I have a 1841 router and a 2950 switch. I am doing the router on a stick configuration. On the 1841 I have configured sub interfaces Fa0/0.120 & Fa0/0.130. On the switch I created VLAN 120 & 130. When I issued the command "no shutdown" on the 120 VLAN the 130 VLAN shuts down and vice versa. I am not sure what is going on.