实验3 配置帧中继下的OSPF网络类型

1、配置OSPF网络类型一、 拓扑图，如图1.1所示：图1.1 帧中继下OSPF实验拓扑图二、 初始配置：1. R1的初始配置：R1(config)#int s3/0R1(config-if)#no shR1(config-if)#encapsulation frame-relayR1(config-if)#no frame-relay inverse-arpR1(config-if)#no arp frame-relayR1(config-if)#frame-relay map ip 123.0.0.2 102 broadcast2. R2的初始配置：R2(config)#int s3/0R2(

2、config-if)#ip add 123.0.0.2 R2(config-if)#no shR2(config-if)#encapsulation frame-relayR2(config-if)#no frame-relay inverse-arpR2(config-if)#no arp frame-relayR2(config-if)#frame-relay map ip 123.0.0.1 201 broadcastR2(config-if)#frame-relay map ip 123.0.0.3 203 broadcast3. R3的初始配置：R3(config)#int s3/0

3、R3(config-if)#no shR3(config-if)#encapsulation frame-relay R3(config-if)#no arp frame-relay R3(config-if)#no frame-relay inverse-arpR3(config-if)#frame-relay map ip 123.0.0.2 302 broadcast三、 在R2上查看OSPF相关信息/查看OSPF邻居信息R2#sh ip os neR2#/查看OSPF接口信息R2#sh ip os int s3/0Serial3/0 is up, line protocol is up

4、 Internet Address 123.0.0.2/24, Area 0 /S3/0所连网络类型为NON_BROADCAST Process ID 1, Router ID 2.2.2.2, Network Type NON_BROADCAST, Cost: 64 Transmit Delay is 1 sec, State DR, Priority 10 No backup designated router on this network Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5 oob

5、-resync timeout 120 Hello due in 00:00:04 Index 2/2, 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 0, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s)以上结果说明，在NON_BROADCAST网络中，不会发送广播，也

6、不会发送组播，所以OSPF不会在帧中继接口上发送Hello包，无法建立邻居关系，因此也就无法建立邻接关系，手工指定neighbour，使其单播发送Hello包。四、 实验过程1. 在NON_BROADCAST网络中，各路由器上手工指定相应邻居/在R1上指定其邻居R2/在R2上指定其邻居R2、R3/在R3上指定其邻居R2/在R2上show ip ospf neighborR2#sh ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface1.1.1.1 1 FULL/DROTHER 00:01:49 123.0.0.1

7、Serial3/03.3.3.3 1 FULL/BDR 00:01:47 123.0.0.3 Serial3/0以上实验说明，在NON_BROADCAST网络中可以通过手工指定邻居，在该种网路中需要选举DR/BDR，因控制中心路由器称为DR，保证数据库的正确同步。2. 删除邻居，清OSPF进程，将OSPF网络类型修改为BROADCAST，在OSPF接口上，配置ip ospf network broadcast/在OSPF接口上修改OSPF网络类型为BROADCAST/R1上做相应配置R1(config-router)#no R1(config-router)#do clear ip os pR

8、eset ALL OSPF processes? no: yR1(config-if)#ip ospf network broadcast/R2上做相应配置R2(config-router)#no neighbor 123.0.0.1R2(config-router)#no neighbor 123.0.0.3R2(config-router)#do clear ip os pReset ALL OSPF processes? no: yR2(config-if)#ip ospf network broadcast/R3上做相应配置R3(config-router)#no neighbor 1

9、23.0.0.2R3(config-router)#do clear ip os pReset ALL OSPF processes? no: yR3(config-if)#ip ospf network broadcast/在R2上查看邻居信息R2(config-if)#do sh ip os neNeighbor ID Pri State Dead Time Address Interface1.1.1.1 1 FULL/DROTHER 00:00:35 123.0.0.1 Serial3/03.3.3.3 1 FULL/DR 00:00:34 123.0.0.3 Serial3/0以上结

10、果说明，OSPF认为此类网络支持广播和组播，所以不需要手工指定邻居，但也需要控制DR/BDR的选举，否则也可导致数据库不同步从而发生错误路由。/在R1上查看路由表R1(config-router)#do sh ip rouCodes: C - connected, S - static, 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

11、E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, 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 routeGateway of last resort is not set 1.0.0.0/24 is subnetted, 1

12、 subnetsC 1.1.1.0 is directly connected, Loopback0 2.0.0.0/32 is subnetted, 1 subnetsO 2.2.2.2 110/65 via 123.0.0.2, 00:01:22, Serial3/0 123.0.0.0/24 is subnetted, 1 subnetsC 123.0.0.0 is directly connected, Serial3/0/在R1上查看OSPF接口信息R1(config-router)#do sh ip os int s3/0Serial3/0 is up, line protocol

13、 is up Internet Address 123.0.0.1/24, Area 0 Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 64 Transmit Delay is 1 sec, State DR, Priority 1 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 oob-resync timeout 40 Hello due in 00:00:06 Index 2/2, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is