Trunking vlan on 6500-Help Please.

I have a good idea what's need to be done, but I need a little more
assurance.


Here is what I have a core 6500 with an MSFC that is trunking all the
vlans like a typical enviorment.


I have a 3550 switch that is connected to port 7/12 on the 6500. All I
want to do is trunk vlan 442 to the 3550 without causing any problems.

Here is the command that I am using set trunk 8/12 vlan 142 type

at this point I have not hit the enter button because I am afraid that
all of my
vlans will try and trunk over this.. and my orginal trunk will be
screwed up.I have a gut feeling I am going to have to use the clear
command...should I set that up first? Will I cause any problems.

.