帧中继点到点子接口下配置OSPF

阿宝和佳佳

帧中继点到点子接口下配置OSPF

1、  实验目的

通过本实验可以掌握

1）  帧中继点到点子接口的特征；

2）  帧中继点到点子接口的配置；

3）  帧中继点到点子接口模式下OSPF的配置和调试

2、  实验拓扑图

3、  实验步骤

本实验在路由器R1上创建2个点到点子接口，分别与路由器R3和R4上创建的点到点子接口形成点到点连接，拓扑结构采用Hub-and-Spoke结构，整个网络运行OSPF路由协议。

1）  配置路由器R1：

R1#conf t

Enterconfiguration commands, one per line. End with CNTL/Z.

R1(config)#intloopback 0

R1(config-if)#ipaddress 192.168.1.1 255.255.255.0

R1(config-if)#noshutdown

R1(config-if)#ipospf network point-to-point

R1(config-if)#exit

R1(config)#ints1/0

R1(config-if)#noip address

R1(config-if)#encapsulationframe-relay

R1(config-if)#noframe-relay inverse-arp

R1(config-if)#noshutdown

R1(config-if)#exit

R1(config)#int s1/0.13 point-to-point    //创建帧中继点到点子接口

R1(config-subif)#ipaddress 192.168.13.1 255.255.255.0

R1(config-subif)#frame-relay interface-dlci 103  //配置帧中继映射

【提示】

点到点子接口下不能使用“frame-relay map ip”命令来配置帧中继的映射，而是改用“frame-relay interface-dlci”命令来配置

R1(config-fr-dlci)#exit

R1(config-subif)#exit

R1(config)#ints1/0.14 point-to-point

R1(config-subif)#ipaddress 192.168.14.1 255.255.255.0

R1(config-subif)#frame-relayinterface-dlci 104

R1(config-fr-dlci)#exit

R1(config-subif)#exit

R1(config)#routerospf 1

R1(config-router)#router-id1.1.1.1

R1(config-router)#network192.168.1.0 0.0.0.255 area 0

R1(config-router)#network192.168.13.0 0.0.0.255 area 0

R1(config-router)#network192.168.14.0 0.0.0.255 area 0

2）  配置路由器R3

R3#conf t

Enterconfiguration commands, one per line. End with CNTL/Z.

R3(config)#intloopback 0

R3(config-if)#ipaddress 192.168.3.1 255.255.255.0

R3(config-if)#noshow

R3(config-if)#ipos

R3(config-if)#ipospf net

R3(config-if)#ipospf network p

R3(config-if)#ipospf network point-to-p

R3(config-if)#ipospf network point-to-point

R3(config-if)#exit

R3(config)#ints1/1

R3(config-if)#noip address

R3(config-if)#encapsulationframe-relay

R3(config-if)#noframe-relay inverse-arp

R3(config-if)#noshutdown

R3(config-if)#exit

R3(config)#ints1/1.13 point-to-point

R3(config-subif)#ipaddress 192.168.13.3 255.255.255.0

R3(config-subif)#frame-relayinterface-dlci 301

R3(config-fr-dlci)#exit

R3(config-subif)#exit

R3(config)#routerospf 1

R3(config-router)#router-id3.3.3.3

R3(config-router)#network192.168.13.0 0.0.0.255 area 0

R3(config-router)#network192.168.3.0 0.0.0.255 area 0  

3）  配置路由器R4

R4#conf t

Enterconfiguration commands, one per line. End with CNTL/Z.

R4(config)#intloopback 0

R4(config-if)#ipaddress 192.168.4.1 255.255.255.0

R4(config-if)#ipospf network point-to-point

R4(config-if)#noshutdown

R4(config-if)#exit

R4(config)#ints1/2

R4(config-if)#noip address

R4(config-if)#encapsulationframe-relay

R4(config-if)#noframe-relay inverse-arp

R4(config-if)#noshutdown

R4(config-if)#exit

R4(config)#ints1/2.14 point-to-point

R4(config-subif)#ipaddress 192.168.14.4 255.255.255.0

R4(config-subif)#frame-relayinterface-dlci 401

R4(config-fr-dlci)#exit

R4(config-subif)#exit

R4(config)#routerospf 1

R4(config-router)#router-id4.4.4.4

R4(config-router)#network192.168.4.0 0.0.0.255 area 0

R4(config-router)#network192.168.14.0 0.0.0.255 area 0

4）  配置帧中继

R2#conf t

Enterconfiguration commands, one per line. End with CNTL/Z.

