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BFD Configuration Commands

Created: Aug 8, 2019 06:59:27Latest reply: Aug 8, 2019 07:03:10 329 1 1 0 0
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How to display bfd session?
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  • convention:

Featured Answers
Mr.Jack
Created Aug 8, 2019 07:03:10

Function
The display bfd session command displays information about BFD sessions.
Format
display bfd session { all | static } [ for-ip | for-lsp | for-te | for-pw | for-vsi-pw ] [ verbose ]
display bfd session { discriminator discr-value | peer-ip peer-ip [ vpn-instance vpn-instance-name ] | static-auto } [ verbose ]
display bfd session { ldp-lsp peer-ip peer-ip [ nexthop nexthop-ip [ interface interface-type interface-number ] ] | mpls-te interface interface-type interface-number [ te-lsp ] | pw interface interface-type interface-number [ secondary ] } [ verbose ]
display bfd session peer-ipv6 peer-ipv6 [ vpn-instance vpn-instance-name ] [ verbose ]
display bfd session { all | static } for-ipv6 [ verbose ]
display bfd session passive-dynamic [ peer-ip peer-ip remote-discriminator discr-value ] [ verbose ]
display bfd session vsi-pw vsi vsi-name peer peer-address [ vc-id vc-id ] [ verbose ]
display bfd session peer-ip { peer-address [ vpn-instance vpn-instance-name ] | default-ip } [ verbose ]
display bfd session mpls-te interface {interface-type interface-number }[ te-lsp ] [ verbose ]
display bfd session dynamic [ verbose ]
display bfd session ldp-lsp peer-ip peer-ip [ nexthop nexthop-ip [ interface {interface-type interface-number } ] ]
display bfd session { all | static } [ for-lsp] [ verbose ]
display bfd session bgp-tunnel peer-ip bgp-tunnel-address [ verbose ]
display bfd session sr-be-tunnel peer-ip peer-ip [ verbose ]
Parameters
Parameter Description Value
all Displays information about all BFD sessions. -
static Displays information about static BFD sessions. -
passive-dynamic Displays information about the BFD sessions that are passively created. -
dynamic Displays information about dynamic and statically self-negotiated BFD sessions. -
discriminator discr-value Displays information about the BFD sessions with a specified local discriminator. The value is an integer ranging from 1 to 4294967295.
remote-discriminator discr-value Displays information about the BFD sessions with a specified remote discriminator. The value is an integer ranging from 1 to 4294967295.
peer-ip peer-ip Displays information about the BFD session with a specified peer IP address. The value is in dotted decimal notation.
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.
nexthop nexthop-ip Displays information about the BFD session with a specified next-hop IP address. The value is in dotted decimal notation.
interface interface-type interface-number Displays information about the BFD session with a specified interface. -
vpn-instance vpn-instance-name Displays information about the BFD session bound to a specified VPN instance.
static-auto Displays information about the BFD session with automatically negotiated discriminators. -
for-ip Displays information about the BFD session for detecting faults in IP links. -
for-ipv6 Displays information about the BFD session for detecting faults in IPv6 links. -
for-lsp Displays information about the BFD, LDP LSP session for detecting faults in LSPs. -
for-te Displays information about the BFD, TE TUNNLE, TE LSP session for detecting faults in TE tunnels. -
for-pw Displays information about the BFD session for detecting faults in a PW. -
for-vsi-pw Displays information about the BFD session for detecting faults in a VSI PW. -
ldp-lsp Displays information about the BFD session for detecting faults in an LDP LSP. -
mpls-te Displays information about the BFD session for detecting faults in MPLS TE tunnels. -
te-lsp Displays information about the BFD session for detecting faults in the primary CR-LSP bound to the TE tunnel. -
pw Displays information about the BFD session for detecting faults in a PW. -
secondary Displays statistics about a BFD session for monitoring a secondary PW. -
vsi-pw Displays information about the BFD session for detecting faults in a VSI PW. -
vsi vsi-name Specifies the VSI name. The value is a string of 1 to 31 characters.
peer peer-address Specifies the IPv4 address of the peer of the VSI PW. The value is in dotted decimal notation.
