Private VLAN

Example

vlan 200
  private-vlan primary
  private-vlan association 201,202
vlan 201
  private-vlan community
vlan 202
  private-vlan isolated

int e1/0
 switchport private-vlan mapping 200 201-202
 switchport mode private-vlan promiscuous
int range e0/0 -1
 switchport private-vlan host-association 200 201
 switchport mode private-vlan host
int range e0/2 -3
 switchport private-vlan host-association 200 202
 switchport mode private-vlan host