Packet Tracer lab example
R1
interface Serial0/0/0
ip address 192.168.1.1 255.255.255.0
encapsulation frame-relay
frame-relay map ip 192.168.1.2 102 broadcast
frame-relay map ip 192.168.1.3 103 broadcast
R2
interface Serial0/0/0
ip address 192.168.1.2 255.255.255.0
encapsulation frame-relay
frame-relay map ip 192.168.1.1 201 broadcast
frame-relay map ip 192.168.1.3 203 broadcast
R3
interface Serial0/0/0
ip address 192.168.1.3 255.255.255.0
encapsulation frame-relay
frame-relay map ip 192.168.1.2 302 broadcast
frame-relay map ip 192.168.1.1 301 broadcast
Frame-Relay SW
frame-relay switching
!
interface Serial0/1
no ip address
encapsulation frame-relay
clockrate 64000
frame-relay intf-type dce
frame-relay route 102 interface Serial0/2 201
frame-relay route 103 interface Serial0/3 301
!
interface Serial0/2
no ip address
encapsulation frame-relay
clockrate 64000
frame-relay intf-type dce
frame-relay route 201 interface Serial0/1 102
frame-relay route 203 interface Serial0/3 302
!
interface Serial0/3
no ip address
encapsulation frame-relay
clockrate 64000
frame-relay intf-type dce
frame-relay route 301 interface Serial0/1 103
frame-relay route 302 interface Serial0/2 203