The isis ipv6 bfd block command disables an interface from dynamically establishing IPv6 BFD sessions.
The undo isis ipv6 bfd block command cancels the configuration.
By default, no interface is disabled from dynamically establishing IPv6 BFD sessions.
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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. To enable all IS-IS interfaces to dynamically establish IPv6 BFD sessions, run the ipv6 bfd all-interfaces enable command on the interfaces. To disable an interface from dynamically establishing IPv6 BFD sessions, run the isis ipv6 bfd block command.
Prerequisites
BFD has been enabled globally, and the IS-IS process has been started on a specified interface.
Configuration Impact
After the isis ipv6 bfd block command is run on an interface, the interface is disabled from dynamically establishing BFD sessions. As a result, fast link fault detection cannot be implemented.
Precautions
If the isis ipv6 bfd block, isis ipv6 bfd enable, and isis ipv6 bfd static commands are run, only the last command takes effect.
<HUAWEI> system-view [~HUAWEI] isis 1 [*HUAWEI-isis-1] ipv6 enable [*HUAWEI-isis-1] quit [*HUAWEI] interface GigabitEthernet0/1/0 [*HUAWEI-GigabitEthernet0/1/0] ipv6 enable [*HUAWEI-GigabitEthernet0/1/0] isis ipv6 enable 1 [*HUAWEI-GigabitEthernet0/1/0] isis ipv6 bfd block