If PVLAN are supported on 2960 platform and IOS, here is a sample:
vlan 90
private-vlan primary
private-vlan association 100
!
vlan 100
private-vlan isolated
!
interface FastEthernetx/y
switchport trunk encapsulation dot1q
switchport private-vlan trunk allowed vlan 100
switchport private-vlan association trunk 90 100
switchport mode private-vlan trunk
