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Fat AP and Cloud AP V200R010C00 Command Reference

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
display bfd session

display bfd session

Function

The display bfd session command displays information about BFD sessions.

Format

display bfd session { all | static } [ for-ip ] [ verbose ]

display bfd session { dynamic | discriminator discr-value | peer-ip { default-ip | peer-ip } } [ verbose ]

Parameters

Parameter Description Value
all Displays all configurations of BFD sessions. -
static Displays the configuration of a static BFD session. -
for-ip Displays the configuration of a BFD session that monitors an IP link. -
verbose Displays detailed information about the BFD configuration. -
dynamic Displays information about all dynamic BFD sessions and the static BFD sessions with auto-negotiated discriminators. -
discriminator discr-value Displays information about a BFD session with a specified discriminator. You can specify a local discriminator only. A decimal integer ranging from 1 to 16383
peer-ip peer-ip Displays information about a BFD session bound to the peer with a specified IP address. Expressed in dotted decimal notation
peer-ip default-ip Display statistics about a BFD session with a default multicast address. -

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

Usage Scenario

The display bfd session command displays information about BFD sessions.

Prerequisites

BFD has been enabled globally.

Precautions

  • When a BFD session changes from Down to Up, if the WTR time of the session is not 0, BFD sends a notification that the session becomes Up only after the WTR time expires.
  • If a static BFD session with automatically negotiated discriminators and a dynamic BFD session are bound to the same peer IP address, the display bfd session command displays the same entry for the static BFD session or dynamic BFD session.

Example

# Display the summary of all BFD sessions.

<Huawei> display bfd session all
--------------------------------------------------------------------------------
Local Remote     PeerIpAddr      State     Type        InterfaceName            
--------------------------------------------------------------------------------
2     1          192.168.40.1    Up        S_IP_IF     Vlanif100                
--------------------------------------------------------------------------------
     Total UP/DOWN Session Number : 1/0  
Table 25-4  Description of the display bfd session all command output

Item

Description

Local

Local discriminator of the BFD session.

To set the local discriminator, run the discriminator command.

Remote

Remote discriminator of the BFD session.

To set the remote discriminator, run the discriminator command.

PeerIpAddr

Peer IP address bound to the BFD session.

InterfaceName

Outbound interface bound to the BFD session. In multi-hop BFD, this field is displayed as - - because no interface is bound to a BFD session.

State

BFD session status:
  • Up: indicates that the BFD session is in Up state.

  • Down: indicates that the BFD session is in Down state.

  • AdmDown: indicates that a BFD session is AdminDown when the shutdown (BFD session view) command is run.

Type

BFD session type:
  • S_IP_PEER: indicates a BFD session that is established statically and bound to an IP link.

  • S_IP_IF: indicates a BFD session that is established statically and bound to an interface.

  • D_IP_PEER: indicates a BFD session that is created dynamically and bound to an IP link.

  • D_IP_IF: indicates a BFD session that is established dynamically and bound to an interface.

  • S_AUTO_IF: indicates a static single-hop BFD session with automatically negotiated discriminators.

  • S_AUTO_PEER: indicates a static multi-hop BFD session with automatically negotiated discriminators.

Total UP/DOWN Session Number :

Number of BFD sessions in Up or Down state.

# Display detailed information about all BFD sessions.

<Huawei> display bfd session all verbose
--------------------------------------------------------------------------------
Session MIndex : 16        (One Hop) State : Up        Name : atob              
--------------------------------------------------------------------------------
  Local Discriminator    : 1               Remote Discriminator   : 2         
  Session Detect Mode    : Asynchronous Mode Without Echo Function              
  BFD Bind Type          : Interface(Vlanif100)                                 
  Bind Session Type      : Static                                               
  Bind Peer IP Address   : 192.168.40.1                                         
  NextHop Ip Address     : 192.168.40.1                                         
  Bind Interface         : Vlanif100                                            
  FSM Board Id           : 0                TOS-EXP                : 7          
  Min Tx Interval (ms)   : 30               Min Rx Interval (ms)   : 30         
  Actual Tx Interval (ms): 30               Actual Rx Interval (ms): 30         
  Local Detect Multi     : 3                Detect Interval (ms)   : 90         
  Echo Passive           : Disable          Acl Number             : -          
  Destination Port       : 3784             TTL                    : 255        
  Proc Interface Status  : Disable          Process PST            : Disable    
  WTR Interval (ms)      : -                                                    
  Active Multi           : 3                DSCP                   : -          
  Last Local Diagnostic  : No Diagnostic                                        
  Bind Application       : No Application Bind                                  
  Session TX TmrID       : -                Session Detect TmrID   : -          
  Session Init TmrID     : -                Session WTR TmrID      : -          
  Session Echo Tx TmrID  : -                                                    
  PDT Index              : FSM-0 | RCV-0 | IF-0 | TOKEN-0                       
  Session Description    : -                                                    
--------------------------------------------------------------------------------
                                                                                
     Total UP/DOWN Session Number : 1/0  
Table 25-5  Description of the display bfd session all verbose verbose command output

Item

Specification

Session MIndex

Index of session entries.

