aggregate-vlan
Function
The aggregate-vlan command configures a VLAN as a super-VLAN.
The undo aggregate-vlan command cancels the configuration.
By default, no VLAN is configured as a super-VLAN.
Usage Guidelines
Usage Scenario
The VLAN technology is widely applied to packet switching networks because it controls broadcast domains flexibly and is easy to deploy. Generally, a Layer 3 switch usually uses a Layer 3 logical interface in each VLAN to allow user hosts in different broadcast domains to communicate. This wastes IP addresses. The VLAN aggregation function is introduced to save IP addresses while implementing communication between VLANs.
The VLAN aggregation function associates a super-VLAN with multiple sub-VLANs. A VLANIF interface can be created in the super-VLAN and be configured with an IP address. Interfaces in all the sub-VLANs use this IP address as the gateway address to communicate with interfaces in other VLANs. This reduces subnet IDs, subnet default gateway addresses, and subnet broadcast IP addresses. In a word, the VLAN aggregation function allows different broadcast domains to use the same subnet address, implements flexible addressing, and saves IP addresses.
Prerequisites
Before configuring a VLAN as a super-VLAN, delete all physical interfaces from the VLAN.
Precautions
The aggregate-vlan command cannot be used simultaneously with the arp anti-attack check user-bind enable command for a VLAN.
The aggregate-vlan command cannot be used simultaneously with the ip source check user-bind enable command for a VLAN.
VLAN 1 cannot be configured as a super-VLAN.
If a VLAN has been configured as a guest VLAN, it cannot be configured as a super-VLAN.
The super-VLAN must be different from all its sub-VLANs.
After a VLAN is configured as a super-VLAN, no physical interface can be added to the VLAN.
The device supports 256 super-VLANs globally. The maximum amount of sub-VLANs supported in a super-VLAN is 24.
