hostname R1
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
interface Serial0
 ip address 192.168.1.1 255.255.255.0
 encapsulation frame-relay
 ip ospf network point-to-multipoint non-broadcast   //将接口类型指定为点对多点非广播
 frame-relay map ip 192.168.1.3 200
router ospf 1
 network 0.0.0.0 255.255.255.255 area 0
 neighbor 192.168.1.3    //在点对多点非广播中必须指定 neighbor
 neighbor 192.168.1.2    //可以从NBMA非广播类型跟这种类型得出一个总结:在非广播网络中必须指定邻居

R1#show ip ospf neig
Neighbor ID     Pri   State           Dead Time   Address         Interface
2.2.2.2           0   FULL/  -        00:01:42    192.168.1.2     Serial0
3.3.3.3           0   FULL/  -        00:01:42    192.168.1.3     Serial0       //在点对多点网络类型中,没有DR和BDR的选举
R1#show ip route
Gateway of last resort is not set
     1.0.0.0/32 is subnetted, 1 subnets
C       1.1.1.1 is directly connected, Loopback0
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 192.168.1.2, 00:01:08, Serial0
     3.0.0.0/32 is subnetted, 1 subnets
O       3.3.3.3 [110/65] via 192.168.1.3, 00:01:08, Serial0
     192.168.1.0/24 is variably subnetted, 3 subnets, 2 masks
C       192.168.1.0/24 is directly connected, Serial0
O       192.168.1.3/32 [110/64] via 192.168.1.3, 00:01:08, Serial0
O       192.168.1.2/32 [110/64] via 192.168.1.2, 00:01:08, Serial0
!
hostname R2
!
!
ip subnet-zero
no ip domain-lookup
!
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
interface Serial1
 ip address 192.168.1.2 255.255.255.0
 encapsulation frame-relay
 ip ospf network point-to-multipoint non-broadcast
!
router ospf 1
 network 0.0.0.0 255.255.255.255 area 0
R2#show ip ospf neig
Neighbor ID     Pri   State           Dead Time   Address         Interface
1.1.1.1           1   FULL/  -        00:01:47    192.168.1.1     Serial1
R2#show ip route
Gateway of last resort is not set
     1.0.0.0/32 is subnetted, 1 subnets
O       1.1.1.1 [110/65] via 192.168.1.1, 00:03:24, Serial1
     2.0.0.0/32 is subnetted, 1 subnets
C       2.2.2.2 is directly connected, Loopback0
     3.0.0.0/32 is subnetted, 1 subnets
O       3.3.3.3 [110/129] via 192.168.1.1, 00:03:25, Serial1
     192.168.1.0/24 is variably subnetted, 3 subnets, 2 masks
O       192.168.1.1/32 [110/64] via 192.168.1.1, 00:03:25, Serial1
C       192.168.1.0/24 is directly connected, Serial1
O       192.168.1.3/32 [110/128] via 192.168.1.1, 00:03:25, Serial1
!
hostname R3
!
interface Loopback0
 ip address 3.3.3.3 255.255.255.0
!
interface Serial0
 ip address 192.168.1.3 255.255.255.0
 encapsulation frame-relay
 ip ospf network point-to-multipoint non-broadcast
 frame-relay map ip 192.168.1.1 200
!
router ospf 1
 network 0.0.0.0 255.255.255.255 area 0

R3#show ip ospf neig
Neighbor ID     Pri   State           Dead Time   Address         Interface
1.1.1.1           1   FULL/  -        00:01:48    192.168.1.1     Serial0
R3#show ip route
Gateway of last resort is not set
     1.0.0.0/32 is subnetted, 1 subnets
O       1.1.1.1 [110/65] via 192.168.1.1, 00:05:20, Serial0
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/129] via 192.168.1.1, 00:05:21, Serial0
     3.0.0.0/24 is subnetted, 1 subnets
C       3.3.3.0 is directly connected, Loopback0
     192.168.1.0/24 is variably subnetted, 3 subnets, 2 masks
O       192.168.1.1/32 [110/64] via 192.168.1.1, 00:05:21, Serial0
C       192.168.1.0/24 is directly connected, Serial0
O       192.168.1.2/32 [110/128] via 192.168.1.1, 00:05:21, Serial0