实验拓扑：
实验步骤：
配置FR帧中继：
FR(config)#frame-relay switching
FR(config)#in
FR(config)#interface s1/2
FR(config-if)#encapsulation frame-relay
FR(config-if)#frame-relay intf-type dce
FR(config-if)#
FR(config-if)#
FR(config-if)#frame-relay route 102 interface s1/3 201
FR(config-if)#
00:04:22: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to down
FR(config-if)#exit
FR(config)#in
FR(config)#interface s1/3
FR(config-if)#no shu
FR(config-if)#encapsulation frame-relay
FR(config-if)#frame-relay intf-type dce
FR(config-if)#frame-relay route 201 interface s1/2 102
FR(config-if)#exit
00:05:35: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/3, changed state to down
FR(config)#
R2和R3的配置：
R2(config)#interface s1/2
R2(config-if)#no shu
00:07:02: %LINK-3-UPDOWN: Interface Serial1/2, changed state to up
00:07:03: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/2, changed state to up
R2(config-if)#ip add 21.1.1.1 255.255.255.0
R2(config-if)#
R2(config-if)#encapsulation frame-relay
R2(config-if)#no frame-relay inverse-arp
R2(config-if)#frame-relay map ip 21.1.1.2 102 b
R2(config-if)#exit
R2(config)#in
R2(config)#interface lo0
R2(config-if)#ip add 2.2.2.2 255.255.255.0
R2(config-if)#exit
R2(config)#
R2(config)#router os 100
R2(config-router)#router
R2(config-router)#router-id 2.2.2.2
R2(config-router)#net 21.1.1.0 0.0.0.255 a 8
R2(config-router)#net
R2(config-router)#network 2.2.2.0 0.0.0.255 a 8
R2(config-router)#exit
R3(config)#interface s1/3
R3(config-if)#no shu
R3(config-if)#
R3(config-if)#ip add 21.1.1.2 255.255.255.0
R3(config-if)#
00:08:32: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/3, changed state to down
R3(config-if)#encapsulation frame-relay
R3(config-if)#no frame-relay inverse-arp
R3(config-if)#frame-relay map ip 21.1.1.1 201 b
R3(config-if)#exit
R3(config)#interface lo0
R3(config-if)#ip add 3.3.3.3 255.255.255.0
R3(config-if)#exit
R3(config)#router os 100
R3(config-router)#router
R3(config-router)#router-id 3.3.3.3
R3(config-router)#net 3.3.3.0 0.0.0.255 a 8
R3(config-router)#net 21.1.1.0 0.0.0.255 a 8
R3(config-router)#exit
第一种默认为：Non_Broadcast
在R2上show ip ospf neighbor，发现没有邻居。说明在这种情况下邻居需要手动配置！配置如下：
R2(config)#router os 100
R2(config-router)#ne
R2(config-router)#nei
R2(config-router)#neighbor 21.1.1.2
R2(config-router)#exit
R3(config)#router os 100
R3(config-router)#nei
R3(config-router)#neighbor 21.1.1.1
00:18:02: %OSPF-5-ADJCHG: Process 100, Nbr 2.2.2.2 on Serial1/3 from LOADING to FULL, Loading Done
R3(config-router)#neighbor 21.1.1.1
R3(config-router)#exit
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发现有DR和BDR的选举，DR为R3
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R3(config)#exit
R2#show ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
3.3.3.3 1 FULL/DR 00:01:49 21.1.1.2 Serial1/2
R2#show ip ospf interface
Loopback0 is up, line protocol is up
Internet Address 2.2.2.2/24, Area 8
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默认情况
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Loopback interface is treated as a stub Host
Serial1/2 is up, line protocol is up
Internet Address 21.1.1.1/24, Area 8
Process ID 100, Router ID 2.2.2.2, Network Type NON_BROADCAST, Cost: 64
Transmit Delay is 1 sec, State BDR, Priority 1
Designated Router (ID) 3.3.3.3, Interface address 21.1.1.2
Backup Designated router (ID) 2.2.2.2, Interface address 21.1.1.1
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
Hello due in 00:00:04
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 3.3.3.3 (Designated Router)
Suppress hello for 0 neighbor(s)
第二种Point-to-Multipoint（Non_Broadcast）
在R2和R3上修改类型：
R2(config)#interface s1/2
R2(config-if)#ip ospf network point-to-multipoint non-broadcast
R3(config)#interface s1/3
R3(config-if)#ip ospf network point-to-multipoint non-broadcast
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Neighbor ID Pri State Dead Time Address Interface
3.3.3.3 1 FULL/ - 00:01:45 21.1.1.2 Serial1/2
这种类型也需手动指定邻居，但没有DR和BDR的选举
R2#show ip ospf interface
Serial1/2 is up, line protocol is up
Internet Address 21.1.1.1/24, Area 8
Process ID 100, Router ID 2.2.2.2, Network Type POINT_TO_MULTIPOINT, Cost: 64
Transmit Delay is 1 sec, State POINT_TO_MULTIPOINT,