vc-id vc-id Specifies the ID of a Layer 2 VC. The value is an integer ranging from 1 to 4294967295.
peer-ip default-ip Displays statistics about BFD sessions with the default multicast address. The value is in dotted decimal notation.
verbose Displays detailed information about BFD sessions. -
bgp-tunnel Displays information about a BFD session that monitors a BGP Tunnel. -
peer-ip bgp-tunnel-address Specifies the peer IP address of a BGP tunnel. The value is in dotted decimal notation.
sr-be-tunnel Displays information about a BFD session that monitors an SR-BE tunnel. -
Views
All views
Default Level
1: Monitoring level
Task Name and Operations
Task Name Operations
bfd read
Usage Guidelines
Usage Scenario
To view information about BFD sessions, run the display bfd session command with one or more of the following parameters:
• If only all is configured, information about all BFD sessions is displayed. You can also configure the parameter all and one of the following parameters:
 If for-ip is configured, information about all BFD sessions for detecting faults in IP links is displayed.
 If for-ipv6 is configured, information about all BFD sessions for detecting faults in IPv6 links is displayed.
 If for-lsp is configured, information about all BFD sessions for detecting faults in LSPs is displayed.
 If for-te is configured, information about all BFD sessions for detecting faults in TE tunnels is displayed.
• If only static is configured, information about static BFD sessions is displayed. You can also configure the parameter static and one of the following parameters:
 If for-ip is configured, information about the static BFD sessions for detecting faults in IP links is displayed.
 If for-ipv6 is configured, information about all BFD sessions for detecting faults in IPv6 links is displayed.
 If for-lsp is configured, information about the static BFD sessions for detecting faults in LSPs is displayed.
 If for-te is configured, information about the static BFD sessions for detecting faults in TE tunnels is displayed.
• If only passive-dynamic is configured, information about the passively created BFD sessions is displayed.
• If only peer-ip peer-ip discriminator discr-value is configured, information about the BFD sessions with the specified remote IP address and local discriminator is displayed.
• If only dynamic is configured, information about dynamic BFD sessions is displayed.
• If only discriminator discr-value is configured, information about the BFD sessions with the specified local discriminator is displayed.
• If only peer-ip peer-ip is configured, information about the BFD sessions with the specified peer IP address is displayed.
• If only peer-ipv6 peer-ipv6, information about the BFD sessions with the specified peer IPv6 address is displayed.
• If only peer-ip peer-ip [ vpn-instance vpn-instance-name ] is configured, information about the BFD sessions with the specified remote IP address and bound to the specified VPN instance is displayed.
• If only static-auto is configured, information about the BFD sessions with automatically negotiated discriminators is displayed.
• If only ldp-lsp peer-ip peer-ip is configured, information about the BFD sessions for detecting faults in LDP LSPs is displayed.
• If only mpls-te interface interface-type interface-number is configured, information about the BFD sessions for detecting faults in TE tunnels is displayed.
• If only segment-list segment-list-id is configured, information about the BFD sessions with the specified SR Policy is displayed.
Prerequisites
BFD has been globally enabled using the bfd command in the system view.
Precautions
• When the BFD session changes from Down to Up, and the WTR time is not zero, the notification that the BFD session goes Up can be received only after the WTR time expires.
• If a static BFD session with automatically negotiated discriminators and a dynamic BFD session have the same configurations, you can view that the shared BFD session belongs to both the static session with automatically negotiated discriminators and the dynamic session in terms of the BFD session type.
• The display bfd session dynamic command displays information about both dynamic and static sessions. The statically self-negotiated sessions are treated as dynamic sessions.
Example
# Display brief information about all BFD sessions.
<HUAWEI> display bfd session all
(w): State in WTR
(*): State is invalid
------------------------------------------------------------------------------
Local Remote PeerIpAddr State Type InterfaceName
------------------------------------------------------------------------------
111 222 10.10.10.2 Up S_IP_IF GigabitEthernet2/0/0
------------------------------------------------------------------------------
Total UP/DOWN Session Number : 1/0
Table 1 Description of the display bfd session all command output
Item Description
Local Local discriminator of the BFD session
Remote Remote discriminator of the BFD session
PeerIpAddr Remote IP address of the BFD session
State Status of the BFD session:
• Up: The BFD session is in the Up state.
