isis bfd block
Function
The isis bfd block command prevents an IS-IS interface from dynamically establishing a BFD session.
The undo isis bfd block command restores the default setting.
By default, an interface can dynamically establish a BFD session.
Usage Guidelines
BFD can provide millisecond-level fault detection, help IS-IS rapidly detect the faults that occur on neighboring devices or links, and instruct IS-IS to recalculate routes for correct packet forwarding. If the network contains unstable links that do not require high reliability and BFD has been enabled, a link cannot transmit data normally when it flaps. You can use the isis bfd block command to prevent specified interfaces from dynamically establishing BFD sessions.
Prerequisites
IS-IS has been enabled on the interface using the isis enable command.
PrecautionsIf the isis bfd block, isis bfd enable, and isis bfd static commands are executed, only the last command takes effect.
