一、场景设置
R4、R3、R2通过R1相连，形成hub and spoke网络拓扑，R1为模拟帧中继交换机，R4为hub路由器，R2、R3 为spoke路由器，R4、R3、R2采用点对多点接口。所有路由器均使用物理接口连接并启用OSPF。
二、具体配置
1、使用R1模拟帧中继交换机:
Router(config)#hostname FRS
FRS(config)#frame-relay switching
FRS(config)#interface Serial1/0
FRS(config-if)#no ip address
FRS(config-if)#encapsulation frame-relay
FRS(config-if)#clock rate 2016000
FRS(config-if)#frame-relay intf-type dce
FRS(config-if)#frame-relay route 201 interface Serial1/3 102
FRS(config-if)#no shutdown
FRS(config-if)#exit
FRS(config)#interface Serial1/2
FRS(config-if)#no ip address
FRS(config-if)#encapsulation frame-relay
FRS(config-if)#no ip route-cache
FRS(config-if)#clock rate 2016000
FRS(config-if)#frame-relay intf-type dce
FRS(config-if)#frame-relay route 301 interface Serial1/3 103
FRS(config-if)#no shutdown
FRS(config-if)#exit
FRS(config)#interface Serial1/3
FRS(config-if)#no ip address
FRS(config-if)#encapsulation frame-relay
FRS(config-if)#no ip route-cache
FRS(config-if)#clock rate 2016000
FRS(config-if)#frame-relay intf-type dce
FRS(config-if)#frame-relay route 102 interface Serial1/0 201
FRS(config-if)#frame-relay route 103 interface Serial1/2 301
FRS(config-if)#no shutdown
FRS(config-if)#exit
HQ(config)#interface Loopback1
HQ(config-if)#ip address 10.1.1.1 255.255.255.0
HQ(config-if)#ip ospf network point-to-point
HQ(config-if)#exit
HQ(config)#interface Serial1/3
HQ(config-if)#ip address 10.1.123.1 255.255.255.0
HQ(config-if)#encapsulation frame-relay
HQ(config-if)#ip ospf network point-to-multipoint #the default network type is non-broadcast
HQ(config-if)#frame-relay map ip 10.1.123.1 102 #使得HQ可以Ping通自己
HQ(config-if)#frame-relay map ip 10.1.123.2 102 broadcast #帧中继静态映射
HQ(config-if)#frame-relay map ip 10.1.123.3 103 broadcast
HQ(config-if)#no frame-relay inverse-arp #关闭动态ARP映射
HQ(config-if)#no shutdown
HQ(config-if)#exit
HQ(config)#router ospf 1
HQ(config-router)#log-adjacency-changes
HQ(config-router)#network 10.1.1.0 0.0.0.255 area 0
HQ(config-router)#network 10.1.123.0 0.0.0.255 area 0
HQ(config-router)#exit
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3、R2的配置如下：
Router(config)#hostname EAST
EAST(config)#interface Loopback2
EAST(config-if)#ip address 10.1.2.1 255.255.255.0
EAST(config-if)#ip ospf network point-to-point
EAST(config-if)#exit
EAST(config)#interface Serial1/0
EAST(config-if)#ip address 10.1.123.2 255.255.255.0
EAST(config-if)#encapsulation frame-relay
EAST(config-if)#ip ospf network point-to-multipoint
EAST(config-if)#frame-relay map ip 10.1.123.2 201
EAST(config-if)#frame-relay map ip 10.1.123.1 201 broadcast
EAST(config-if)#frame-relay map ip 10.1.123.3 201 broadcast
EAST(config-if)#no frame-relay inverse-arp
EAST(config-if)#no shutdown
EAST(config-if)#exit
EAST(config)#interface Serial1/1
EAST(config-if)#ip address 10.1.23.2 255.255.255.0
EAST(config-if)#ip ospf hello-interval 5 #更改定时器timer
EAST(config-if)#ip ospf dead-interval 15
EAST(config-if)#no shutdown
EAST(config-if)#exit
EAST(config)#router ospf 1
EAST(config-router)#network 10.1.2.0 0.0.0.255 area 0
EAST(config-router)#network 10.1.23.0 0.0.0.255 area 0
EAST(config-router)#network 10.1.123.0 0.0.0.255 area 0
EAST(config-router)#exit