• Down: The BFD session is in the Down state.
• AdmDown: 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.
Type Type of the BFD session:
• S_IP_PEER: indicates a session created statically and bound to an IP link.
• S_IP_IF: indicates a session created statically and bound to an interface.
• D_IP_PEER: indicates a session created dynamically and bound to an IP link.
• D_IP_IF: indicates a session created dynamically and bound to an interface.
• E_Dynamic: indicates the entirely dynamic session, after the egress of an LSP is enabled with the function of passively creating a BFD session.
• S_AUTO_IF: indicates the static single-hop BFD session with automatically negotiated discriminators.
• S_AUTO_PEER: indicates the static multi-hop BFD session with automatically negotiated discriminators.
• D_SR_BE_TNL: indicates a session created dynamically and bound to an SR-BE tunnel.
• S_TE_LSP: indicates a session created statically and bound to a TE LSP.
• S_TE_TNL: indicates a session created statically and bound to a TE tunnel.
• D_TE_LSP: indicates a session created statically and bound to a TE LSP.
• S_LDP_LSP: indicates a session created dynamically and bound to a dynamic LSP.
• D_LDP_LSP: indicates a session created dynamically and bound to a dynamic LSP.
• D_TE_TNL: indicates a session created dynamically and bound to a TE tunnel.
InterfaceName Outbound interface to which the BFD session is bound. For a multi-hop BFD session, "-" is displayed because no interface is bound to the BFD session.
Total UP/DOWN Session Number UP BFD Session Number/DOWN BFD Session Number
# Display detailed information about all BFD sessions.
<HUAWEI> display bfd session all verbose
(w): State in WTR
(*): State is invalid
--------------------------------------------------------------------------------
(One Hop) State : Up Name : atob
------------------------------------------------------------------------------
Local Discriminator : 111 Remote Discriminator : 222
Session Detect Mode : Asynchronous Mode Without Echo Function
BFD Bind Type : Interface(GigabitEthernet2/0/0)
Bind Session Type : Static
Bind Peer IP Address : 10.10.10.2
Bind Interface : GigabitEthernet2/0/0
FSM Board Id : 1 TOS-EXP : 7
Min Tx Interval (ms) : 10 Min Rx Interval (ms) : 10
Actual Tx Interval (ms): 2000 Actual Rx Interval (ms): 2000
Local Detect Multi : 3 Detect Interval (ms) : 30
Echo Passive : Disable Acl Number : -
Destination Port : 4784 TTL : 254
Proc Interface Status : Disable Process PST : Disable
WTR Interval (ms) : 0 Config PST : Enable
Active Multi : 0
Last Local Diagnostic : No Diagnostic
Bind Application : No Application Bind
Session TX TmrID : 2369967508 Session Detect TmrID : -
Session Init TmrID : - Session WTR TmrID : -
Session Echo Tx TmrID : -
Session Description : -
------------------------------------------------------------------------------

Total UP/DOWN Session Number : 1/0
Table 2 Description of the display bfd session all verbose 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.
Name Name of the BFD session
Local Discriminator Local discriminator of the BFD session
Remote Discriminator Remote discriminator of the BFD session
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
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-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.
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 Source Ip Address Source IP address of the local interface bound to the BFD session, which is displayed only when the source IP address is specified for the BFD session using the bfd bind peer-ip command

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
Local Detect Multi Local detection multiplier
Detect Interval(ms) Detection interval of the BFD session
Echo Passive Whether the BFD passive Echo function is enabled:
• Enable
• Disable
Acl Number ACL number applied to the BFD session
Destination Port Destination port number of BFD packets
TTL TTL of BFD packets
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.
WTR Interval(ms) WTR time of the BFD session
Active Multi Active detection multiplier of the BFD session
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
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.
