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| Title | Size | Download |
|---|---|---|
| 09-BFD commands | 126.58 KB |
bfd detect-interface first-fail-timer
bfd detect-interface special-processing
bfd multi-hop authentication-mode
bfd multi-hop destination-port
bfd multi-hop detect-multiplier
bfd multi-hop min-receive-interval
bfd multi-hop min-transmit-interval
BFD commands
Basic BFD commands
bfd authentication-mode
Use bfd authentication-mode to configure the BFD authentication mode for single-hop BFD control packets.
Use undo bfd authentication-mode to restore the default.
Syntax
bfd authentication-mode { hmac-md5 | hmac-mmd5 | hmac-msha1 | hmac-sha1 | m-md5 | m-sha1 | md5 | sha1 | simple } key-id { cipher | plain } string
undo bfd authentication-mode
Default
Single-hop BFD control packets are not authenticated.
Views
Interface view
BFD template view
Predefined user roles
network-admin
Parameters
hmac-md5: Specifies the HMAC MD5 algorithm.
hmac-mmd5: Specifies the HMAC Meticulous MD5 algorithm.
hmac-msha1: Specifies the HMAC Meticulous SHA1 algorithm.
hmac-sha1: Specifies the HMAC SHA1 algorithm.
m-md5: Specifies the Meticulous MD5 algorithm.
m-sha1: Specifies the Meticulous SHA1 algorithm.
md5: Specifies the MD5 algorithm.
sha1: Specifies the SHA1 algorithm.
simple: Specifies the simple authentication mode.
key-id: Sets the authentication key ID in the range of 1 to 255.
cipher: Specifies a key in encrypted form.
plain: Specifies a key in plaintext form. For security purposes, the key specified in plaintext form will be stored in encrypted form.
string: Specifies the key. Its plaintext form is a case-sensitive string of 1 to 16 characters. Its encrypted form is a case-sensitive string of 33 to 53 characters.
Usage guidelines
Use this command to enhance BFD session security.
BFD version 0 does not support this command. The configuration does not take effect.
Examples
# Configure VLAN-interface 11 to perform simple authentication for single-hop BFD control packets, setting the authentication key ID to 1 and plaintext key to 123456.
<Sysname> system-view
[Sysname] interface vlan-interface 11
[Sysname-Vlan-interface11] bfd authentication-mode simple 1 plain 123456
bfd demand enable
Use bfd demand enable to enable the Demand BFD session mode.
Use undo bfd demand enable to restore the default.
Syntax
bfd demand enable
undo bfd demand enable
Default
The BFD session is in Asynchronous mode.
Views
Interface view
Predefined user roles
network-admin
Usage guidelines
In Demand mode, the device periodically sends BFD control packets. If the peer end is operating in Asynchronous mode (default), the peer end stops sending BFD control packets. If the peer end is operating in Demand mode, both ends stop sending BFD control packets. When the connectivity to another system needs to be verified explicitly, a system sends several BFD control packets with the Poll (P) bit set at the negotiated transmit interval. If no response is received within the detection interval, the session is considered down. If the connectivity is found to be up, no more BFD control packets are sent until the next command is issued.
In Asynchronous mode, the device periodically sends BFD control packets. The device considers that the session is down if it does not receive any BFD control packets within a specific interval.
BFD version 0 does not support this command. The configuration does not take effect.
Examples
# Enable the Demand BFD session mode on VLAN-interface 11.
<Sysname> system-view
[Sysname] interface vlan-interface 11
[Sysname-Vlan-interface11] bfd demand enable
bfd detect-interface
Use bfd detect-interface source-ip to create a BFD session for detecting the local interface state.
Use undo bfd detect-interface to remove the BFD session.
Syntax
bfd detect-interface source-ip ip-address [ discriminator local local-value remote remote-value ] [ template template-name ]
undo bfd detect-interface
Default
No BFD session is created for detecting the local interface state.
Views
Interface view
Predefined user roles
network-admin
Parameters
ip-address: Specifies the source IP address for BFD control packets.
discriminator: Specifies BFD session discriminators. If you do not specify discriminators, the device obtains BFD session discriminators through autonegotiation.
local local-value: Specifies the local discriminator. The value range for the local-value argument is 97 to 128.
remote remote-value: Specifies the remote discriminator in the range of 1 to 4294967295.
template template-name: Specifies a template by its name, a case-sensitive string of 1 to 63 characters. If you do not specify a template, the BFD session uses the BFD parameters configured in interface view.