R2(config)#frame-relayswitching

R2(config)#ints1/0

R2(config-if)#clockrate 64000

R2(config-if)#encapsulationframe-relay

R2(config-if)#frame-relaylmi-type cisco

R2(config-if)#frame-relayintf-type dce

R2(config-if)#frame-relayroute 103 interface s1/1 301

R2(config-if)#frame-relayroute 104 interface s1/2 401

R2(config-if)#noshutdown

R2(config-if)#exit

R2(config)#ints1/1

R2(config-if)#clockrate 64000

R2(config-if)#encapsulationframe-relay

R2(config-if)#frame-relaylmi-type cisco

R2(config-if)#frame-relayintf-type dce

R2(config-if)#frame-relayroute 301 interface s1/0 103

R2(config-if)#noshutdown

R2(config-if)#exit

R2(config)#ints1/2

R2(config-if)#clockrate 64000

R2(config-if)#encapsulationframe-relay

R2(config-if)#frame-relaylmi-type cisco

R2(config-if)#frame-relayintf-type dce

R2(config-if)#frame-relayroute 401 interface s1/0 104

R2(config-if)#noshutdown

4、  实验调试

1）  show frame-relay map

R1#showframe-relay map

Serial1/0.13(up): point-to-point dlci, dlci 103(0x67,0x1870), broadcast

          status defined, active

Serial1/0.14(up): point-to-point dlci, dlci 104(0x68,0x1880), broadcast

          status defined, active

R1#

R3#showframe-relay ma

R3#showframe-relay map

Serial1/1.13(up): point-to-point dlci, dlci 301(0x12D,0x48D0), broadcast

          status defined, active

R3#

R4#shframe-relay map

Serial1/2.14(up): point-to-point dlci, dlci 401(0x191,0x6410), broadcast

          status defined, active

R4#

以上输出表明路由器使用了点到点子接口，由于点到点的特性，在每条映射条目中，只看到该子接口下的DLCI，没有对端的IP地址，这一点和多点子接口是不同的。

2）  show ip ospf interface

R1#showip ospf interface

Serial1/0.14is up, line protocol is up

  Internet Address 192.168.14.1/24, Area 0

  Process ID 1, Router ID 1.1.1.1, Network TypePOINT_TO_POINT, Cost: 64

//OSPF网络类型为点到点，在帧中继点到点子接口网络上，OSPF接口默认的网络类型为POINT_TO_POINT。

  Transmit Delay is 1 sec, StatePOINT_TO_POINT,

  Timer intervals configured, Hello 10, Dead40, Wait 40, Retransmit 5

// POINT_TO_POINT模式下，Hello周期为10s

    oob-resync timeout 40

Hello duein 00:00:06

……（此处省略部分输出）

3）  show ip route

R1#showip route ospf

O    192.168.4.0/24 [110/65] via 192.168.14.4,00:18:11, Serial1/0.14

O    192.168.3.0/24 [110/65] via 192.168.13.3,00:18:11, Serial1/0.13

R1#

R3#sh iproute ospf

O    192.168.14.0/24 [110/128] via 192.168.13.1,00:18:50, Serial1/1.13

O    192.168.4.0/24 [110/129] via 192.168.13.1,00:18:50, Serial1/1.13

O    192.168.1.0/24 [110/65] via 192.168.13.1,00:18:50, Serial1/1.13

R3#

R4#sh iproute ospf

O    192.168.13.0/24 [110/128] via 192.168.14.1,00:19:41, Serial1/2.14

O    192.168.1.0/24 [110/65] via 192.168.14.1,00:19:41, Serial1/2.14

O    192.168.3.0/24 [110/129] via 192.168.14.1,00:19:41, Serial1/2.14

R4#

以上个路由器的路由表的输出表明了整个网络的互通的。

4）show ip ospfneighbor detail

R3#showip ospf neighbor detail

Neighbor 1.1.1.1, interface address192.168.13.1

    In the area 0 via interface Serial1/1.13

    Neighbor priority is 0, State is FULL, 6state changes

    DR is 0.0.0.0 BDR is 0.0.0.0

//点到点模式的DR和BDR是“0.0.0.0”

    Options is 0x52

    LLS Options is 0x1 (LR)

    Dead timer due in 00:00:37

    Neighbor is up for 00:37:02

    Index 1/1, retransmission queue length 0,number of retransmission 0

    First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)

    Last retransmission scan length is 0,maximum is 0

    Last retransmission scan time is 0 msec,maximum is 0 msec

R3#

以上输出表明路由器R3通过自接口S1/1.13与路由器R1建立邻接关系。

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