Monitoring BFD

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JUNOSe 9.1.x IP Services Configuration Guide > Configuring BFD > Monitoring BFD
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:
 To Display
 Command

 BFD session information

 show bfd session


 BFD license key information

 show license bfd



 
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 JUNOSe System Basics Configuration Guide, Chapter 2, Command-Line Interface, 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
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
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 Time    0.900, 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
Example 3—IPv6 version
host1#show bfd session detail
Address fe80:1234::abcd 
  State UP on Interface FastEthernet1/3
  Detection Time    0.900, 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

To Display	Command
BFD session information	show bfd session
BFD license key information	show license bfd

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