R1#sh run int e 0/1
Building configuration...

Current configuration : 258 bytes
!
interface Ethernet0/1
 ip address 17.100.1.1 255.255.255.240
 ip pim query-interval 90
 ip pim sparse-dense-mode
 ip multicast ttl-threshold 255
 ip multicast helper-map 226.1.1.1 17.100.1.255 101
 ip igmp query-interval 90
 half-duplex
 no keepalive
end

R1#sh run | i access-list 101
access-list 101 permit udp any any eq tftp
R1#

R2#sh run int fa 0/1
Building configuration...

Current configuration : 173 bytes
!
interface FastEthernet0/1
 ip address 180.40.7.98 255.255.255.224
 ip pim sparse-dense-mode
 ip multicast helper-map broadcast 226.1.1.1 100
 duplex auto
 speed auto
end

R2#sh run | i access-list 100
access-list 100 permit udp any any eq tftp
R2#