Usage guidelines
This command implements fast collaboration between interface state and BFD session state. When BFD detects a link fault, it sets the link layer protocol state to DOWN(BFD). This behavior helps applications relying on the link layer protocol state achieve fast convergence.
The source IP address of control packets is specified manually, and the destination IP address is fixed at 224.0.0.184. As a best practice, specify the IP address of the interface as the source IP address. If the interface does not have an IP address, specify a unicast IP address other than 0.0.0.0 as the source IP address.
You can associate the state of the following interfaces with BFD:
· Layer 2 Ethernet interfaces.
· Member ports in a Layer 2 aggregation group.
· VLAN interfaces.
· Layer 2 aggregate interfaces.
This command must be executed on both ends of the link for a BFD session to be established.
If you execute both the bfd detect-interface and bfd echo enable commands for an interface, only the bfd detect-interface command takes effect.
For BFD detection to take effect, do not execute this command on both a Layer 2 Ethernet interface and the VLAN interface created for the VLAN to which the Layer 2 Ethernet interface is assigned.
For BFD detection to take effect, do not execute this command on the following interfaces at the same time:
· A Layer 2 aggregate interface.
· A member port of the Layer 2 aggregate interface.
· The VLAN interface to which the Layer 2 aggregate interface belongs.
If the peer device does not support obtaining BFD session discriminators through autonegotiation, you must specify the discriminators on both the local and peer devices. Without the discriminators, the BFD session cannot come up.
The BFD session discriminators must match on the local and peer devices. For example, if you configure bfd detect-interface source-ip 20.1.1.1 discriminator local 513 remote 514 on the local device, you must configure bfd detect-interface source-ip 20.1.1.2 discriminator local 514 remote 513 on the peer device.
The local discriminators of BFD sessions for interfaces on the same device must be different.
Examples
# Create a BFD session to detect the state of VLAN-interface 10, and specify the source IP address as 20.1.1.1.
<Sysname> system-view
[Sysname] interface vlan-interface 10
[Sysname-Vlan-interface10] bfd detect-interface source-ip 20.1.1.1
bfd detect-interface first-fail-timer
Use bfd detect-interface first-fail-timer to configure the timer that delays reporting the first BFD session establishment failure to the data link layer.
Use undo bfd detect-interface first-fail-timer to restore the default.
Syntax
bfd detect-interface first-fail-timer seconds
undo bfd detect-interface first-fail-timer
Default
The first BFD session establishment failure is not reported to the data link layer.
Views
Interface view
Predefined user roles
network-admin
Parameters
seconds: Specifies the timeout time that reports the first BFD session establishment failure to the data link layer. The value range for this argument is 1 to 10000 seconds.
Usage guidelines
If the BFD session fails to be established when the timer expires, BFD reports the failure to the data link layer and sets the data link layer state of the interface to DOWN(BFD). This behavior rapidly identifies the interfaces for which BFD sessions fail to be established. In this case, the BFD session state is displayed as Down in the display bfd session command output. The line protocol state of the interface is displayed as DOWN(BFD) in the display interface command output.
If the local end is configured with the bfd detect-interface command, the BFD session for detecting the local interface state fails to be established when the following conditions exist:
· The remote end is not configured with the bfd detect-interface command.
· The local and remote ends have mismatching BFD authentication settings.
Examples
# Configure the timer that delays reporting the first BFD session establishment failure as 10 seconds.
<Sysname> system-view
[Sysname] interface vlan-interface 11
[Sysname-Vlan-interface11] bfd detect-interface first-fail-timer 10
Related commands
bfd detect-interface
display interface (Interface Command Reference)
bfd detect-interface special-processing
Use bfd detect-interface special-processing to enable special processing for BFD sessions.
Use undo bfd detect-interface special-processing to disable special processing for BFD sessions.
Syntax
bfd detect-interface special-processing [ admin-down | authentication-change | session-up ] *
undo bfd detect-interface special-processing [ admin-down | authentication-change | session-up ] *
Default
All types of special processing for BFD sessions are disabled.
