R3#sh run | b ip pim send
ip pim send-rp-announce FastEthernet0/1 scope 2 group-list 1
!
!
access-list 1 deny   224.20.68.1
access-list 1 permit any
!



R3#sh ip pim rp map
PIM Group-to-RP Mappings
This system is an RP (Auto-RP)

Group(s) 224.0.0.0/4
  RP 180.40.7.129 (?), v2v1
    Info source: 180.40.7.2 (?), elected via Auto-RP
         Uptime: 00:09:54, expires: 00:02:55
Group(s) (-)224.20.68.1/32
  RP 180.40.7.129 (?), v2v1
    Info source: 180.40.7.2 (?), elected via Auto-RP
         Uptime: 00:12:54, expires: 00:02:56
R3#