通过桥接技术使OSPF运行在帧中继

试验目的：

通过桥接技术使OSPF运行在FR网络上的行为相当于在以太网。 

试验拓扑：

配置：

R1：

1. bridge irb
2. !
3. interface Loopback0
4.  ip address 1.1.1.1 255.255.255.0
5. !
6. interface Serial1/0.102 multipoint
7.  frame-relay map bridge 102 broadcast
8.  bridge-group 1
9. !
10. interface Serial1/0.103 multipoint
11.  frame-relay map bridge 103 broadcast
12.  bridge-group 1
13. interface BVI1
14.  ip address 192.168.23.1 255.255.255.0
15.  ip ospf priority 4
16. !
17. router ospf 100
18.  router-id 1.1.1.1
19.  log-adjacency-changes
20.  network 1.1.1.0 0.0.0.255 area 0
21.  network 192.168.23.0 0.0.0.255 area 0
22. !
23. bridge 1 protocol ieee
24. bridge 1 route ip

R2：

1. bridge irb
2. !
3. interface Loopback0
4.  ip address 2.2.2.2 255.255.255.0
5. !
6. interface Serial1/0
7.  no ip address
8.  encapsulation frame-relay
9.  serial restart-delay 0
10.  frame-relay map bridge 201 broadcast
11.  bridge-group 1
12. !
13. interface BVI1
14.  ip address 192.168.23.2 255.255.255.0
15.  ip ospf priority 0
16. !
17. router ospf 100
18.  router-id 2.2.2.2
19.  log-adjacency-changes
20.  network 2.2.2.0 0.0.0.255 area 0
21.  network 192.168.23.0 0.0.0.255 area 0
22. !
23. bridge 1 protocol ieee
24. bridge 1 route ip

R3：

1. bridge irb
2. !
3. interface Loopback0
4. ip address 3.3.3.3 255.255.255.0
5. !
6. interface Serial1/0
7. no ip address
8. encapsulation frame-relay
9. serial restart-delay 0
10. frame-relay map bridge 301 broadcast
11. bridge-group 1
12. !
13. interface BVI1
14. ip address 192.168.23.3 255.255.255.0
15. ip ospf priority 0
16. !
17. router ospf 100
18. router-id 3.3.3.3
19. log-adjacency-changes
20. network 3.3.3.0 0.0.0.255 area 0
21. network 192.168.23.0 0.0.0.255 area 0
22. !
23. bridge 1 protocol ieee
24. bridge 1 route ip 

验证：

通过上图可看出R1是ROOT

总结：通过上面的分析可以看出OSPF在桥接组中的行为相当于以太网，这样就省去了OSPF在FR路由的麻烦。