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VLAN Aggregation
As shown in Figure 5-21, four VLANs, namely, VLAN 21, VLAN 22, VLAN 31, and VLAN 32, are configured. If these VLANs need to communicate with each other, you should configure an IP address for each VLAN on the Switch.
Alternatively, you can enable VLAN aggregation to aggregate VLAN 21 and VLAN 22 into super VLAN 2, and VLAN 31 and VLAN 32 into super VLAN 3. Therefore, you can save IP addresses by only assigning IP addresses to the super VLANs.
After Proxy ARP is configured on Switch, the sub-VLANs in each super VLAN can communicate with each other.