display bfd session verbose (IPv6)

Function

The display bfd session verbose command displays the detailed information of the BFD session for monitoring an IPv6 link.

Format

display bfd session peer-ipv6 peer-ipv6 [ vpn-instance vpn-name ] verbose

display bfd session all for-ipv6 verbose

display bfd session static for-ipv6 verbose

Parameters

Parameter	Description	Value
peer-ipv6 peer-ipv6	Displays information about the BFD session with a specified peer IPv6 address.	The value is a 32-digit hexadecimal number, in the format of X:X:X:X:X:X:X:X.
vpn-instance vpn-name	Displays information about the BFD session bound to a specified VPN instance.	The value is a string of 1 to 31 case-sensitive characters, spaces not supported. In addition, the VPN instance name must not be _public_. When double quotation marks are used around the string, spaces are allowed in the string.
verbose	Displays detailed information about BFD sessions.	-
all	Displays information about all BFD sessions.	-
for-ipv6	Displays information about the BFD session for detecting faults in IPv6 links.	-
static	Displays information about static BFD sessions.	-

Views

All views

Default Level

1: Monitoring level

Task Name and Operations

Task Name	Operations
bfd	read

Usage Guidelines

Usage Scenario

To view the detailed information of the BFD session for monitoring an IPv6 link, run the display bfd session verbose (IPv6) command.

Prerequisites

BFD has been globally enabled using the bfd command in the system view.

Example

The actual command output varies according to the device. The command output here is only an example.

# Display detailed information about all IPv6 BFD sessions.

<HUAWEI> display bfd session all for-ipv6 verbose
(w): State in WTR
(*): State is invalid
--------------------------------------------------------------------------------
  (One Hop)   State : Down                  Name : 2
--------------------------------------------------------------------------------
  Local Discriminator    : 2                Remote Discriminator   : 22 
  Session Detect Mode    : Asynchronous Mode Without Echo Function
  BFD Bind Type          : Interface(Ethernet0/1/17)  
  Bind Session Type      : Static  
  Bind Peer IP Address   : 2001:db8::1                                     
  Bind Interface         : Ethernet0/1/17                                     
  FSM Board Id           : -                TOS-EXP                : 7
  Min Tx Interval (ms)   : 10               Min Rx Interval (ms)   : 10 
  Actual Tx Interval (ms): 2011             Actual Rx Interval (ms): 2011 
  Local Detect Multi     : 3                Detect Interval (ms)   : - 
  Echo Passive           : Disable          Acl Number             : - 
  Destination Port       : 3784             TTL                    : 255 
  Proc Interface Status  : Disable          Process PST            : Disable    
  WTR Interval (ms)      : -                Config PST             : Disable    
  Active Multi           : -                  
  Last Local Diagnostic  : No Diagnostic
  Bind Application       : No Application Bind
  Session TX TmrID       : 3954979256       Session Detect TmrID   : - 
  Session Init TmrID     : -                Session WTR TmrID      : - 
  Session Echo Tx TmrID  : -   
  Session Not Up Reason  : In negotiation  
  Session Description    : - 
--------------------------------------------------------------------------------

