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show bfd session

Syntax

show bfd session
<brief | detail | extensive | summary>
<address address>
<discriminator discriminator>
<logical-system (all | logical-system-name)>
<prefix address>

Release Information

Command introduced before JUNOS Release 7.4.

The discriminator and address options were introduced in JUNOS Release 8.2.

The prefix option was introduced in JUNOS Release 9.0.

Description

Display information about active Bidirectional Forwarding Detection (BFD) sessions.

Options

none — (Same as brief) Display information about active BFD sessions.

address address — (Optional) Display information about the BFD session for the specified neighbor address.

brief | detail | extensive | summary — (Optional) Display the specified level of output.

discriminator discriminator — (Optional) Display information about the BFD session using the specified local discriminator.

logical-system (all | logical-system-name) — (Optional) Perform this operation on all logical systems or on a particular logical system.

prefix address — Display information about all of the BFD sessions for the specified Label Distribution Protocol (LDP) forwarding equivalence class (FEC).

Required Privilege Level

view

Related Topics

clear bfd session

List of Sample Output

show bfd session
show bfd session brief
show bfd session detail
show bfd session address
show bfd session extensive
show bfd session summary

Output Fields

Table 12 describes the output fields for the show bfd session command. Output fields are listed in the approximate order in which they appear.

Table 12: show bfd session Output Fields

Field Name

Field Description

Level of Output

Address

Address on which the BFD session is active.

brief detail extensive none

State

State of the BFD session: Up, Down, Init (initializing), or Failing.

brief detail extensive none

Interface

Interface on which the BFD session is active.

brief detail extensive none

Detect Time

Negotiated time interval, in seconds, used to detect BFD control packets.

brief detail extensive none

Transmit Interval

Time interval, in seconds, used by the transmitting system to send BFD control packets.

brief detail extensive none

Multiplier

Negotiated multiplier by which the time interval is multiplied to determine the detection time for the transmitting system.

detail extensive

Session up time

How long a BFD session has been established.

detail extensive

Client

Protocol for which the BFD session is active: ISIS, OSPF, or Static.

detail extensive

TX Interval

Time interval, in seconds, used by the host system to transmit BFD control packets.

brief detail extensive none

RX Interval

Time interval, in seconds, used by the host system to receive BFD control packets.

brief detail extensive none

Local diagnostic

Local diagnostic information about failing BFD sessions.

detail extensive

Remote diagnostic

Remote diagnostic information about failing BFD sessions.

detail extensive

Remote state

Reports whether the remote system's BFD packets are received and whether the remote system is receiving transmitted control packets.

detail extensive

Version

BFD version: 0 or 1.

extensive

Replicated

The replicated flag appears when nonstop routing is configured and the BFD session has been replicated to the backup Routing Engine.

detail extensive

Min async interval

Minimum amount of time, in seconds, between asynchronous control packet transmissions across the BFD session.

extensive

Min slow interval

Minimum amount of time, in seconds, between synchronous control packet transmissions across the BFD session.

extensive

Adaptive async tx interval

Transmission interval being used because of adaptation.

extensive

rx interval

Minimum required receive interval.

extensive

Local min tx interval

Minimum amount of time, in seconds, between control packet transmissions on the local system.

extensive

Local min rx interval

Minimum amount of time, in seconds, between control packet detections on the local system.

extensive

Remote min tx interval

Minimum amount of time, in seconds, between control packet transmissions on the remote system.

extensive

Remote min rx interval

Minimum amount of time, in seconds, between control packet detections on the remote system.

extensive

Threshold transmission interval

Threshold for notification if the transmission interval increases.

extensive

Threshold for detection time

Threshold for notification if the detection time increases.

extensive

Local discriminator

Authentication code used by the local system to identify that BFD session.

extensive

Remote discriminator

Authentication code used by the remote system to identify that BFD session.

extensive

Echo mode

Information about the state of echo transmissions on the BFD session.

extensive

Prefix

LDP FEC address associated with the BFD session.

All levels

Egress, Destination

Displays the LDP FEC destination address. This field is displayed only on a router at the egress of an LDP FEC, where the BFD session has an LDP Operation, Administration, and Maintenance (OAM) client.

All levels

Remote is control-plane independent

The BFD session on the remote peer is running on its Packet Forwarding Engine. In this case, when the remote node undergoes a graceful restart, the local peer can help the remote peer with the graceful restart.

The following BFD sessions are not distributed to the Packet Forwarding Engine: multihop sessions, tunnel-encapsulated sessions, and sessions over aggregated Ethernet and integrated routing and bridging (IRB) interfaces.

extensive

Session count

Total number of active BFD sessions.

All levels

Client count

Total number of clients that are hosting active BFD sessions.

All levels

Cumulative transmit rate

Total number of BFD control packets transmitted per second on all active sessions.

