ipv6 bfd all-interfaces enable (IS-IS)
Function
The ipv6 bfd all-interfaces enable command enables IPv6 BFD for IS-IS globally in the IS-IS process.
The undo ipv6 bfd all-interfaces enable command disables IPv6 BFD for IS-IS globally in the IS-IS process.
By default, IPv6 BFD for IS-IS is disabled in the IS-IS process.
Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.
Usage Guidelines
Usage Scenario
IPv6 BFD for IS-IS can provide millisecond level fault detection, help IS-IS to detect faults on neighboring devices or links rapidly, and instruct IS-IS to recalculate routes for correct packet forwarding.
Prerequisites
The ipv6 bfd all-interfaces enable command can take effect only after global BFD is enabled by the bfd and IPv6 is enabled for the IS-IS process by the ipv6 enable command.
Configuration Impact
After the ipv6 bfd all-interfaces enable command is run, all the interfaces in the IS-IS process are automatically enabled with IPv6 BFD for IS-IS. IS-IS establishes IPv6 BFD sessions on the interfaces whose IS-IS IPv6 neighbor status is Up (the DIS is Up on the broadcast network) by using the default IPv6 BFD parameters.
After the ipv6 bfd all-interfaces enable command is run, if you start the IS-IS process on the IS-IS interface that is not enabled with the IS-IS process, the interface is also automatically enabled with IPv6 BFD for IS-IS.
After the ipv6 bfd all-interfaces enable command is run, check whether all the interfaces need to be enabled with IPv6 BFD for IS-IS according to network planning. If some interfaces do not need to be enabled with IPv6 BFD for IS-IS, run the isis ipv6 bfd block command on these interfaces to block IPv6 BFD for IS-IS.
Precautions
If IPv6 BFD for IS-IS is neither enabled globally nor enabled on interfaces, you can configure IPv6 BFD parameters of IS-IS; however, IPv6 BFD sessions cannot be established.