Vlanforward solution

By default, the vlanforward CLI command is enabled and will forward VLAN traffic to all VLANs on this interface. When disabled, each VLAN on this physical interface can send traffic only to the same VLAN. There is no cross-talk between VLANs, and ARP packets are forced to take one path along the network which prevents the multiple paths problem.

In the following example, vlanforward is disabled on port1. All VLANs configured on port1 will be separate and will not forward any traffic to each other.

config system interface

edit port1

set vlanforward disable

next

end