This is no support for broadcast on the multipoint interfaces


R1#sh run | b router
router eigrp 100
 network 17.57.100.1 0.0.0.0
 network 208.28.1.1 0.0.0.0
 neighbor 208.28.1.2 Serial0/0.1
 distribute-list 1 in Serial0/0.1
 no auto-summary
!
!
access-list 1 deny   17.57.0.0 0.0.255.255
access-list 1 deny   208.28.1.0 0.0.0.255
access-list 1 permit any
!


R2#sh run | b router
router eigrp 100
 network 2.2.2.2 0.0.0.0
 network 208.28.1.3 0.0.0.0
 neighbor 208.28.1.2 Serial1/0.1
 distribute-list 1 in Serial1/0.1
 no auto-summary
!
access-list 1 deny   2.2.2.0 0.0.0.255
access-list 1 deny   208.28.1.0 0.0.0.255
access-list 1 permit any
!


R3#sh run | b router
router eigrp 100
 network 17.80.1.1 0.0.0.0
 network 208.28.1.2 0.0.0.0
 neighbor 208.28.1.3 Serial1/0
 neighbor 208.28.1.1 Serial1/0
 no auto-summary
!

R3#sh run int s 1/0
Building configuration...

Current configuration : 229 bytes
!
interface Serial1/0
 ip address 208.28.1.2 255.255.255.248
 encapsulation frame-relay
 no ip split-horizon eigrp 100
 no fair-queue
 frame-relay map ip 208.28.1.1 301 
 frame-relay map ip 208.28.1.3 302
end