All levels

Cumulative receive rate

Total number of BFD control packets received per second on all active sessions.

All levels

Multi-hop, min-recv-TTL

Minimum TTL accepted if the session is configured for multihop.

extensive

route table

Route table used if the session is configured for multihop.

extensive

local address

Local address of source used if the session is configured for multihop.

extensive

Sample Output

show bfd session

user@host> show bfd session 
                                                          Transmit
Address              State     Interface     Detect Time  Interval  Multiplier
10.9.1.33            Up        so-7/1/0.0          0.600     0.200      3
10.9.1.29            Up        ge-4/0/0.0          0.600     0.200      3

2 sessions, 2 clients
Cumulative transmit rate 10.0 pps, cumulative receive rate 10.0 pps

show bfd session brief

The output for the show bfd session brief command is identical to that for the show bfd session command. For sample output, see show bfd session.

show bfd session detail

user@host> show bfd session detail 
                                                          Transmit
Address              State     Interface     Detect Time  Interval  Multiplier
10.9.1.33            Up        so-7/1/0.0          0.600     0.200      3
  Client OSPF, TX interval 0.200, RX interval 0.200, multiplier 3
  Session up time 3d 00:34
  Local diagnostic None, remote diagnostic None
  Remote state Up, version 1
  Replicated
10.9.1.29            Up        ge-4/0/0.0          0.600     0.200      3
  Client ISIS L2, TX interval 0.200, RX interval 0.200, multiplier 3
  Session up time 3d 00:29, previous down time 00:00:01
  Local diagnostic NbrSignal, remote diagnostic AdminDown
  Remote state Up, version 1

2 sessions, 2 clients
Cumulative transmit rate 10.0 pps, cumulative receive rate 10.0 pps

show bfd session address

user@host> show bfd session 10.255.245.212 extensive 
                                                          Transmit
Address              State     Interface     Detect Time  Interval  Multiplier
10.255.245.212       Up                            1.200     0.400      3
  Client Static, TX interval 0.400, RX interval 0.400, multiplier 3
  Session up time 00:17:03, previous down time 00:00:14
  Local diagnostic CtlExpire, remote diagnostic NbrSignal
  Remote state Up, version 1
  Replicated
  Min async interval 0.400, min slow interval 1.000
  Adaptive async tx interval 0.400, rx interval 0.400
  Local min tx interval 0.400, min rx interval 0.400, multiplier 3
  Remote min tx interval 0.400, min rx interval 0.400, multiplier 3
  Threshold transmission interval 0.000, Threshold for detection time 0.000
  Local discriminator 6, remote discriminator 16
  Echo mode disabled/inactive
  Multi-hop, min-recv-TTL 255, route-table 0, local-address 10.255.245.205


1 sessions, 1 clients
Cumulative transmit rate 2.5 pps, cumulative receive rate 2.5 pps

show bfd session extensive

user@host> show bfd session extensive 
                                                          Transmit
Address              State     Interface     Detect Time  Interval  Multiplier
10.9.1.33            Up        so-7/1/0.0          0.600     0.200      3
  Client OSPF, TX interval 0.200, RX interval 0.200, multiplier 3
  Session up time 3d 00:34
  Local diagnostic None, remote diagnostic None
  Remote state Up, version 1
  Replicated
  Min async interval 0.200, min slow interval 1.000
  Adaptive async tx interval 0.200, rx interval 0.200
  Local min tx interval 0.200, min rx interval 0.200, multiplier 3
  Remote min tx interval 0.100, min rx interval 0.100, multiplier 3
  Threshold transmission interval 0.000, Threshold for detection time 0.000
  Local discriminator 11, remote discriminator 80
  Echo mode disabled/inactive

10.9.1.29            Up        ge-4/0/0.0          0.600     0.200      3
  Client ISIS L2, TX interval 0.200, RX interval 0.200, multiplier 3
  Session up time 3d 00:30, previous down time 00:00:01
  Local diagnostic NbrSignal, remote diagnostic AdminDown
  Remote state Up, version 1
  Replicated
  Min async interval 0.200, min slow interval 1.000
  Adaptive async tx interval 0.200, rx interval 0.200
  Local min tx interval 0.200, min rx interval 0.200, multiplier 3
  Remote min tx interval 0.200, min rx interval 0.200, multiplier 3
  Threshold transmission interval 0.000, Threshold for detection time 0.000
  Local discriminator 12, remote discriminator 11
  Echo mode disabled/inactive
  Remote is control-plane independent


2 sessions, 2 clients

Cumulative transmit rate 10.0 pps, cumulative receive rate 10.0 pps

show bfd session summary

user@host> show bfd session summary 
2 sessions, 2 clients
Cumulative transmit rate 10.0 pps, cumulative receive rate 10.0 pps
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