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
Hello due in 00:00:00
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 3.3.3.3
Suppress hello for 0 neighbor(s)
Loopback0 is up, line protocol is up
Internet Address 2.2.2.2/24, Area 8
Process ID 100, Router ID 2.2.2.2, Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
第三种广播(broadcast)
删除R2和R3上的邻居，并修改网络类型为broadcast
R2(config)#router ospf 100
R2(config)#router ospf 100
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说明广播型不要手动指定邻居，会自动学习。
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R2(config)#interface s1/2
R2(config-if)#ip ospf network broadcast
R2(config)#
R2(config)#
00:48:26: %OSPF-5-ADJCHG: Process 100, Nbr 3.3.3.3 on Serial1/2 from LOADING to FULL, Loading Done
R2(config)#
R3(config)#router ospf 100
R3(config-router)#no neighbor 21.1.1.1
R3(config-router)#exit
R3(config)#interface s1/3
R3(config-if)#ip ospf network broadcast
R3(config-if)#
00:45:56: %OSPF-5-ADJCHG: Process 100, Nbr 2.2.2.2 on Serial1/3 from LOADING to FULL, Loading Done
R2#show ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
3.3.3.3 1 FULL/BDR 00:00:33 21.1.1.2 Serial1/2
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有DR和BDR的选举
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R2#show ip ospf interface
Serial1/2 is up, line protocol is up
Internet Address 21.1.1.1/24, Area 8
Process ID 100, Router ID 2.2.2.2, Network Type BROADCAST, Cost: 64
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 2.2.2.2, Interface address 21.1.1.1
Backup Designated router (ID) 3.3.3.3, Interface address 21.1.1.2
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:00
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 3.3.3.3 (Backup Designated Router)
Suppress hello for 0 neighbor(s)
Loopback0 is up, line protocol is up
Internet Address 2.2.2.2/24, Area 8
Process ID 100, Router ID 2.2.2.2, Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
第四种Point-to-Point
在R2和R3上修改网络类型为Point-to-Point
R3(config)#interface s1/3
R3(config-if)#ip ospf network point-to-p
R2(config)#interface s1/2
R2(config-if)#ip ospf network point-to-point
查看
R2#show ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
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说明这种类型不需要手动指定邻居，但没有DR和BDR的选举
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R2#show ip ospf in
R2#show ip ospf interface
Serial1/2 is up, line protocol is up
Internet Address 21.1.1.1/24, Area 8
Process ID 100, Router ID 2.2.2.2, Network Type POINT_TO_POINT, Cost: 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:01
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 3.3.3.3
Suppress hello for 0 neighbor(s)
Loopback0 is up, line protocol is up
Internet Address 2.2.2.2/24, Area 8
Process ID 100, Router ID 2.2.2.2, Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
第五种Point-to-Multipoint
在R2和R3上修改网络类型为Point-to-Multipoint
R2(config)#interface s1/2
R2(config-if)#ip ospf network point-to-multipoint
R2(config-if)#
R2(config-if)#
01:08:23: %OSPF-5-ADJCHG: Process 100, Nbr 3.3.3.3 on Serial1/2 from LOADING to FULL, Loading Done
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说明不需手动指定邻居。
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R3(config-if)#ip ospf network point-to-multipoint
R3(config-if)#
R3(config-if)#
01:05:52: %OSPF-5-ADJCHG: Process 100, Nbr 2.2.2.2 on Serial1/3 from LOADING to FULL, Loading Done、
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没有DR 和BDR的选举
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R2#show ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
3.3.3.3 1 FULL/ - 00:01:35 21.1.1.2 Serial1/2
R2#show ip ospf in
R2#show ip ospf interface
Serial1/2 is up, line protocol is up
Internet Address 21.1.1.1/24, Area 8
Process ID 100, Router ID 2.2.2.2, Network Type POINT_TO_MULTIPOINT, Cost: 64
Transmit Delay is 1 sec, State POINT_TO_MULTIPOINT,
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
Hello due in 00:00:25
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 3.3.3.3
Suppress hello for 0 neighbor(s)
Loopback0 is up, line protocol is up
Internet Address 2.2.2.2/24, Area 8
Process ID 100, Router ID 2.2.2.2, Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
