Why is the rate limit for ICMP packets configured on an interface card inconsistent with the actual rate limit

An AR router implements rate limit to Layer 3 unicast packets by converting the number of packets into the number of bytes. ICMP packets are converted based on 84 bytes per packet. For example, if the rate limit configured for ICMP packets is 10, then the actual rate limit is calculated as 84 x 10 = 840 byte/s. If the actual packet length is not equal to 84 bytes, the actual rate limit will deviate from the configured value.

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