Back to back Frame Relay
Without "no keepalive", it won't work.
Router1:
interface Serial0
no ip address
encapsulation frame-relay
no keepalive
!--- This command disables LMI processing.
clock rate 64000
!
interface Serial0.1 point-to-point
!--- A point-to-point subinterface has been created.
ip address 172.16.120.105 255.255.255.0
frame-relay interface-dlci 101
!--- DLCI 101 has been assigned to this interface
!
Router2:
interface Serial0
no ip address
encapsulation frame-relay
no keepalive
!--- This command disables LMI processing.
!
interface Serial0.1
point-to-point
!--- A point-to-point subinterface has been created.
ip address 172.16.120.120 255.255.255.0
frame-relay interface-dlci 101
!--- DLCI 101 has been assigned to this interface
!