Nat Pool : R14 & R15, R24 & R25
Multicast another variation :

SW100#show ip pim rp mapping
PIM Group-to-RP Mappings
This system is an RP (Auto-RP)
This system is an RP-mapping agent
Group(s) 239.250.0.0/16 RP 10.250.250.250 (DC1-RP), v2v1
Info source: 10.250.250.250 (?), elected via Auto-RP
Uptime: 01:46:57, expires: 00:01:59


R10/R11/R20/R21/R14/R15
conf t
ip prefix-list FILTER seq 5 permit 10.0.0.0/13 ge 16 le 16
ip prefix-list FILTER seq 10 permit 0.0.0.0/0