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
Session Not Up Reason Cause for a session negotiation failure, displayed when a session is in the following state:
• Board selecting failed
• In negotiation
Session Description Description of the BFD session

View more
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All Answers
Mr.Jack
Mr.Jack Created Aug 8, 2019 07:03:10

Function
The display bfd session command displays information about BFD sessions.
Format
display bfd session { all | static } [ for-ip | for-lsp | for-te | for-pw | for-vsi-pw ] [ verbose ]
display bfd session { discriminator discr-value | peer-ip peer-ip [ vpn-instance vpn-instance-name ] | static-auto } [ verbose ]
display bfd session { ldp-lsp peer-ip peer-ip [ nexthop nexthop-ip [ interface interface-type interface-number ] ] | mpls-te interface interface-type interface-number [ te-lsp ] | pw interface interface-type interface-number [ secondary ] } [ verbose ]
display bfd session peer-ipv6 peer-ipv6 [ vpn-instance vpn-instance-name ] [ verbose ]
display bfd session { all | static } for-ipv6 [ verbose ]
display bfd session passive-dynamic [ peer-ip peer-ip remote-discriminator discr-value ] [ verbose ]
display bfd session vsi-pw vsi vsi-name peer peer-address [ vc-id vc-id ] [ verbose ]
display bfd session peer-ip { peer-address [ vpn-instance vpn-instance-name ] | default-ip } [ verbose ]
display bfd session mpls-te interface {interface-type interface-number }[ te-lsp ] [ verbose ]
display bfd session dynamic [ verbose ]
display bfd session ldp-lsp peer-ip peer-ip [ nexthop nexthop-ip [ interface {interface-type interface-number } ] ]
display bfd session { all | static } [ for-lsp] [ verbose ]
display bfd session bgp-tunnel peer-ip bgp-tunnel-address [ verbose ]
display bfd session sr-be-tunnel peer-ip peer-ip [ verbose ]
Parameters
Parameter Description Value
all Displays information about all BFD sessions. -
static Displays information about static BFD sessions. -
passive-dynamic Displays information about the BFD sessions that are passively created. -
dynamic Displays information about dynamic and statically self-negotiated BFD sessions. -
discriminator discr-value Displays information about the BFD sessions with a specified local discriminator. The value is an integer ranging from 1 to 4294967295.
remote-discriminator discr-value Displays information about the BFD sessions with a specified remote discriminator. The value is an integer ranging from 1 to 4294967295.
peer-ip peer-ip Displays information about the BFD session with a specified peer IP address. The value is in dotted decimal notation.
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.
nexthop nexthop-ip Displays information about the BFD session with a specified next-hop IP address. The value is in dotted decimal notation.
interface interface-type interface-number Displays information about the BFD session with a specified interface. -
vpn-instance vpn-instance-name Displays information about the BFD session bound to a specified VPN instance.
static-auto Displays information about the BFD session with automatically negotiated discriminators. -
for-ip Displays information about the BFD session for detecting faults in IP links. -
for-ipv6 Displays information about the BFD session for detecting faults in IPv6 links. -
for-lsp Displays information about the BFD, LDP LSP session for detecting faults in LSPs. -
for-te Displays information about the BFD, TE TUNNLE, TE LSP session for detecting faults in TE tunnels. -
for-pw Displays information about the BFD session for detecting faults in a PW. -
for-vsi-pw Displays information about the BFD session for detecting faults in a VSI PW. -
ldp-lsp Displays information about the BFD session for detecting faults in an LDP LSP. -
mpls-te Displays information about the BFD session for detecting faults in MPLS TE tunnels. -
te-lsp Displays information about the BFD session for detecting faults in the primary CR-LSP bound to the TE tunnel. -
pw Displays information about the BFD session for detecting faults in a PW. -
secondary Displays statistics about a BFD session for monitoring a secondary PW. -
vsi-pw Displays information about the BFD session for detecting faults in a VSI PW. -
vsi vsi-name Specifies the VSI name. The value is a string of 1 to 31 characters.
peer peer-address Specifies the IPv4 address of the peer of the VSI PW. The value is in dotted decimal notation.