Views
Interface view
Predefined user roles
network-admin
Parameters
admin-down: Notifies a session down event to the data link layer upon receipt of a BFD packet with the State field as AdminDown. This keyword helps rapidly discover interfaces that BFD sessions are manually shut down. If you do not specify this keyword, the device sets the BFD session state to Down, but does not notify the session down event to the data link layer.
authentication-change: Immediately sets the session to down state upon a local authentication information change. This keyword helps rapidly discover interfaces with authentication information changes. If you do not specify this keyword, the device sets the session to down state if authentication information inconsistency still persists after a period of time.
session-up: Ignores authentication information inconsistency when the local session is up. If there is a large number of BFD sessions, examining authentication information consistency affects device performance. If you do not specify this keyword, the device examines authentication information in incoming BFD packets when the local session state is up. If the authentication information does not match on the two ends, the BFD session is declared down.
Usage guidelines
If you do not specify any parameters, this command enables or disables all types of special processing.
Examples
# Enable all types of special processing for BFD sessions on VLAN-interface 11.
<Sysname> system-view
[Sysname] interface vlan-interface 11
[Sysname-Vlan-interface11] bfd detect-interface special-processing admin-down authentication-change session-up
bfd detect-multiplier
Use bfd detect-multiplier to set the single-hop detection time multiplier for control packet mode and the detection time multiplier for echo packet mode.
Use undo bfd detect-multiplier to restore the default.
Syntax
bfd detect-multiplier value
undo bfd detect-multiplier
Default
The single-hop detection time multiplier for control packet mode and the detection time multiplier for echo packet mode are both 5.
Views
Interface view
BFD template view
Predefined user roles
network-admin
Parameters
value: Specifies a detection time multiplier. The value range for this argument is 3 to 50.
Usage guidelines
The detection time multiplier determines the maximum number of concurrent BFD packets (including control packets and echo packets) that can be discarded.
Table 1 Actual detection interval calculation method
|
Mode |
Actual detection interval of the sender |
|
Echo packet mode |
Detection time multiplier of the sender × actual packet sending interval of the sender |
|
Control packet mode BFD session in asynchronous mode |
Detection time multiplier of the receiver × MAX (minimum receiving interval supported by the sender, minimum sending interval supported by the receiver) |
|
Control packet mode BFD session in demand mode |
Detection time multiplier of the sender × MAX (minimum sending interval supported by the sender, minimum receiving interval supported by the receiver) |
Examples
# Set the single-hop detection time multiplier for control packet mode and the detection time multiplier for echo packet mode to 6 on VLAN-interface 11.
<Sysname> system-view
[Sysname] interface vlan-interface 11
[Sysname-Vlan-interface11] bfd detect-multiplier 6
bfd echo enable
Use bfd echo enable to enable the echo packet mode.
Use undo bfd echo enable to disable the echo packet mode.
Syntax
bfd echo [ receive | send ] enable
undo bfd echo [ receive | send ] enable
Default
The echo packet mode is disabled.
Views
Interface view
Predefined user roles
network-admin
Parameters
receive: Specifies the echo packet receiving capability.
send: Specifies the echo packet sending capability.
Usage guidelines
If you enable the echo packet mode for a BFD session in which control packets are sent and the session comes up, BFD performs the following operations:
· Periodically sends echo packets to detect link connectivity.
· Decreases the control packet receiving rate at the same time.
To enable only the echo packet receiving capability, use the bfd echo receive enable command.
To enable only the echo packet sending capability, use the bfd echo send enable command.
If you do not specify the receive or send keyword, the command enables both the echo packet receiving and sending capabilities.
If you configure both the bfd detect-interface and bfd echo enable commands for an interface, only the bfd detect-interface command takes effect.
BFD version 0 does not support this command. The configuration does not take effect.
Examples
# Enable the echo packet mode on VLAN-interface 11.
<Sysname> system-view
[Sysname] interface vlan-interface 11
[Sysname-Vlan-interface11] bfd echo enable
bfd echo-source-ip
Use bfd echo-source-ip to configure the source IP address of BFD echo packets.
Use undo bfd echo-source-ip to remove the configured source IP address of BFD echo packets.
Syntax
bfd echo-source-ip ip-address
undo bfd echo-source-ip
Default
No source IP address is configured for BFD echo packets.
Views
System view
Predefined user roles
network-admin
Parameters
ip-address: Specifies the source IP address of BFD echo packets.
Usage guidelines
The source IP address cannot be on the same network segment as any local interface's IP address. Otherwise, a large number of ICMP redirect packets might be sent from the peer, resulting in link congestion.
