Monitoring BFD

This section lists the system event logs associated with the BFD protocol and describes the show commands you can use to view BFD-related information.

System Event Logs

To troubleshoot and monitor BFD, use the following system event logs:

• bfdGeneral
• bfdSession
• bfdEvents
• bgpConnections
• isisBfdEvents
• ospfEvents
• ospfv3General
• ripBfdLog

For more information about using event logs, see the JUNOSe System Event Logging Reference Guide.

Viewing BFD Information

You can monitor the following aspects of BFD by using the following show commands:

You can use the output filtering feature of the show command to include or exclude lines of output based on a text string that you specify. See Command Line Interface in JUNOSe System Basics Configuration Guide, for details.

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 or Down
  • 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

• 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.

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