Why cannot a DAI-enabled S series switch forward valid ARP packets at line rate

For S series switches, in versions earlier than V200R001, a DAI-enabled switch checks ARP packets based on ACL rules delivered to the chip. Therefore, packets are directly forwarded at line rate. In V200R001 and later versions, a DAI-enabled switch checks ARP packets and forwards valid ARP packets using software. The forwarding rate depends on factors such as the CPCAR value of the ARP packet and CPU usage.
For E series switches, a DAI-enabled switch checks ARP packets and forwards valid ARP packets using software. The forwarding rate depends on factors such as the CPCAR value of the ARP packet and CPU usage.

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