- 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.
