is a logical container that includes two or more distinct VLANs. VLAN
groups are intended for load balancing traffic in a Layer 2 network, when you want to minimize
the reconfiguration of hosts on that network. This figure shows an example of a VLAN group.
A VLAN group also ensures that the BIG-IP® system can process traffic
successfully between a client and server when the two hosts reside in the same address space.
Without a VLAN group, when the client and server both reside in the same address space, the
client request goes through the virtual server, but instead of sending its response back through
the virtual server, the server attempts to send its response directly to the client, bypassing
the virtual server altogether. As a result, the client cannot receive the response, because the
client expects the address of the response to be the virtual server IP address, not the server IP
You can configure the behavior of the BIG-IP system so that it always creates a proxy for any ARP requests between VLANs.
When you create a VLAN group, the two existing VLANs become child VLANs of the VLAN group.
VLAN groups reside in administrative partitions. To create a VLAN group, you must first set the current partition to the partition in which you want the VLAN group to reside.
Only users with the Administrator user role can create and manage VLAN groups.