I have FWSM with multi-context running on 6509. Vlan 8 is allocated to ContextC as Outside interface and it's down. However, on 6509 switch, interface Vlan 8 is up. No matter I did shut and no shut on the FWSM or switch, Vlan 8 on FWSM is down. I have no problem with other vlans allocated to other contexts.
If any one knows why, please don't hesitate to let me know immediately.