Examples
# Configure the source IP address of BFD echo packets as 8.8.8.8.
<Sysname> system-view
[Sysname] bfd echo-source-ip 8.8.8.8
bfd echo-source-ipv6
Use bfd echo-source-ipv6 to configure the source IPv6 address of BFD echo packets.
Use undo bfd echo-source-ipv6 to remove the configured source IPv6 address of BFD echo packets.
Syntax
bfd echo-source-ipv6 ipv6-address
undo bfd echo-source-ipv6
Default
No source IPv6 address is configured for BFD echo packets.
Views
System view
Predefined user roles
network-admin
Parameters
ipv6-address: Specifies the source IPv6 address for BFD echo packets.
Usage guidelines
The source IPv6 address of echo packets can only be a global unicast address.
The source IPv6 address cannot be on the same network segment as any local interface's IP address. Otherwise, a large number of ICMP redirect packets might be sent from the peer, resulting in link congestion.
Examples
# Configure the source IPv6 address of BFD echo packets as 80::2.
<Sysname> system-view
[Sysname] bfd echo-source-ipv6 80::2
bfd min-echo-receive-interval
Use bfd min-echo-receive-interval to set the minimum interval for receiving BFD echo packets.
Use undo bfd min-echo-receive-interval to restore the default.
Syntax
bfd min-echo-receive-interval interval
undo bfd min-echo-receive-interval
Default
The minimum interval for receiving BFD echo packets is 400 milliseconds.
Views
Interface view
Predefined user roles
network-admin
Parameters
interval: Specifies the minimum interval for receiving BFD echo packets, in milliseconds. The value takes 0 or is in the range of 100 to 1000.
Usage guidelines
This command sets the BFD echo packet receiving interval, which is the actual BFD echo packet sending interval.
The local end stops sending echo packets after autonegotiation with the remote end if the following conditions are met:
· The echo packet mode is enabled on the local end.
· The minimum interval for receiving BFD echo packets is set to 0 milliseconds on the remote end.
Examples
# Set the minimum interval for receiving BFD echo packets to 500 milliseconds on VLAN-interface 11.
<Sysname> system-view
[Sysname] interface vlan-interface 11
[Sysname-Vlan-interface11] bfd min-echo-receive-interval 500
bfd min-receive-interval
Use bfd min-receive-interval to set the minimum interval for receiving single-hop BFD control packets.
Use undo bfd min-receive-interval to restore the default.
Syntax
bfd min-receive-interval interval
undo bfd min-receive-interval
Default
The minimum interval for receiving single-hop BFD control packets is 400 milliseconds.
Views
Interface view
BFD template view
Predefined user roles
network-admin
Parameters
interval: Specifies the minimum interval for receiving single-hop BFD control packets, in milliseconds. The value range is 100 to 1000.
Usage guidelines
Use this command to prevent the control packet sending rate of the peer end from exceeding the control packet receiving rate of the local end.
The actual control packet sending interval of the peer end takes the greater value between the following values:
· Minimum interval for transmitting BFD control packets on the peer end.
· Minimum interval for receiving BFD control packets on the local end.
Examples
# Set the minimum interval for receiving single-hop BFD control packets to 500 milliseconds on VLAN-interface 11.
<Sysname> system-view
[Sysname] interface vlan-interface 11
[Sysname-Vlan-interface11] bfd min-receive-interval 500
bfd min-transmit-interval
Use bfd min-transmit-interval to set the minimum interval for transmitting single-hop BFD control packets.
Use undo bfd min-transmit-interval to restore the default.
Syntax
bfd min-transmit-interval interval
undo bfd min-transmit-interval
Default
The minimum interval for transmitting single-hop BFD control packets is 400 milliseconds.
Views
Interface view
BFD template view
Predefined user roles
network-admin
Parameters
interval: Specifies the minimum interval for transmitting single-hop BFD control packets, in milliseconds. The value range is 100 to 1000.
Usage guidelines
Use this command to prevent the BFD packet sending rate from exceeding the device capability.
The actual BFD control packet transmitting interval on the local end is the greater value between the following values:
· Minimum interval for transmitting BFD control packets on the local end.
· Minimum interval for receiving BFD control packets on the peer end.
Examples
# Set the minimum interval for transmitting single-hop BFD control packets to 500 milliseconds on VLAN-interface 11.
<Sysname> system-view
[Sysname] interface vlan-interface 11
[Sysname-Vlan-interface11] bfd min-transmit-interval 500
bfd multi-hop authentication-mode
Use bfd multi-hop authentication-mode to configure the authentication mode for multihop BFD control packets.
