interface lo
 ip pim
 ip pim use-source 10.254.254.3
!
interface r3-eth0
 ip pim
!
interface r3-eth1
 ip pim
 ip igmp
!
ip pim join-prune-interval 5
ip pim rp 10.254.254.3
ip msdp timers 10 20 3
ip msdp mesh-group mg-1 source 10.254.254.3
ip msdp mesh-group mg-1 member 10.254.254.1
ip msdp mesh-group mg-1 member 10.254.254.2