R1:
int lo 0
ip add 1.1.1.1 255.255.255.0
int serial 0/0
no ip address
no shutdown
encapsulation frame-relay
no frame-relay inverse-arp
int serial 0/0.1 multipoint
ip address 192.1.1.1 255.255.255.0
ip ospf network point-to-multipoint
frame-relay map ip 192.1.1.2 102 broadcast
frame-relay map ip 192.1.1.3 103 broadcast
router ospf 1
router-id 1.1.1.1
network 1.1.1.0 0.0.0.255 area 0
network 192.1.1.0 0.0.0.255 area
R2:
int lo 0
ip add 2.2.2.2 255.255.255.0
int serial 0/0
ip add 192.1.1.2 255.255.255.0
no shutdown
encapsulation frame-relay
ip ospf network point-to-multipoint
frame-relay map ip 192.1.1.1 201 broadcast
no frame-relay inverse-arp
router ospf 1
router-id 2.2.2.2
network 2.2.2.0 0.0.0.255 area 0
network 192.1.1.0 0.0.0.255 area 0
R3:
int lo 0
ip add 3.3.3.3 255.255.255.0
int serial 0/0
ip add 192.1.1.3 255.255.255.0
no shut
encapsulation frame-relay
ip ospf network point-to-multipoint
frame-relay map ip 192.1.1.1 301 broadcast
no frame-relay inverse-arp
router ospf 1
router-id 3.3.3.3
network 3.3.3.0 0.0.0.255 area 0
network 192.1.1.0 0.0.0.255 area 0
R4：
frame-relay switchint
int serial 0/0
no ip address
no shut
encapsulation frame-relay
frame-relay intf-type dce
clock rate 64000
frame-relay route 102 interface serial 0/1 201
frame-relay route 103 interface serial 0/2 301
int serial 0/1
no ip address
no shut
encapsulation frame-relay
frame-relay intf-type dce
frame-relay route 201 interface serial 0/0 102
int serial 0/2
no ip address
no shut
encapsulation frame-relay
frame-relay intf-type dce
frame-relay route 301 interface serial 0/0 103