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4、R3的配置如下：
Router(config)#hostname WEST
WEST(config)#interface Loopback3
WEST(config-if)#ip address 10.1.3.1 255.255.255.0
WEST(config-if)#ip ospf network point-to-point
WEST(config-if)#exit
WEST(config)#interface Serial1/1
WEST(config-if)#ip address 10.1.23.3 255.255.255.0
WEST(config-if)#ip ospf hello-interval 5
WEST(config-if)#ip ospf dead-interval 15
WEST(config-if)#no shutdown
WEST(config-if)#exit
WEST(config)#interface Serial1/2
WEST(config-if)#ip address 10.1.123.3 255.255.255.0
WEST(config-if)#encapsulation frame-relay
WEST(config-if)#ip ospf network point-to-multipoint
WEST(config-if)#frame-relay map ip 10.1.123.3 301
WEST(config-if)#frame-relay map ip 10.1.123.1 301 broadcast
WEST(config-if)#frame-relay map ip 10.1.123.2 301 broadcast
WEST(config-if)#no frame-relay inverse-arp
WEST(config-if)#no shutdown
WEST(config-if)#exit
WEST(config)#router ospf 1
WEST(config-router)#network 10.1.3.0 255.255.255.0 area 0
WEST(config-router)#network 10.1.23.0 255.255.255.0 area 0
WEST(config-router)#network 10.1.123.0 255.255.255.0 area 0
WEST(config-router)#exit
三、验证配置：
EAST:
EAST#show ip ospf interface Serial1/0
Serial1/0 is up, line protocol is up
Internet Address 10.1.123.2/24, Area 0
Process ID 1, Router ID 10.1.2.1, 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
oob-resync timeout 120
Hello due in 00:00:10
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 3/3, 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 4 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.1.1.1
Suppress hello for 0 neighbor(s)
EAST#show ip ospf neighbor
#无DR、BDR的选举！Neighbor ID Pri State Dead Time Address Interface
10.1.1.1 0 FULL/ - 00:01:54 10.1.123.1 Serial1/0
10.1.3.1 0 FULL/ - 00:00:10 10.1.23.3 Serial1/1
EAST#show ip route ospf
10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
O 10.1.3.0/24 [110/65] via 10.1.23.3, 00:02:30, Serial1/1
O 10.1.1.0/24 [110/65] via 10.1.123.1, 00:02:30, Serial1/0
O 10.1.123.1/32 [110/64] via 10.1.123.1, 00:02:30, Serial1/0
O 10.1.123.3/32 [110/64] via 10.1.23.3, 00:02:30, Serial1/1
WEST:
WEST#show ip ospf interface Serial1/2
Serial1/2 is up, line protocol is up
Internet Address 10.1.123.3/24, Area 0
Process ID 1, Router ID 10.1.3.1, 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
oob-resync timeout 120
Hello due in 00:00:07
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 3/3, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 4 msec, maximum is 4 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.1.1.1
Suppress hello for 0 neighbor(s)
WEST#show ip ospf neighbor #无DR、BDR的选举！
Neighbor ID Pri State Dead Time Address Interface
10.1.1.1 0 FULL/ - 00:01:46 10.1.123.1 Serial1/2
10.1.2.1 0 FULL/ - 00:00:11 10.1.23.2 Serial1/1
WEST#show ip route ospf
10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
O 10.1.2.0/24 [110/65] via 10.1.23.2, 00:07:16, Serial1/1
O 10.1.1.0/24 [110/65] via 10.1.123.1, 00:07:16, Serial1/2
O 10.1.123.1/32 [110/64] via 10.1.123.1, 00:07:16, Serial1/2
O 10.1.123.2/32 [110/64] via 10.1.23.2, 00:07:16, Serial1/1
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