State

BFD session status:
  • Up: indicates that the BFD session is in Up state.
  • Down: indicates that the BFD session is in Down state.
  • AdmDown: indicates that a BFD session is AdminDown when the shutdown(BFD session view) command is run.

Name

Name of a BFD session.

Local Discriminator

Local discriminator of the BFD session.

Remote Discriminator

Remote discriminator of the BFD session.

Session Detect Mode

BFD detection modes:
  • Asynchronous Mode Without Echo Function: indicates the asynchronous mode without the echo function.

  • Demand Mode Without Echo Function: indicates the demand mode without the echo function.

BFD Bind Type

BFD session binding type:
  • Peer IP Address: indicates that a multi-hop IP link is detected.

  • When one-hop BFD is used to detect an IP link, this field is displayed as Interface and the name of the bound local interface.

  • Static_Auto: indicates the BFD session with automatically negotiated discriminators.

Bind Session Type

Mode in which a BFD session is established:
  • Static: indicates that a BFD session is established manually.

  • Dynamic: indicates that a BFD session is established dynamically.

  • Static_Auto: indicates that a BFD session is established with automatically negotiated discriminators.

Bind Peer IP Address

Peer IP address bound to the BFD session.

NextHop Ip Address

Nexthop IP address bound to the BFD session.

Bind Interface

Outbound interface bound to the BFD session.

Bind Source IP Address

Source IP address of the local interface bound to the BFD session

The field can be displayed only when the source IP address is specified for the BFD session in the bfd bind peer-ip source-ip auto, bfd bind peer-ip or bfd bind peer-ip default-ip command.

FSM Board Id

Number of the processing board where the state machine works.

TOS-EXP

Priority of a BFD packet.

Min Tx Interval(ms)

Configured minimum interval for sending BFD packets.

Min Rx Interval(ms)

Configured minimum interval for receiving BFD packets.

Actual Tx Interval(ms)

Actual minimum interval for sending BFD packets.

Actual Rx Interval(ms)

Actual minimum interval for receiving BFD packets.

Local Detect Multi

Local detection multiplier.

Detect Interval(ms)

BFD detection time.

Echo Passive

Echo function:

  • Disable

  • Enable

Acl Number

ACL rule.

Destination Port

Number of the destination port of a BFD control packet. The single-hop BFD control packet uses destination port 3784 and the multi-hop BFD control packet uses destination port 3784 or 4784.

TTL

TTL value of BFD packets.

Proc Interface Status

Flag of association between the BFD session status and the interface status. This field is displayed as Disable.

Flag of association between the BFD session status and the interface status. If the process-interface-status command is configured, this field is displayed as Enable. Otherwise, it is displayed as Disable.

Process PST

Flag for processing the Port Status Table (PST).

WTR Interval (ms)

WTR time of the BFD session.

Active Multi

Detection multiplier that is effective.

DSCP

DSCP value in the BFD session. The value ranges from 1 to 63. The value - indicates that the DSCP value does not take effect in the BFD session.

Last Local Diagnostic

Cause for the last BFD session in Down state:
  • Control Detection Time Expired
  • No Diagnostic
  • Neighbor Signaled Session Down

Bind Application

Application bound to the BFD session.
  • If a BFD session is not bound to an application, this field is displayed as "No Application Bind."

  • If a BFD session is bound to an application, this field is displayed as the detailed application.

Session TX TmrID

Timer used for a BFD session to send packets.

Session Detect TmrID

BFD session detection timer.

Session Init TmrID

Timer for state machine initialization of a BFD session.

Session WTR TmrID

WTR timer of a BFD session.

Session Echo Tx TmrID

Timer used for a BFD session to send Echo packets.

PDT Index

Product information.

Session Description

Description of the BFD session.

Total UP/DOWN Session Number

Number of BFD sessions in Up or Down state.

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Updated: 2019-11-21

Document ID: EDOC1100064352

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