Why cannot an S series switches learn ARP entries after Layer 3 forwarding is enabled on the switch's sub-interfaces

Q: Why cannot a switch learn ARP entries when connected to other devices after Layer 3 forwarding is enabled on the switch's sub-interfaces?
A: In V100R002 and later versions, sub-interfaces of S series switches do not respond to ARP requests by default when Layer 3 forwarding is enabled on the sub-interfaces. The sub-interfaces respond to ARP requests only after the arp-proxy enable command is executed.

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