By configuring proxy ARP on a VLAN, you can interconnect isolated hosts on a VLAN.
Before configuring proxy ARP within a VLAN, complete the following tasks:
Configuring the VLAN
Configuring user isolation in the VLAN
If two users are in the same VLAN but they are isolated from each other, to ensure the two users can communicate, you need to enable proxy ARP within the VLAN on the interface associated with the VLAN.
system-view
interface vlanif vlan-id
ip address ip-address { mask | mask-length }
arp-proxy inner-sub-vlan-proxy enable