    Total UP/DOWN Session Number : 0/1

**Table 1** Description of the **display bfd session verbose (IPv6)** command output
Item	Description
State	Status of the BFD session: Up: The BFD session is in the Up state. Down: The BFD session is in the Down state. AdminDown: The BFD session is in the AdminDown state. After the shutdown (BFD session view) command is run, the BFD session becomes AdminDown. Up(w): indicates that the BFD session is in the Up state and during the WTR time. Up()/Down(): indicates that the BFD session is in the invalid state. Init: The BFD session is in the Init state.
WTR Interval (ms)	WTR time of the BFD session.
Total UP/DOWN Session Number	UP BFD Session Number/DOWN BFD Session Number.
Session Detect Mode	Detection mode of the BFD session: Asynchronous Mode Without Echo Function. Asynchronous Mode With Echo Function. Asynchronous One-arm-echo Mode. Seamless Mode without Echo Function.
Session Not Up Reason	Cause for a session negotiation failure, displayed when a session is in the following state: Board selecting failed. In negotiation. Unsupported tunnel type.
Session Description	Description of the BFD session.
Session TX TmrID	Timer used by the BFD session to send packets.
Session Detect TmrID	Timer for BFD session detection.
Session Init TmrID	Timer for the BFD session state machine initialization.
Session WTR TmrID	WTR timer for the BFD session.
Session Echo Tx TmrID	Timer used by the BFD session to send Echo packets.
Name	Name of the BFD session.
Local Discriminator	Local discriminator of the BFD session.
Local Detect Multi	Local detection multiplier.
Remote Discriminator	Remote discriminator of the BFD session.
Detect Interval (ms)	Detection interval of the BFD session.
Echo Passive	Whether the BFD passive Echo function is enabled: Enable. Disable.
BFD Bind Type	Binding type of the BFD session: Peer Ip Address: The BFD session detects a multi-hop IP link. For the single-hop IP link to be detected, the interface and the bound local interface are displayed. Static_Auto: A static BFD session is established through automatically negotiated discriminators. SR_BE_TUNNEL: The BFD session detects an SR-MPLS BE tunnel. TE_TUNNEL: The BFD session detects a TE tunnel. TE_LSP: The BFD session detects an LSP that is bound to a TE tunnel. LDP_LSP: The BFD session detects an LDP LSP. SID_LIST: The BFD session detects the SR-MPLS TE Policy.
Bind Session Type	Establishment type of the BFD session: Static: A BFD session is established through static configuration. Dynamic: The establishment of a BFD session is triggered dynamically. Static_Auto: A static BFD session is established through automatically negotiated discriminators. Entire_Dynamic: The establishment of a BFD session is triggered dynamically, after the egress of an LSP is enabled with the function of passively creating a BFD session.
Bind Peer IP Address	Remote IP address of the BFD session.
Bind Interface	Outbound interface to which the BFD session is bound.
Bind Application	Application to which the BFD session is bound: No Application Bind is displayed if no application is bound to the BFD session. A specific application name is displayed if the application is bound to the BFD session. For example, if an interface is bound to the BFD session, IFNET is displayed.
FSM Board Id	Slot ID of the main control board of the BFD state machine.
TOS-EXP	Priority of BFD packets.
Min Tx Interval (ms)	Configured minimum interval between sending BFD packets.
Min Rx Interval (ms)	Configured minimum interval between receiving BFD packets.
Actual Tx Interval (ms)	Indicates the actual minimum interval between sending BFD packets.
Actual Rx Interval (ms)	Actual minimum interval between receiving BFD packets.
Active Multi	Active detection multiplier of the BFD session.
Destination Port	Destination port number of BFD packets.
TTL	TTL of BFD packets.
Last Local Diagnostic	Local diagnostic reason for the last Down state of the BFD session: Control Detection Time Expired. No Diagnostic. Neighbor Signaled Session Down. Administratively Down. Neighbor Signaled Session Down (Receive AdminDown). Concatenated Path Down. Reverse Concatenated Path Down.
Acl Number	ACL number applied to the BFD session.
Proc Interface Status	Status of the association between the status of a BFD session and an interface: Enable: enables the association between the status of the BFD session and the interface. Disable: disables the association between the status of the BFD session and the interface. If the process-interface-status command has been configured, the field is displayed as Enable; otherwise, the field is displayed as Disable.
Process PST	Flag of processing the PST: Enable: permits the BFD session to modify the PST. Disable: prohibits the BFD session from modifying the PST. If the process-pst command has been configured, the field is displayed as Enable; otherwise, the field is displayed as Disable.
Config PST	Indicates the ID of the configured port status table. The options are as follows: Enable: permits the BFD session to modify the port status table. Disable: prohibits the BFD session from modifying the port status table. If the process-pst command is configured, this field is displayed as Enable; otherwise, it is displayed as Disable.