Usage Scenario
If a device is attacked, it receives a large number of ND Miss 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 receiving ND Miss messages based on any source IPv6 address. After the configuration is complete, the device counts the number of ND Miss messages received per period based on any source IPv6 address. If the number exceeds the configured limit, the device does not process excess ND Miss messages.
Configuration Impact
After a rate limit for receiving ND Miss messages based on any source IPv6 address is configured, the device counts the number of ND Miss messages received per period based on any source IPv6 address. If the number of ND Miss messages exceeds the configured limit, the device does not process excess ND Miss messages. As a result, the device may fail to process valid ND Miss messages, causing user service interruptions.
Precautions
If a low rate limit is configured and the login through Telnet fails because the device receives a large number of attack packets, you can log in to the device through the console port to increase the rate limit.