R1#sh run | b inter
!
interface Serial0/0.2 point-to-point
 ip address 180.40.7.66 255.255.255.224
 ip pim sparse-dense-mode
 ip multicast helper-map 225.55.55.55 17.100.1.255 100
 ip ospf network point-to-multipoint
 frame-relay interface-dlci 102
!
interface Ethernet0/1
 ip address 17.100.1.1 255.255.255.0
 ip directed-broadcast
 ip pim query-interval 90
 ip pim sparse-dense-mode
 ip igmp query-interval 90
 half-duplex
 no keepalive


access-list 100 permit udp any host 225.55.55.55 eq tftp
!


R2#sh run | b dhcp
ip dhcp pool Prob13
   host 180.40.7.97 255.255.255.224
   hardware-address 0013.80e2.0000
   default-router 180.40.7.87
!
!
!
interface FastEthernet0/1
 ip address 180.40.7.98 255.255.255.224
 ip pim sparse-dense-mode
 ip multicast helper-map broadcast 225.55.55.55 100
 duplex auto
 speed auto
!


Debug IP Pack & ip mpack on R1

*Mar  1 11:10:51.278: IP: tableid=0, s=180.40.7.97 (Serial0/0.2), d=17.100.1.255 (Ethernet0/1), routed via RIB
*Mar  1 11:10:51.278: IP(0): s=180.40.7.97 (Serial0/0.2) d=225.55.55.55 id=3, prot=17, len=44(40), mroute olist null
*