18.8 BFD基础

3.配置单臂回声

1)R1配置

[R1]bfd R1toR4 bind peer-ip 14.1.1.4 interface GigabitEthernet 0/0/1 one-arm-echo 
//创建三层链路单跳检测的BFD会话R1toR4，绑定对端IP地址和本端相应接口,用接口0/0/1来单向检测
[R1-bfd-session-r1tor4]discriminator local 40
//配置一个本地标识符
[R1-bfd-session-r1tor4]min-echo-rx-interval 100
//配置一个检测时间100毫秒
[R1-bfd-session-r1tor4]commit
[R1]ip route-static 4.4.4.4 32 14.1.1.4 track bfd-session R1toR4

2)验证配置,“(One Hop) State”状态为Up

[R1]display bfd session all verbose
Session MIndex : 257       (One Hop) State : Up        Name : r1tor4 
 Local Discriminator    : 40               Remote Discriminator   : -         
  Session Detect Mode    : Asynchronous One-arm-echo Mode                      
  BFD Bind Type          : Interface(GigabitEthernet0/0/1)                     
  Bind Session Type      : Static                                              
  Bind Peer IP Address   : 14.1.1.4                                            
  NextHop Ip Address     : 14.1.1.4                                            
  Bind Interface         : GigabitEthernet0/0/1                                
  FSM Board Id           : 0                TOS-EXP                : 7         
  Echo Rx Interval (ms)  : 100                                                 
  Actual Tx Interval (ms): 100              Actual Rx Interval (ms): 100       
  Local Detect Multi     : 3                Detect Interval (ms)   : 300       
  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  : No Diagnostic                                       
  Bind Application       : No Application Bind
  Session TX TmrID       : -                Session Detect TmrID   : -         
  Session Init TmrID     : -                Session WTR TmrID      : -         
  Session Echo Tx TmrID  : -                                                   
  PDT Index              : FSM-1 | RCV-0 | IF-0 | TOKEN-0                      
  Session Description    : -                                   

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