(Optional) Enabling Proxy ARP on the VLANIF Interface Corresponding to a Super-VLAN
Context
VLAN aggregation allows sub-VLANs to use the same subnet address, but prevents PCs in different sub-VLANs from communicating with each other over Layer 3.
PCs in common VLANs can communicate with each other over Layer 3 using different gateway addresses. VLAN aggregation enables PCs in a super-VLAN to use the same subnet address and gateway address. Because PCs in different sub-VLANs belong to one subnet, they can only communicate with PCs in their sub-VLAN. PCs in different sub-VLANs cannot communicate with each other.
Proxy ARP is required to enable PCs in a sub-VLAN to communicate with PCs in another sub-VLAN or PCs on other networks. After a super-VLAN and its VLANIF interface are created, proxy ARP must be enabled to allow the super-VLAN to forward or process ARP Request and Reply packets.
After proxy ARP is enabled on the VLANIF interface corresponding to a super-VLAN, PCs in all sub-VLANs of the super-VLAN can communicate. If PCs in some sub-VLANs of the super-VLAN need to communicate, see How Do I Implement Communication Between Specific Sub-VLANs in a Super-VLAN.
VLAN aggregation simplifies configurations for networks where many VLANs are configured and PCs in different VLANs need to communicate with each other.