The isis bfd command configures BFD session parameters.
The undo isis bfd command restores the default values.
The isis bfd enable command enables BFD on an IS-IS interface to establish BFD sessions using default parameters.
The undo isis bfd enable command disables BFD from the IS-IS interface.
By default, the minimum interval at which BFD packets are received and the minimum interval at which BFD packets are sent are 10 ms, and the local detection multiple is 3.
By default, BFD is not enabled.
| Parameter | Description | Value |
|---|---|---|
| min-tx-interval transmit-interval |
Specifies the minimum interval at which BFD packets are sent to the peer end. |
The value is an integer ranging from 3 to 20000, in milliseconds. The default value is 10. |
| min-rx-interval receive-interval |
Specifies the minimum interval at which BFD packets are received from the peer end. |
The value is an integer ranging from 3 to 20000, in milliseconds. The default value is 10. |
| detect-multiplier multiplier-value |
Specifies a local detection multiplier. |
The value ranges from 3 to 50. |
| frr-binding |
Binds the status of the BFD session to IS-IS Auto FRR. When BFD detects a link fault on the interface, the BFD session goes Down, triggering FRR on the interface. Then, traffic is switched from the faulty link to the backup link. |
- |
| tos-exp tosexp-value |
Sets a priority for all IS-IS BFD packets of the current interface. |
The value is an integer ranging from 0 to 7. |
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Usage Scenario
BFD can provide millisecond-level fault detection, help IS-IS to detect the faults that occur on neighboring devices or links more quickly, and instruct IS-IS to recalculate routes for correct packet forwarding. The isis bfd command can be used to set values for BFD session parameters on an interface. To enable BFD on an IS-IS interface to establish BFD sessions using default parameters, run the isis bfd enable command.
Prerequisites
BFD has been enabled globally, and the isis bfd enable command has been run on the interface.
BFD has been enabled globally, and An IS-IS process has been created on the interface.Precautions
The priority of BFD configured on an interface is higher than that of BFD configured in a process. If BFD is enabled on an interface, BFD sessions are established with the BFD parameters set on the interface.
The set BFD session parameters take effect only when BFD is enabled on the interface. If BFD is not enabled globally, you can set BFD parameters on an interface but the interface cannot establish BFD sessions. If the isis bfd block, isis bfd enable, and isis bfd static commands are run, only the last command takes effect.<HUAWEI> system-view [~HUAWEI] isis 1 [*HUAWEI-isis-1] quit [*HUAWEI] interface GigabitEthernet0/1/0 [*HUAWEI-GigabitEthernet0/1/0] isis enable 1 [*HUAWEI-GigabitEthernet0/1/0] isis bfd enable [*HUAWEI-GigabitEthernet0/1/0] isis bfd min-rx-interval 400 detect-multiplier 4
<HUAWEI> system-view [~HUAWEI] isis 1 [*HUAWEI-isis-1] quit [*HUAWEI] interface GigabitEthernet0/1/0 [*HUAWEI-GigabitEthernet0/1/0] isis enable 1 [~HUAWEI-GigabitEthernet0/1/0] isis bfd enable