Use undo bfd multi-hop authentication-mode to restore the default.
Syntax
bfd multi-hop authentication-mode { hmac-md5 | hmac-mmd5 | hmac-msha1 | hmac-sha1 | m-md5 | m-sha1 | md5 | sha1 | simple } key-id { cipher | plain } string
undo bfd multi-hop authentication-mode
Default
No authentication is performed.
Views
System view
Predefined user roles
network-admin
Parameters
hmac-md5: Specifies the HMAC MD5 algorithm.
hmac-mmd5: Specifies the HMAC Meticulous MD5 algorithm.
hmac-msha1: Specifies the HMAC Meticulous SHA1 algorithm.
hmac-sha1: Specifies the HMAC SHA1 algorithm.
m-md5: Specifies the Meticulous MD5 algorithm.
m-sha1: Specifies the Meticulous SHA1 algorithm.
md5: Specifies the MD5 algorithm.
sha1: Specifies the SHA1 algorithm.
simple: Specifies the simple authentication mode.
key-id: Sets the authentication key ID in the range of 1 to 255.
cipher: Specifies a key in encrypted form.
plain: Specifies a key in plaintext form. For security purposes, the key specified in plaintext form will be stored in encrypted form.
string: Specifies the key. Its plaintext form is a case-sensitive string of 1 to 16 characters. Its encrypted form is a case-sensitive string of 33 to 53 characters.
Usage guidelines
Use this command to enhance BFD session security.
BFD version 0 does not support this command. The configuration does not take effect.
Examples
# Configure the simple authentication mode for multihop BFD control packets, setting the authentication key ID to 1 and key to 123456.
<Sysname> system-view
[Sysname] bfd multi-hop authentication-mode simple 1 plain 123456
bfd multi-hop destination-port
Use bfd multi-hop destination-port to configure the destination port number for multihop BFD control packets.
Use undo bfd multi-hop destination-port to restore the default.
Syntax
bfd multi-hop destination-port port-number
undo bfd multi-hop destination-port
Default
The destination port number for multihop BFD control packets is 4784.
Views
System view
Predefined user roles
network-admin
Parameters
port-number: Specifies the destination port number of multihop BFD control packets, 3784 or 4784.
Examples
# Specify the destination port number for multihop BFD control packets as 3784.
<Sysname> system-view
[Sysname] bfd multi-hop destination-port 3784
bfd multi-hop detect-multiplier
Use bfd multi-hop detect-multiplier to set the multihop detection time multiplier for control packet mode.
Use undo bfd multi-hop detect-multiplier to restore the default.
Syntax
bfd multi-hop detect-multiplier value
undo bfd multi-hop detect-multiplier
Default
The multihop detection time multiplier for control packet mode is 5.
Views
System view
Predefined user roles
network-admin
Parameters
value: Specifies the multihop detection time multiplier in the range of 3 to 50.
Usage guidelines
The detection time multiplier determines the maximum number of concurrent BFD control packets that can be discarded.
Table 2 Actual detection interval calculation method
|
Mode |
Actual detection interval of the sender |
|
Control packet mode BFD session in asynchronous mode |
Detection time multiplier of the receiver × MAX (minimum receiving interval supported by the sender, minimum sending interval supported by the receiver) |
|
Control packet mode BFD session in demand mode |
Detection time multiplier of the sender × MAX (minimum sending interval supported by the sender, minimum receiving interval supported by the receiver) |
Examples
# Set the multihop detection time multiplier to 6.
<Sysname> system-view
[Sysname] bfd multi-hop detect-multiplier 6
bfd multi-hop min-receive-interval
Use bfd multi-hop min-receive-interval to set the minimum interval for receiving multihop BFD control packets.
Use undo bfd multi-hop min-receive-interval to restore the default.
Syntax
bfd multi-hop min-receive-interval interval
undo bfd multi-hop min-receive-interval
Default
The minimum interval for receiving multihop BFD control packets is 400 milliseconds.
Views
System view
Predefined user roles
network-admin
Parameters
interval: Specifies the minimum interval for receiving multihop BFD control packets, in milliseconds. The value range is 100 to 1000.
