帧中继承载OSPF- 点对多点 非广播(Point-to-Multipoint No-broadcast)
目标：
在R1，R4和R5之间的帧中继网络中配置OSPF，网络类型为point-to-multipoint non-broadcast，实现VLAN A, VLAN B和VLAN C的互通。任何链路都不能配置广播支持。
配置指南：
• 在R1上配置接口Ethernet0/0地址为1.0.0.1/8
• 在R4上配置接口Ethernet0/0地址为4.0.0.4/8
• 在R5上配置接口Ethernet0/0地址为5.0.0.5/8
• 在R1上配置接口Seria0/0地址为10.0.0.1/8
• 在R4上配置接口Serial0/0地址为10.0.0.4/8
• 在R5上配置接口Serial0/0地址为10.0.0.5/8
• 在R1,R4和R5的Serial接口上配置帧中继封装
• 在R4和R5上禁用帧中继反向地址解析
• 在R1上配置静态映射，通过DCLI104到10.0.0.4和通过DLCI105到10.0.0.5
• 在R4上配置静态映射，通过DLCI401到10.0.0.1
• 在R5上配置静态映射，通过DLCI501到10.0.0.1
• R4和R5之间不配置静态映射
• 在R1, R4, 和R5的Serial接口上配置OSPF网络类型为point-to-multipoint non-broadcast
• 配置R1, R4和R5中所有接口加入area 0
• 在R1上配置对R4和R5的邻居命令
自我提问：
• point-to-multipoint non-broadcast的网络类型和其他网络类型有什么不同?
• point-to-multipoint non-broadcast和point-to-multipoint有什么相似的?
• 这种类型对三层到二层的解析产生什么影响?
最终配置和验证：
R1:
interface Ethernet0/0
ip address 1.0.0.1 255.0.0.0
!
interface Serial0/0
ip address 10.0.0.1 255.0.0.0
encapsulation frame-relay
ip ospf network point-to-multipoint non-broadcast
frame-relay map ip 10.0.0.4 104
frame-relay map ip 10.0.0.5 105
!
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
neighbor 10.0.0.5
neighbor 10.0.0.4
R4:
interface Ethernet0/0
ip address 4.0.0.4 255.0.0.0
!
interface Serial0/0
ip address 10.0.0.4 255.0.0.0
encapsulation frame-relay
ip ospf network point-to-multipoint non-broadcast
frame-relay map ip 10.0.0.1 401
no frame-relay inverse-arp
!
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
R5:
interface Ethernet0/0
ip address 5.0.0.5 255.0.0.0
!
interface Serial0/0
ip address 10.0.0.5 255.0.0.0
encapsulation frame-relay
ip ospf network point-to-multipoint non-broadcast
frame-relay map ip 10.0.0.1 501
no frame-relay inverse-arp
!
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
R1#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.0.0.5 1 FULL/ - 00:01:49 10.0.0.5 Serial0/0
10.0.0.4 1 FULL/ - 00:01:49 10.0.0.4 Serial0/0
R4#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.0.0.1 1 FULL/ - 00:01:47 10.0.0.1 Serial0/0
R5#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.0.0.1 1 FULL/ - 00:01:56 10.0.0.1 Serial0/0
R1#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
C 1.0.0.0/8 is directly connected, Ethernet0
O 4.0.0.0/8 [110/74] via 10.0.0.4, 00:56:28, Serial0
O 5.0.0.0/8 [110/74] via 10.0.0.5, 00:56:28, Serial0
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
C 10.0.0.0/8 is directly connected, Serial0
O 10.0.0.4/32 [110/64] via 10.0.0.4, 00:56:28, Serial0
O 10.0.0.5/32 [110/64] via 10.0.0.5, 00:56:28, Serial0
R4#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
O 1.0.0.0/8 [110/74] via 10.0.0.1, 00:00:47, Serial0
C 4.0.0.0/8 is directly connected, Ethernet0
O 5.0.0.0/8 [110/138] via 10.0.0.1, 00:00:47, Serial0
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
C 10.0.0.0/8 is directly connected, Serial0
O 10.0.0.1/32 [110/64] via 10.0.0.1, 00:00:47, Serial0
O 10.0.0.5/32 [110/128] via 10.0.0.1, 00:00:47, Serial0
R5#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
O 1.0.0.0/8 [110/74] via 10.0.0.1, 00:58:35, Serial0
O 4.0.0.0/8 [110/138] via 10.0.0.1, 00:58:35, Serial0
C 5.0.0.0/8 is directly connected, Ethernet0
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
C 10.0.0.0/8 is directly connected, Serial0
O 10.0.0.1/32 [110/64] via 10.0.0.1, 00:58:35, Serial0
O 10.0.0.4/32 [110/128] via 10.0.0.1, 00:58:35, Serial0
R4#ping 10.0.0.5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.0.5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 116/118/128 ms
R4#ping 5.0.0.5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 5.0.0.5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 116/118/128 ms
注解：
point-to-multipoint non-broadcast和point-to-multipoint非常相像，不支持DR/BDR选举，相同的下一跳处理等，唯一的不同就是使用单播而不是组播。
更多内容请看PCdog.com--OSPF路由协议 OSPF协议 OSPF协议配置专题
