The ipv6 enable command enables the IPv6 capability on an interface.
The undo ipv6 enable command disables the IPv6 capability on an interface.
By default, the IPv6 capability is disabled on an interface.
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Usage Scenario
You can perform other IPv6 configurations on an interface only when IPv6 is enabled in the interface view.
Configuration Impact
After the IPv6 function is disabled on the interface, the IPv6 addresses of the interface are deleted and IPv6-related commands no longer can be configured on the interface.
Follow-up Procedure
Perform IPv6-related configurations, including configuring IPv6 addresses and ND-related parameters (M flag, O flag, RA halt flag, interval for sending RA messages, lifetime of RA messages, interval for sending NS messages, DAD times, time period during which the IPv6 neighbor keeps reachable, prefix carried in the RA message, and static ND entries).
Precautions
After you disable IPv6 on an interface, IPv6-related configurations are removed. For example, after IPv6 is disabled on an interface, IS-IS IPv6 and RIPng on the interface are also disabled. That is, the isis ipv6 enable and ripng enable commands become invalid. The ipv6 enable and ccc commands cannot be used together. If both commands are used, IPv6 routes cannot be used to forward traffic.