Usage guidelines
Use this command to prevent the packet sending rate of the peer end from exceeding the packet receiving capability (minimum control packet receiving interval) of the local end. If the receiving capability is exceeded, the peer end dynamically adjusts the BFD control packet sending interval to the minimum control packet receiving interval of the local end.
Examples
# Set the minimum interval for receiving multihop BFD control packets to 500 milliseconds.
<Sysname> system-view
[Sysname] bfd multi-hop min-receive-interval 500
bfd multi-hop min-transmit-interval
Use bfd multi-hop min-transmit-interval to set the minimum interval for transmitting multihop BFD control packets.
Use undo bfd multi-hop min-transmit-interval to restore the default.
Syntax
bfd multi-hop min-transmit-interval interval
undo bfd multi-hop min-transmit-interval
Default
The minimum interval for transmitting multihop BFD control packets is 400 milliseconds.
Views
System view
Predefined user roles
network-admin
Parameters
interval: Specifies the minimum interval for transmitting multihop BFD control packets, in milliseconds. The value range is 100 to 1000.
Usage guidelines
Use this command to prevent the BFD packet sending rate from exceeding the device capability.
The actual BFD control packet transmitting interval on the local end is the greater value between the following values:
· Minimum interval for transmitting BFD control packets on the local end.
· Minimum interval for receiving BFD control packets on the peer end.
Examples
# Set the minimum interval for transmitting multihop BFD control packets to 500 milliseconds.
<Sysname> system-view
[Sysname] bfd multi-hop min-transmit-interval 500
bfd session init-mode
Use bfd session init-mode to configure the mode for establishing a BFD session.
Use undo bfd session init-mode to restore the default.
Syntax
bfd session init-mode { active | passive }
undo bfd session init-mode
Default
BFD uses the active mode.
Views
System view
Predefined user roles
network-admin
Parameters
active: Specifies the active mode. In active mode, BFD actively transmits BFD control packets to the remote device, regardless of whether it receives a BFD control packet from the remote device.
passive: Specifies the passive mode. In passive mode, BFD does not actively transmit a BFD control packet to the remote end; it transmits a BFD control packet only after receiving a BFD control packet from the remote end.
Usage guidelines
A minimum of one end must operate in active mode for a BFD session to be established.
BFD version 0 does not support this command. The configuration does not take effect.
Examples
# Configure the session establishment mode as passive.
<Sysname> system-view
[Sysname] bfd session init-mode passive
bfd template
Use bfd template to create a BFD template and enter its view, or enter the view of an existing BFD template.
Use undo bfd template to delete the BFD template.
Syntax
bfd template template-name
undo bfd template template-name
Default
No BFD templates exist.
Views
System view
Predefined user roles
network-admin
Parameters
template-name: Specifies the template name, a case-sensitive string of 1 to 63 characters.
Examples
# Create BFD template bfd1 and enter BFD template view.
<Sysname> system-view
[Sysname] bfd template bfd1
[Sysname-bfd-template-bfd1]
display bfd session
Use display bfd session to display BFD session information.
Syntax
display bfd session [ discriminator value | verbose ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
discriminator value: Specifies a local ID in the range of 1 to 4294967295. If this option is not specified, the command displays brief information about all BFD sessions.
verbose: Displays detailed BFD session information. If this keyword is not specified, the command displays brief BFD session information.
Examples
# Display brief information about all IPv4 BFD sessions.
<Sysname> display bfd session
Total Session Num: 1 Up Session Num: 1 Init Mode: Active
IPv4 session working in control packet mode:
LD/RD SourceAddr DestAddr State Holdtime Interface
513/513 1.1.1.1 1.1.1.2 Up 2297ms Vlan100
# Display detailed IPv4 BFD session information.
<Sysname> display bfd session verbose
Total Session Num: 1 Up Session Num: 1 Init Mode: Active
IPv4 session working in control packet mode:
