The ipv6 nd na send rate-limit command configures a rate limit for sending ND NA messages on an interface, that is, the maximum number of ND NA messages that can be sent per second.
The undo ipv6 nd na send rate-limit command restores the default configuration.
By default, the rate limit for sending ND NA messages is not configured on an interface, and ND NA messages are sent at a globally configured rate limit.
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Usage Scenario
If a device is attacked, it receives a large number of messages within a short period. As a result, the device consumes many CPU resources to learn and respond to ND entries, affecting the processing of other services. To resolve this issue, configure a rate limit for sending ND NA messages on the corresponding interface. After the configuration is complete, the device counts the number of ND NA messages sent per period. If the number exceeds the configured limit, the device delays scheduling or ignores excess ND NA messages.