vc-id vc-id Specifies the ID of a Layer 2 VC. The value is an integer ranging from 1 to 4294967295.
peer-ip default-ip Displays statistics about BFD sessions with the default multicast address. The value is in dotted decimal notation.
verbose Displays detailed information about BFD sessions. -
bgp-tunnel Displays information about a BFD session that monitors a BGP Tunnel. -
peer-ip bgp-tunnel-address Specifies the peer IP address of a BGP tunnel. The value is in dotted decimal notation.
sr-be-tunnel Displays information about a BFD session that monitors an SR-BE tunnel. -
Views
All views
Default Level
1: Monitoring level
Task Name and Operations
Task Name Operations
bfd read
Usage Guidelines
Usage Scenario
To view information about BFD sessions, run the display bfd session command with one or more of the following parameters:
• If only all is configured, information about all BFD sessions is displayed. You can also configure the parameter all and one of the following parameters:
 If for-ip is configured, information about all BFD sessions for detecting faults in IP links is displayed.
 If for-ipv6 is configured, information about all BFD sessions for detecting faults in IPv6 links is displayed.
 If for-lsp is configured, information about all BFD sessions for detecting faults in LSPs is displayed.
 If for-te is configured, information about all BFD sessions for detecting faults in TE tunnels is displayed.
• If only static is configured, information about static BFD sessions is displayed. You can also configure the parameter static and one of the following parameters:
 If for-ip is configured, information about the static BFD sessions for detecting faults in IP links is displayed.
 If for-ipv6 is configured, information about all BFD sessions for detecting faults in IPv6 links is displayed.
 If for-lsp is configured, information about the static BFD sessions for detecting faults in LSPs is displayed.
 If for-te is configured, information about the static BFD sessions for detecting faults in TE tunnels is displayed.
• If only passive-dynamic is configured, information about the passively created BFD sessions is displayed.
• If only peer-ip peer-ip discriminator discr-value is configured, information about the BFD sessions with the specified remote IP address and local discriminator is displayed.
• If only dynamic is configured, information about dynamic BFD sessions is displayed.
• If only discriminator discr-value is configured, information about the BFD sessions with the specified local discriminator is displayed.
• If only peer-ip peer-ip is configured, information about the BFD sessions with the specified peer IP address is displayed.
• If only peer-ipv6 peer-ipv6, information about the BFD sessions with the specified peer IPv6 address is displayed.
• If only peer-ip peer-ip [ vpn-instance vpn-instance-name ] is configured, information about the BFD sessions with the specified remote IP address and bound to the specified VPN instance is displayed.
• If only static-auto is configured, information about the BFD sessions with automatically negotiated discriminators is displayed.
• If only ldp-lsp peer-ip peer-ip is configured, information about the BFD sessions for detecting faults in LDP LSPs is displayed.
• If only mpls-te interface interface-type interface-number is configured, information about the BFD sessions for detecting faults in TE tunnels is displayed.
• If only segment-list segment-list-id is configured, information about the BFD sessions with the specified SR Policy is displayed.
Prerequisites
BFD has been globally enabled using the bfd command in the system view.
Precautions
• When the BFD session changes from Down to Up, and the WTR time is not zero, the notification that the BFD session goes Up can be received only after the WTR time expires.
• If a static BFD session with automatically negotiated discriminators and a dynamic BFD session have the same configurations, you can view that the shared BFD session belongs to both the static session with automatically negotiated discriminators and the dynamic session in terms of the BFD session type.
• The display bfd session dynamic command displays information about both dynamic and static sessions. The statically self-negotiated sessions are treated as dynamic sessions.
Example
# Display brief information about all BFD sessions.
<HUAWEI> display bfd session all
(w): State in WTR
(*): State is invalid
------------------------------------------------------------------------------
Local Remote PeerIpAddr State Type InterfaceName
------------------------------------------------------------------------------
111 222 10.10.10.2 Up S_IP_IF GigabitEthernet2/0/0
------------------------------------------------------------------------------
Total UP/DOWN Session Number : 1/0
Table 1 Description of the display bfd session all command output
Item Description
Local Local discriminator of the BFD session
Remote Remote discriminator of the BFD session
PeerIpAddr Remote IP address of the BFD session
State Status of the BFD session:
• Up: The BFD session is in the Up state.