Local Discr: 513 Remote Discr: 513
Source IP: 1.1.1.1 Destination IP: 1.1.1.2
Session State: Up Interface: Vlan-interface100
Min Tx Inter: 500ms Act Tx Inter: 500ms
Min Rx Inter: 500ms Detect Inter: 2500ms
Rx Count: 42 Tx Count: 43
Connect Type: Direct Running Up for: 00:00:20
Hold Time: 2078ms Auth mode: None
Detect Mode: Async Slot: 0
Protocol: OSPF
Version:1
Diag Info: No Diagnostic
# Display brief information about all IPv6 BFD sessions.
<Sysname> display bfd session
Total Session Num: 1 Up Session Num: 1 Init Mode: Active
IPv6 session working in control packet mode:
Local Discr: 513 Remote Discr: 513
Source IP: FE80::20C:29FF:FED4:7171
Destination IP: FE80::20C:29FF:FE72:AC4D
Session State: Up Interface: Vlan100
Hold Time: 2142ms
# Display detailed IPv6 BFD session information.
<Sysname> display bfd session verbose
Total Session Num: 1 Up Session Num: 1 Init Mode: Active
IPv6 session working in control packet mode:
Local Discr: 513 Remote Discr: 513
Source IP: FE80::20C:29FF:FED4:7171
Destination IP: FE80::20C:29FF:FE72:AC4D
Session State: Up Interface: Vlan-interface100
Min Tx Inter: 500ms Act Tx Inter: 500ms
Min Rx Inter: 500ms Detect Inter: 2500ms
Rx Count: 38 Tx Count: 38
Connect Type: Direct Running Up for: 00:00:15
Hold Time: 2211ms Auth mode: None
Detect Mode: Async Slot: 0
Protocol: OSPFv3
Version:1
Diag Info: No Diagnostic
|
Field |
Description |
|
Total Session Num |
Total number of BFD sessions. |
|
Up Session Num |
Total number of active BFD sessions. |
|
Init Mode |
BFD operating mode: Active or passive. |
|
IPv4 session working in control packet mode |
BFD session type and operating mode: · IPv4 session working in control packet mode. · IPv4 session working in echo mode. · IPv6 session working in control packet mode. · IPv6 session working in echo mode. |
|
Local Discr/LD |
Local discriminator of the session. |
|
Remote Discr/RD |
Remote discriminator of the session. |
|
Source IP/SourceAddr |
Source IP address of the session. |
|
Destination IP/DestAddr |
Destination IP address of the session. |
|
Session State/State |
Session state: Down, Init, or Up. |
|
Interface |
Name of the interface of the session. |
|
Min Tx Inter |
Minimum BFD packet transmission interval. |
|
Min Rx Inter |
Minimum BFD packet receiving interval. |
|
Act Tx Inter |
Actual BFD packet transmission interval. |
|
Detect Inter |
Actual session detection timer. |
|
Rx Count |
Number of packets received. |
|
Tx Count |
Number of packets sent. |
|
Hold Time/Holdtime |
Length of time before the session detection timer expires, in milliseconds. For a BFD session in Down state, this field displays 0ms. |
|
Auth mode |
Session authentication mode. |
|
Connect Type |
Connection type of the interface: Direct or indirect. |
|
Running up for |
Time period for which the session has been up. |
|
Detect Mode |
Detection mode: · Async—Asynchronous mode. · Demand—Demand mode. · Async/Echo—Asynchronous mode with echo detection enabled. · Demand/Echo—Demand mode with echo detection enabled. |
|
Slot |
Slot number. |
|
Diag Info |
Diagnostic information about the session: · No Diagnostic. · Control Detection Time Expired—A control packet mode BFD session goes down because local detection times out. · Echo Function Failed—An echo packet mode BFD session goes down, because local detection times out or the source IP address of echo packets is deleted. · Neighbor Signaled Session Down—The remote end notifies the local end of BFD session down. · Administratively Down—The local system prevents a BFD session from being established. |
reset bfd session statistics
Use reset bfd session statistics to clear the BFD session statistics.
Syntax
reset bfd session statistics
Views
User view
Predefined user roles
network-admin
Examples
# Clear the BFD session statistics.
<Sysname> reset bfd session statistics
snmp-agent trap enable bfd
Use snmp-agent trap enable bfd to enable SNMP notifications for BFD.
Use undo snmp-agent trap enable bfd to disable SNMP notifications for BFD.
Syntax
snmp-agent trap enable bfd
undo snmp-agent trap enable bfd
Default
All SNMP notifications are enabled for BFD.
Views
System view
Predefined user roles
network-admin
Usage guidelines
To report critical BFD events to an NMS, enable SNMP notifications for BFD. For BFD event notifications to be sent correctly, you must also configure SNMP as described in the network management and monitoring configuration guide for the device.
Examples
# Disable SNMP notifications for BFD.
<Sysname> system-view
[Sysname] undo snmp-agent trap enable bfd
