list 1 permit 239.130.0.0 0.0.255.255
ip pim send-rp-ann loopback1 scope 1 group-list 1
ip pim send-rp-dis loopback1 scope 2
//in R30, R31:
access-list 2 deny 239.130.0.0 0.0.255.255
access-list 2 permit any
!
int eth 0/0
ip multicast boundary 2 filter-autorp