1.    实验目的

1. 熟悉单臂回声的应用场景
2. 掌握单臂回声的配置方法

2.    实验拓扑

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3.    实验步骤

1）配置IP地址

AR1的配置

<Huawei>system-view

Enter system view, return user view with Ctrl+Z.

[Huawei]undo info-center enable

Info: Information center is disabled.

[Huawei]sysname AR1

[AR1]interface g0/0/0

[AR1-GigabitEthernet0/0/0]ip address 12.1.1.1 24

[AR1-GigabitEthernet0/0/0]quit

[AR1]interface g0/0/1

[AR1-GigabitEthernet0/0/1]ip address 13.1.1.1 24

[AR1-GigabitEthernet0/0/1]quit

[AR1]interface LoopBack 0

[AR1-LoopBack0]ip address 1.1.1.1 32

[AR1-LoopBack0]quit

AR2的配置

<Huawei>system-view

Enter system view, return user view with Ctrl+Z.

[Huawei]undo info-center enable

Info: Information center is disabled.

[Huawei]sysname AR2

[AR2]interface g0/0/1

[AR2-GigabitEthernet0/0/1]ip address 12.1.1.2 24

[AR2-GigabitEthernet0/0/1]quit

[AR2]interface LoopBack 0

[AR2-LoopBack0]ip address 8.8.8.8 32

[AR2-LoopBack0]quit

AR3的配置

<Huawei>system-view

Enter system view, return user view with Ctrl+Z.

[Huawei]undo info-center enable

Info: Information center is disabled.

[Huawei]sysname AR3

[AR3]interface g0/0/2

[AR3-GigabitEthernet0/0/2]ip address 13.1.1.3 24

[AR3-GigabitEthernet0/0/2]quit

[AR3]interface LoopBack 0

[AR3-LoopBack0]ip address 8.8.8.8 32

[AR3-LoopBack0]quit

2）单臂回声配置

[AR1]bfd

[AR1-bfd]quit

[AR1]bfd joinlabs bind peer-ip 12.1.1.2 interface g0/0/0 one-arm-echo

[AR1-bfd-session-joinlabs]discriminator local 100

[AR1-bfd-session-joinlabs]min-echo-rx-interval 300

[AR1-bfd-session-joinlabs]commit

[AR1-bfd-session-joinlabs]quit

3）配置默认路由

AR1的配置

[AR1]ip route-static 0.0.0.0 0 12.1.1.2 track bfd-session joinlabs

[AR1]ip route-static 0.0.0.0 0 13.1.1.3 preference 100

AR2的配置

[AR2]ip route-static 1.1.1.1 32 12.1.1.1

AR3的配置

[AR3]ip route-static 1.1.1.1 32 13.1.1.1

4）实验调试

在AR1上Tracert 8.8.8.8

<AR1>tracert -a 1.1.1.1 8.8.8.8

 traceroute to  8.8.8.8(8.8.8.8), max hops: 30 ,packet length: 40,press CTRL_C to break

 1 12.1.1.2 40 ms  40 ms  50 ms

通过以上输出可以看到1.1.1.1去访问8.8.8.8走的AR2

在AR1上查看bfd的详细信息

<AR1>display bfd session all verbose

----------------------------------------------------------------------------

Session MIndex : 512       (One Hop) State : Up        Name : joinlabs      

----------------------------------------------------------------------------

  Local Discriminator    : 100              Remote Discriminator   : -        

  Session Detect Mode    : Asynchronous One-arm-echo Mode                     

  BFD Bind Type          : Interface(GigabitEthernet0/0/0)                    

  Bind Session Type      : Static                                              

  Bind Peer IP Address   : 12.1.1.2                                           

  NextHop Ip Address     : 12.1.1.2                                           

  Bind Interface         : GigabitEthernet0/0/0                               

  FSM Board Id           : 0                TOS-EXP                : 7        

  Echo Rx Interval (ms)  : 300                                                

  Actual Tx Interval (ms): 300              Actual Rx Interval (ms): 300      

  Local Detect Multi     : 3                Detect Interval (ms)   : 900       

  Echo Passive           : Disable          Acl Number             : -        

  Destination Port       : 3784             TTL                    : 255      

  Proc Interface Status  : Disable          Process PST            : Disable  

  WTR Interval (ms)      : -                                                  

  Active Multi           : 3                                                  

  Last Local Diagnostic  : Control Detection Time Expired                     

  Bind Application       : No Application Bind

  Session TX TmrID       : -                Session Detect TmrID   : -        

  Session Init TmrID     : -                Session WTR TmrID      : -        

  Session Echo Tx TmrID  : -                                                  

  PDT Index              : FSM-0 | RCV-0 | IF-0 | TOKEN-0                      

  Session Description    : -                                                  

----------------------------------------------------------------------------

     Total UP/DOWN Session Number : 1/0

把AR2上的g0/0/1阻塞掉，再次在AR1上Tracert 8.8.8.8

[AR2]interface g0/0/1

[AR2-GigabitEthernet0/0/1]shutdown

[AR2-GigabitEthernet0/0/1]quit

<AR1>tracert -a 1.1.1.1 8.8.8.8

 traceroute to  8.8.8.8(8.8.8.8), max hops: 30 ,packet length: 40,press CTRL_C to break

 1 13.1.1.3 50 ms  40 ms  50 ms

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