配置R1
[R1]ospf router-id 2.2.2.2
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]network 2.2.2.0 0.0.0.255
[R1-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255
[R1-ospf-1-area-0.0.0.0]network 13.1.1.0 0.0.0.255
[R1-ospf-1-area-0.0.0.0]quit
[R1]bfd
[R1-ospf-1]bfd all-interfaces ?
  detect-multiplier  Specify the detect multiplier
  enable             Enable BFD
  frr-binding        Configure BFD binding link status for Auto FRR
  min-rx-interval    Specify the minimum receive interval
  min-tx-interval    Specify the minimum transmit interval
[R1-ospf-1]bfd all-interfaces enable ?
  <cr>  Please press ENTER to execute command 
[R1-ospf-1]bfd all-interfaces enable 
Warning: The configuration succeeded. You need to enable global BFD to validate 
the configuration.
[R1-ospf-1]quit
查看R1配置BFD结果
[R1]display bfd session all 
--------------------------------------------------------------------------------
Local Remote     PeerIpAddr      State     Type        InterfaceName            
--------------------------------------------------------------------------------

8192  8193       12.1.1.2        Up        D_IP_IF     GigabitEthernet0/0/1     

--------------------------------------------------------------------------------
     Total UP/DOWN Session Number : 1/0
[R1]
配置R2
[R2]ospf router-id 3.3.3.3
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 3.3.3.0 0.0.0.255
[R2-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255
[R2-ospf-1-area-0.0.0.0]network 13.1.1.0 0.0.0.255
[R2-ospf-1-area-0.0.0.0]quit
[R2]bfd
[R2-ospf-1]bfd all-interfaces ?
  detect-multiplier  Specify the detect multiplier
  enable             Enable BFD
  frr-binding        Configure BFD binding link status for Auto FRR
  min-rx-interval    Specify the minimum receive interval
  min-tx-interval    Specify the minimum transmit interval
[R2-ospf-1]bfd all-interfaces enable ?
  <cr>  Please press ENTER to execute command 
[R2-ospf-1]bfd all-interfaces enable 
Warning: The configuration succeeded. You need to enable global BFD to validate 
the configuration.
[R2-ospf-1]quit
查看R2 配置的BFD结果
[R2]display bfd session all
--------------------------------------------------------------------------------
Local Remote     PeerIpAddr      State     Type        InterfaceName            
--------------------------------------------------------------------------------

8193  8192       12.1.1.1        Up        D_IP_IF     GigabitEthernet0/0/1     

--------------------------------------------------------------------------------
     Total UP/DOWN Session Number : 1/0