In a traditional VLAN, the VLAN represents an L3 broadcast domain or a subnet. EVLAN provides a discrete isolation of ports belonging to a traditional VLAN. Therefore, one host in an EVLAN can communicate with some of the hosts in the EVLAN, while the first host cannot communicate with other hosts even though they are in the same EVLAN and subnet.
An EVLAN consists of two types of EVLANs, principal and restricted.