The bfd all-interfaces command sets values for BFD session parameters.
The undo bfd all-interfaces command restores the default values.
By default, the BFD session will setup with default values of parameters.
bfd all-interfaces { min-rx-interval receive-interval | min-tx-interval transmit-interval | detect-multiplier multiplier-value | frr-binding | tos-exp tosexp-value } *
undo bfd all-interfaces { min-rx-interval [ receive-interval ] | min-tx-interval [ transmit-interval ] | detect-multiplier [ multiplier-value ] | frr-binding | tos-exp [ tosexp-value ] } *
| Parameter | Description | Value |
|---|---|---|
| min-rx-interval receive-interval |
Specifies the expected minimum interval at which BFD packets are received from a neighbor. |
The value is an integer ranging from 3 to 20000, in milliseconds. The default value is 10. |
| min-tx-interval transmit-interval |
Specifies the minimum interval at which BFD packets are sent to a neighbor. |
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 is an integer ranging from 3 to 50. The default value is 3. |
| frr-binding |
Associates BFD session status with IS-IS auto FRR. If BFD detects a link fault on an interface, the BFD session goes Down, triggering FRR. Traffic is then quickly switched to the backup link, minimizing service loss. |
- |
| tos-exp tosexp-value |
Sets a priority for all IS-IS BFD packets of the current process. |
The value is an integer ranging from 0 to 7. |
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 bfd all-interfaces command can be used to set values for BFD session parameters.
Prerequisites
BFD has been enabled globally, An IS-IS process has been created, the IS-IS process has been enabled on a specified interface, and BFD has been enabled in the IS-IS process.
Configuration Impact
The minimum interval at which BFD packets are received is obtained after the negotiation between the local receive-interval and the remote transmit-interval. If the local end does not receive any BFD packet from its neighbor within the period (minimum interval at which BFD packets are received x multiplier-value), the local end declares the neighbor Down.
Precautions
If only BFD session parameters are set and the bfd all-interfaces enable command is not run, no BFD session can be established.
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, a BFD session is established according to the BFD parameters set on the interface.