R1#sh run | b router
router eigrp 100
 network 180.40.7.66 0.0.0.0
 network 208.28.1.66 0.0.0.0
 neighbor 180.40.7.65 Serial0/0.2
 auto-summary
!
R2#sh run | b router
router eigrp 100
 network 180.40.7.65 0.0.0.0
 network 208.28.1.129 0.0.0.0
 neighbor 180.40.7.66 Serial1/0.2
 auto-summary
!
S5#sh run | b router
router eigrp 100
 network 208.28.1.65 0.0.0.0
 network 208.28.1.130 0.0.0.0
 auto-summary
!