• Down: The BFD session is in the Down state.
• AdmDown: 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.
Type Type of the BFD session:
• S_IP_PEER: indicates a session created statically and bound to an IP link.
• S_IP_IF: indicates a session created statically and bound to an interface.
• D_IP_PEER: indicates a session created dynamically and bound to an IP link.
• D_IP_IF: indicates a session created dynamically and bound to an interface.
• E_Dynamic: indicates the entirely dynamic session, after the egress of an LSP is enabled with the function of passively creating a BFD session.
• S_AUTO_IF: indicates the static single-hop BFD session with automatically negotiated discriminators.
• S_AUTO_PEER: indicates the static multi-hop BFD session with automatically negotiated discriminators.
• D_SR_BE_TNL: indicates a session created dynamically and bound to an SR-BE tunnel.
• S_TE_LSP: indicates a session created statically and bound to a TE LSP.
• S_TE_TNL: indicates a session created statically and bound to a TE tunnel.
• D_TE_LSP: indicates a session created statically and bound to a TE LSP.
• S_LDP_LSP: indicates a session created dynamically and bound to a dynamic LSP.
• D_LDP_LSP: indicates a session created dynamically and bound to a dynamic LSP.
• D_TE_TNL: indicates a session created dynamically and bound to a TE tunnel.
InterfaceName Outbound interface to which the BFD session is bound. For a multi-hop BFD session, "-" is displayed because no interface is bound to the BFD session.
Total UP/DOWN Session Number UP BFD Session Number/DOWN BFD Session Number
# Display detailed information about all BFD sessions.
<HUAWEI> display bfd session all verbose
(w): State in WTR
(*): State is invalid
--------------------------------------------------------------------------------
(One Hop) State : Up Name : atob
------------------------------------------------------------------------------
Local Discriminator : 111 Remote Discriminator : 222
Session Detect Mode : Asynchronous Mode Without Echo Function
BFD Bind Type : Interface(GigabitEthernet2/0/0)
Bind Session Type : Static
Bind Peer IP Address : 10.10.10.2
Bind Interface : GigabitEthernet2/0/0
FSM Board Id : 1 TOS-EXP : 7
Min Tx Interval (ms) : 10 Min Rx Interval (ms) : 10
Actual Tx Interval (ms): 2000 Actual Rx Interval (ms): 2000
Local Detect Multi : 3 Detect Interval (ms) : 30
Echo Passive : Disable Acl Number : -
Destination Port : 4784 TTL : 254
Proc Interface Status : Disable Process PST : Disable
WTR Interval (ms) : 0 Config PST : Enable
Active Multi : 0
Last Local Diagnostic : No Diagnostic
Bind Application : No Application Bind
Session TX TmrID : 2369967508 Session Detect TmrID : -
Session Init TmrID : - Session WTR TmrID : -
Session Echo Tx TmrID : -
Session Description : -
------------------------------------------------------------------------------

Total UP/DOWN Session Number : 1/0
Table 2 Description of the display bfd session all verbose 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.
Name Name of the BFD session
Local Discriminator Local discriminator of the BFD session
Remote Discriminator Remote discriminator of the BFD session
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
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-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.
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 Source Ip Address Source IP address of the local interface bound to the BFD session, which is displayed only when the source IP address is specified for the BFD session using the bfd bind peer-ip command

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
Local Detect Multi Local detection multiplier
Detect Interval(ms) Detection interval of the BFD session
Echo Passive Whether the BFD passive Echo function is enabled:
• Enable
• Disable
Acl Number ACL number applied to the BFD session
Destination Port Destination port number of BFD packets
TTL TTL of BFD packets
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.
WTR Interval(ms) WTR time of the BFD session
Active Multi Active detection multiplier of the BFD session
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
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.
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
Session Not Up Reason Cause for a session negotiation failure, displayed when a session is in the following state:
• Board selecting failed
• In negotiation
Session Description Description of the BFD session

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