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配置OSPF for BFD特性示例

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问题描述：

/ 组网需求 /

RouterA、RouterB 和 RouterC 之间运行 OSPF。
使能 RouterA、RouterB 和 RouterC 的 OSPF 进程 BFD 特性。
业务流量在主链路 RouterA→RouterB 上传送，链路 RouterA→RouterC→RouterB 作为备份链路。
在 RouterA 和 RouterB 之间的链路上创建接口的 BFD 特性，当 RouterA 和 RouterB 之间的链路出现故障时,BFD能够快速检测到故障并通告给OSPF 协议,使业务流量使用备份链路传送。

/ 实验拓扑 /

/ 配置思路/

采用如下思路配置 BFD for OSPF 特性:

在各路由器上使能 OSPF 基本功能
使能全局 BFD 特性
在 RouterA 和 RouterB 上使能 OSPF BFD 检测机制。

/ 实验编址 /

设备	接口	IP地址	子网掩码
RA	G0/0/2	3.3.3.1	24
RA	G0/0/1	1.1.1.1	24
RB	G0/0/1	3.3.3.2	24
	G0/0/0	2.2.2.2	24
	G0/0/2	172.16.1.1	24
RC	G0/0/0	2.2.2.1	24
RC	G0/0/1	1.1.1.2	24

/ 实验配置 /

基本配置

[RouterA]int g0/0/1[RouterA-GigabitEthernet0/0/1]ip add 1.1.1.1 24[RouterA-GigabitEthernet0/0/1]int g0/0/2[RouterA-GigabitEthernet0/0/2]ip add 3.3.3.1 24

[RouterB]int g0/0/0[RouterB-GigabitEthernet0/0/0]ip add 2.2.2.2 24[RouterB-GigabitEthernet0/0/0]int g0/0/1[RouterB-GigabitEthernet0/0/1]ip add 3.3.3.2 24[RouterB-GigabitEthernet0/0/0]int g0/0/2[RouterB-GigabitEthernet0/0/2]ip add 172.16.1.1 24

[RouterC]int g0/0/0[RouterC-GigabitEthernet0/0/0]ip add 2.2.2.1 24[RouterC-GigabitEthernet0/0/0]int g0/0/1[RouterC-GigabitEthernet0/0/1]ip add 1.1.1.2 24

配置OSPF路由

# 配置 RouterA。

[RouterA]ospf router id 1.1.1.1[RouterA-ospf-1]area 0[RouterA-ospf-1-area-0.0.0.0] network 1.1.1.0 0.0.0.255[RouterA-ospf-1-area-0.0.0.0] network 3.3.3.0 0.0.0.255[RouterA-ospf-1-area-0.0.0.0]quit[RouterA-ospf-1] quit

# 配置 RouterB。

[RouterB]ospf router id 2.2.2.2[RouterB-ospf-1] area 0[RouterB-ospf-1-area-0.0.0.0] network 2.2.2.0 0.0.0.255[RouterB-ospf-1-area-0.0.0.0] network 3.3.3.0 0.0.0.255[RouterB-ospf-1-area-0.0.0.0]network 172.16.1.0 0.0.0.255[RouterB-ospf-1-area-0.0.0.0] quit[RouterB-ospf-1] quit

# 配置 RouterC。

[RouterC]ospf router id 3.3.3.3[RouterC-ospf-1] area 0[RouterC-ospf-1-area-0.0.0.0] network 1.1.1.0 0.0.0.255[RouterC-ospf-1-area-0.0.0.0] network 2.2.2.0 0.0.0.255[RouterC-ospf-1-area-0.0.0.0]quit[RouterC-ospf-1] quit # 配置完成后，执行 display ospf peer 命令，可以看到 RouterA，RouterB 和 RouterC 之间互相建立了邻居关系。以 RouterA 的显示结果为例。

<RouterA> display ospf peer

# 查看 RouterA 的 OSPF 路由表的信息，应该有去往 RouterB 和 RouterC 的路由表项，去往172.16.1.0/24 的路由下一跳地址为 3.3.3.2，流量在主链路 RouterA→RouterB 上传输。

<RouterA> display ospf routing

配置OSPF BFD

# 在 RouterA 上使能全局 BFD 特性

[RouterA] bfd[RouterA-bfd] quit[RouterA] ospf[RouterA-ospf-1] bfd all-interfaces enable[RouterA-ospf-1]quit

# 在 RouterB 上使能全局 BFD 特性。

[RouterB] bfd[RouterB-bfd] quit[RouterB] ospf[RouterB-ospf-1] bfd all-interfaces enable[RouterB-ospf-1] quit

# 在 RouterC 上使能全局 BFD 特性,

[RouterC] bfd[RouterC-bfd]quit[RouterC] ospf[RouterC-ospf-1] bfd all-interfaces enable[RouterC-ospf-1] quit # 配置完成后，在 RouterA 或 RouterB、RouterC 上执行 display ospfbfd session all 命令，可以看到 BFDState 的状态为 Up。

以 RouterA 的显示为例。

[RouterA] display ospf bfd session all

配置接口的BFD特性

# 在 RouterA 的 GigabitEthernet0/0/2 接口上配置 BFD 特性，并指定最小发送和接收间隔为500ms，本地检测时间倍数为4。

[RouterA]interface gigabitethernet 0/0/2[RouterA-GigabitEthernet0/0/2]ospf bfd enable[RouterA-GigabitEthernet0/0/2]ospf bfd min-tx-interval 500 min-rx-interval 500 detect-multiplier 4[RouterA-GigabitEthernet0/0/2]quit # 在 RouterB 的 GigabitEthernet0/0/1 接口上配置 BFD 特性，并指定最小发送和接收间隔为500ms，本地检测时间倍数为 4。

[RB]interface gigabitethernet 0/0/1[RB-GigabitEthernet0/0/1]ospf bfd enable[RB-GigabitEthernet0/0/1]ospf bfd min-tx-interval 500 min-rx-interval 500 detect-multiplier 4[RB-GigabitEthernet0/0/1] #配置元成后，在 RouterB 或 RouterC上执行 display ospf bfd session a 命令，可以看到BFDState 的状态为 UP。

以 RouterB 的显示为例。

[RouterB] display ospf bfd session all

检查配置结果

# 对 RouterB 的 GE0/0/1 接口执行 shutdown 命令，模拟主链路故障。

[RouterB]interface gigabitethernet 0/0/1[RouterB-GigabitEthernet0/0/1]shutdown # 在路由器 RouterA 上，查看路由表。可以看出，在主链路失效后，备份链路RouterA-RouterC-RouterB 生效，去往 172.16.1.0/24 的路由下一跳地址为 1.1.1.2。

<RouterA> display ospf routing

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