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 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
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.
If a VLAN or the VLAN pool to which a VLAN belongs has been configured as a service VLAN for the WLAN network, the VLAN cannot be configured as a super-VLAN. Similarly, if a VLAN has been configured as a super-VLAN, the VLAN or the VLAN pool to which the VLAN belongs cannot be configured as a service VLAN for the WLAN network. In addition, if a VLAN pool has been configured as a service VLAN for a WLAN network, a super-VLAN cannot be added to the VLAN pool.
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.
If too many sub-VLANs are added to the super-VLAN, the ARP broadcast storm degrades the system performance and affects the ARP learning.For S6730-H, S6730-S, S6730S-H, S6730S-S, S5731-H, S5731-S, S5731S-H, S5731S-S, S6720-HI, S5730-HI, S5720-HI, S5720-EI, and S5732-H, the number of sub-VLANs that are added to a super-VLAN cannot exceed 24. For other models, the number cannot exceed 16.