Monitoring BFD

show license bfd

• Use to display the bfd license key configured on the router.
• Example

  host1#show license bfd
  BFD license is bfd_license
  

• See show license.

show bfd session

• Use to display BFD protocol session information.
• Use the address keyword to specify an IPv4 or IPv6 session that you want to view.
• Use the detail keyword to view more detailed information about the BFD session.
• Field descriptions
  • Address—IP address of the remote interface with which the session is established. In unnumbered cases, the remote interface provides its reference IP address.
  • State—State of the BFD session, Up, Down, or AdminDown
  • Interface—Interface on which the BFD session has been established
  • Detect/Detection Time—Time (in seconds) taken to declare the remote interface down when no packets are received from that interface
  • Local discriminator—Value used to identify the session at the local end
  • Remote discriminator—Value used to identify the session at the remote end
  • Session up time—Amount of time the session has been operational since the last session down event in days:hours:minutes:seconds format.
  • Up/Down count—Number of times up/down transitions have occurred on the session
  • Adaptivity—Number of times this session has adapted its intervals, or that additional adaptivity is disabled for this BFD session on the router
  • Local
    • min tx interval—Minimum transmit interval (in seconds) configured on the session at the local end
    • min rx interval—Minimum receive interval (in seconds) configured on the session at the local end
    • multiplier—Multiplier configured on the session at the local end
  • (Adapted)
    • min tx interval—Minimum transmit interval (in seconds) to which the session is adapted at the local end
    • min rx interval—Minimum receive interval (in seconds) to which the session is adapted at the local end
    • multiplier—Multiplier to which the session is adapted at the local end
  • Remote
    • min tx interval—Minimum transmit interval (in seconds) configured on the session at the remote end
    • min rx interval—Minimum receive interval (in seconds) configured on the session at the remote end
    • multiplier—Multiplier configured on the session at the remote end
  • Up/Down count—Number of up/down transitions that have occurred on the session
  • Local diagnostic—Reason at the local end for the last session down event
  • Remote diagnostic—Reason at the remote end for the last session down event
  • Remote heard/Remote not heard—Whether the local end is receiving packets from the remote end
  • hears us/doesn't hear us—Whether the remote end is receiving packets from the local end
  • Min async interval—Minimum interval (in seconds) between packets sent when in asynchronous mode
  • min slow interval—Minimum interval (in seconds) between packets when the remote end is first being detected
  • Echo mode—State of echo mode (enabled or disabled; active or inactive)
  • Client—Name of the client
    • desired tx—Minimum transmit interval (in seconds) requested by the client
    • required rx—Minimum required receive interval (in seconds) specified by the client
    • multiplier—Multiplier requested by the client
    • TX FC-assisted?—Whether component in forwarding controller is acting to speed transmission times, yes or no; forwarding controller assist available only for ES2 4G LM
    • Detection FC-assisted?—Whether component in forwarding controller is acting to speed fast failure detection times, yes or no; forwarding controller assist available only for ES2 4G LM
• Example 1

  host1#show bfd session
  Address            State     Interface        Detect    Interval   Mx
                                                 Time 
  -------------------------------------------------------------------------
  172.16.1.2          Up        FastEthernet1/4   0.900     0.300     3
  172.16.1.1          Up        FastEthernet1/5   0.900     0.300     3
  172.16.1.3      AdminDown     FastEthernet1/2   0.900     0.300     3
  

• Example 2—IPv4 version

  host1#show bfd session detail
  Address: 172.16.1.2 
    State UP on Interface FastEthernet1/4
    Detection Time0.900, version v0    
    Local discriminator 3, Remote discriminator 1
    Session up time 00:00:01:04, Up/Down count 1, Adapted 3 times
    Local: min tx interval 0.3, min rx interval 0.3, multiplier 1
    (Adapted) min tx interval 0.6, min rx interval 0, multiplier 3
    Remote: min tx interval 0.3, min rx interval 0.3, multiplier 3
    Local diagnostic: None, Remote diagnostic: None
    Remote heard, hears us
    Min async interval 0.3, min slow interval 0.3
    Echo mode disabled/inactive
  2 Clients:  
    Client OSPFv2, desired tx: 0.3, required rx: 0.3, multiplier 3
    Client ISIS, desired tx: 0.3, required rx: 0.3, multiplier 3
    TX FC-assisted? Yes, Detection FC-assisted? Yes

• Example 3—IPv6 version

  host1#show bfd session detail
  Address fe80:1234::abcd 
    State UP on Interface FastEthernet1/3
    Detection Time0.900, version v1    
    Local discriminator 3, Remote discriminator 1
    Session up time 00:00:01:04, Up/Down count 1, Adaptivity disabled
    Local: min tx interval 0.3, min rx interval 0.3, multiplier 3
    (Adapted) min tx interval 0, min rx interval 0, multiplier 4
    Remote: min tx interval 0.3, min rx interval 0.3, multiplier 3
    Local diagnostic: None, Remote diagnostic: None
    Remote heard, hears us
    Min async interval 0.3, min slow interval 0.3
    Echo mode disabled/inactive
  1 Client:
    Client OSPFv3, desired tx: 0.3, required rx: 0.3, multiplier 3

• See show bfd session.